FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10; rule 13]
TITLE: “A SEAT BELT RECEPTACLE LOCATING SYSTEM AND A METHOD
THEREOF”
Name and Address of the Applicant:
TATA MOTORS LIMITED of Bombay house, 24 Homi Mody Street, Hutatma Chowk, Mumbai
400 001, Maharashtra, INDIA.
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
Present disclosure, in general, relates to a field of automobiles. Particularly, but not exclusively, the present disclosure relates to a seat belt of a vehicle. Further, embodiments of the present disclosure discloses a system and a method for locating a seat belt receptacle in a vehicle for fastening.
BACKGROUND OF THE DISCLOSURE
Vehicles such as passenger vehicles and commercial vehicles include restraints such as seatbelts in various types and styles, which are intended to be worn by an occupant of each of the seats of the vehicle. In general seatbelts are designed to secure the occupant in a position within a respective seat in the event of an accident or other abrupt movements of the vehicle. The seatbelt typically includes a shoulder belt intended to be worn across the occupant's upper torso and a lap belt intended to be worn across the lap.
In order to wear the seat belt, the occupants draw the seat belt over the upper torso and over the lap and fasten a seat belt buckle into a seat belt receptacle. Upon fastening the seat belt buckle into the seat belt receptacle the seat belt securely accommodates the occupant within the seat and restricts movement of the occupant in the event of an accident or other abrupt movements of the vehicle. Typically, in order to fasten the seat belt buckle into the seat belt receptacle, occupants are required to locate the seat belt receptacle visually or by touch and feel and then fasten the seat belt buckle into the seat belt receptacle. However, in some instances, due to change in the vehicle driving conditions visibility within a cabin may be low or non-existent during low light conditions. Such visibility issues leads to difficulty in locating the seat belt receptacle for fastening the seat belt buckle. Further, such difficulties lead to inconvenience during driving, that leads to distraction to a driver which is undesired. Further, due to the difficulty in locating the seat belt receptacle, it is likely that the occupants refrain from wearing the seat belt which leads to fatal injuries to the occupants during accidents or other abrupt movements of the vehicle, which is undesired.
Present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the known arts.
SUMMARY OF THE DISCLOSURE
One or more shortcomings of the prior art are overcome by a system and a method as claimed and additional advantages are provided through the system and the method as claimed in the present

disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In one non-limiting embodiment of the present disclosure, a seat belt receptacle locating system for a vehicle is disclosed. The system includes a first sensor which is disposed proximal to a retractor assembly. The first sensor is configured to detect displacement of a seat belt in the retractor assembly. Further, the system includes a second sensor that is disposed in a seat belt receptacle adapted to receive a seat belt buckle of the seat belt, where the second sensor is configured to detect fastened condition and un-fastened condition of the seat belt with the seat belt receptacle. Furthermore, the system includes an indication unit which is provisioned in the seat belt receptacle which is configured to illuminate the seat belt receptacle. Additionally, the system includes a control unit which is communicatively coupled to the first sensor, the second sensor and the indication unit, and the control unit is configured to receive a first signal from the first sensor corresponding to the displacement of the seat belt from the retractor assembly. Further, the control unit is configured to activate the indication unit, based on the first signal to illuminate the seat belt receptacle for locating the seat belt receptacle.
In an embodiment, the first sensor is mounted on a pulley shaft of the retractor assembly.
In an embodiment, the indication unit is at least one of a visual indication unit and a vibration indication unit.
In an embodiment, the control unit is configured to receive, a second signal from the second sensor corresponding to a fastened condition of the seat belt with the seat belt receptacle and de-activate, the indication unit, based on the second signal.
In an embodiment, the control unit is configured to receive a third signal from the second sensor, which corresponds to un-fastened condition of the seat belt. Further, the control unit is configured to activate the indication unit based on the third signal. The control unit is further configured to deactivate the indication unit on receiving a fourth signal from the first sensor corresponding to displacement of the seat belt into the retractor assembly.
In another non-limiting embodiment of the present disclosure, a method for locating a seat belt receptacle in a vehicle is disclosed. The method includes receiving by a control unit, a first signal from a first sensor, corresponding to displacement of a seat belt from the retractor assembly. Further, the control unit is configured to activate an indication unit based on the first signal, for

illuminating the seat belt receptacle. The control unit is then configured to receive a second signal from a second sensor corresponding to a fastened condition of the seat belt with the seat belt receptacle. Furthermore, the control unit is then configured to de-activate the indication unit corresponding to the second signal.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristics of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiments when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
Fig. 1 illustrates a block diagram of a seat belt receptacle locating system, in accordance with an embodiment of the present disclosure.
Fig. 2 illustrates a schematic view of a seat belt and a retractor assembly where the seat belt is in an unfastened condition, in accordance with an embodiment of the present disclosure.
Fig. 3 illustrates a schematic view of the seat belt displaced from the retractor assembly, in accordance with an embodiment of the present disclosure.
Fig. 4 illustrates a schematic view of a seat belt buckle fastened into a seat belt receptacle, in accordance with an embodiment of the present disclosure.
Fig. 5 is a flow chart of a method for locating the seat belt receptacle in the vehicle, in accordance with an embodiment of the present disclosure.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the

system and method illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which forms the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that, the conception and specific embodiments disclosed may be readily utilized as a basis for modifying other devices, systems, methods, assemblies and mechanisms for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that, such equivalent constructions do not depart from the scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristics of the disclosure, to its device or system, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusions, such that a system or a device that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
In accordance with various embodiments of the present disclosure, a seat belt receptacle locating system for a vehicle is disclosed. The seat belt receptacle locating system may include a first sensor that may be disposed proximal to a retractor assembly. The first sensor may be configured to detect displacement of the seat from and into the retractor assembly. Further, the seat belt receptacle locating system may include a second sensor that may be disposed within a seat belt receptacle. The second sensor may be configured to detect fastened and un-fastened condition of a seat belt with the seat belt receptacle. Furthermore, the system may include an indication unit that may be provisioned in the seat belt receptacle and may be configured to illuminate or produce an illumination for illuminating the seat belt receptacle. Additionally, the seat belt receptacle locating system may include a control unit that may be communicatively coupled to the first sensor, the second sensor and the indication unit. The control unit may be configured to receive a first signal

that may be transmitted from the first sensor corresponding to the displacement of the seat belt from the retractor assembly. Further, the control unit may be configured to activate the indication unit, corresponding to the first signal for illuminating the seat belt receptacle which may provide sufficient visibility to an occupant for locating the receptacle and aid in fastening the seat belt within the receptacle.
Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible, same numerals have been used to refer to the same or like parts. The following paragraphs describe the present disclosure with reference to Figs. 1-5. It is to be noted that the seat belt receptacle locating system may be employed in any vehicle including but not limited to a passenger vehicle, a utility vehicle, commercial vehicles, and any other vehicle.
Fig. 1 is an exemplary embodiment of the present disclosure which illustrates a block diagram of a seat belt receptacle locating system (100) for a vehicle. The seat belt receptacle locating system (100) [hereafter referred to as system (100)] may be retrofittable to an already existing vehicle seat belt assembly and may be configured to illuminate an existing seat belt receptacle (4) of the seat belt assembly to enable easy locating of the seat belt receptacle (4). In an embodiment, the seat belt assembly may include a seat belt (1) wound around a retractor assembly (3) which may allow movement of the seat belt (1) during fastening and unfastening of the seat belt (1). The seat belt may retract from and into the retractor assembly (3). In an embodiment, the retractor assembly (3) may include a spring loaded pulley disposed over a pulley shaft [not shown in Figs]. The seat belt (1) may be adapted to be wound around the pulley such that the seat belt (1) may be extracted and retracted from and into the retractor assembly (3), based on requirement of the occupant. Further, the seat belt assembly may include a seat belt buckle (2) which may be disposed on the seat belt (1) and the seat belt buckle (2) [hereafter referred to as buckle (2)] may be adapted to be received by the seat belt receptacle (4) [hereafter referred to as receptacle (4)]. The buckle (2) when received within the receptacle (4) is adapted to be fastened within the receptacle (4) [as seen in Fig. 4] to facilitate wearing of the seat belt (1) by the occupant.
Referring again to Fig. 1 the system (100) may include a first sensor (5) that may be disposed proximal to the retractor assembly (3). In an embodiment, the first sensor (5) may be positioned on a support member extending from the retractor assembly (3). In another embodiment, the first sensor (5) may be mounted on the pulley shaft of the retractor assembly (3). The first sensor (5) may be configured to detect displacement of the seat from and into the retractor assembly (3). That is, the first sensor (5) may be configured to generate a first signal that may correspond to the displacement of the seat belt (1) from the retractor assembly (3) [as seen in Fig. 3] and may be

configured to generate a fourth signal which may correspond to displacement of the seat belt (1) into the retractor assembly (3) [as seen in Fig. 2].
Further, the system (100) may include a second sensor (6) that may be disposed within or on the receptacle (4). The second sensor (6) may be configured to detect fastening and un-fastening of the buckle (2) [thus, the seat belt (1)] with the receptacle (4). The second sensor (6) may be configured to generate a second signal that may correspond to a fastened condition of the seat belt
(1) with the receptacle (4) [as seen in Fig. 3]. Further, the second sensor (6) may be configured to
generate a third signal which may correspond to un-fastened condition of the seat belt (1) in the
receptacle (4). As apparent from Fig. 1, the system (100) may include an indication unit (7) that
may be provisioned in the receptacle (4) or may be disposed on the receptacle (4). In an
embodiment, the indication unit (7) may be at least one of a visual indication unit such as but not
limiting to LED, which may be configured to illuminate [as seen in Fig. 3], and a vibration
indication unit adapted to vibrate for locating the receptacle (4) thereby facilitating in locating the
receptacle (4).
In an embodiment, the first sensor (5) and the second sensor (6) may be at least one of but not limited to a proximity sensor, motion sensor, optical sensor, accelerometer, position sensor, potentiometer, a relay switch, a micro switch and the like.
In an embodiment, the first sensor (5) may be a potentiometer which may be connected to the seat belt (1) or the pulley and the pulley shaft of the retractor assembly (3). The potentiometer may be configured to transmit signals based on displacement of the seat belt (1) or the pulley shaft of the retractor assembly (3).
In an embodiment, the second sensor (6) may be a micro switch which may be provisioned within the receptacle (4). The micro switch may be configured to switch between an ON condition and an OFF condition corresponding to the fastened condition and the un-fastened condition of the buckle (2) with the receptacle (4). Further, the micro switch may be configured to transmit signals to the control unit (CU) based on the fastened condition and the un-fastened condition of the buckle
(2) within the receptacle (4).
Further, as seen in Fig. 1 and Figs. 2-4, the system (100) may include a control unit (CU) that may be communicatively coupled to the first sensor (5), the second sensor (6), and the indication unit (7). The control unit (CU) may be configured to selectively activate (thus, illuminate) the indication unit (7) based on signals generated by the first sensor (5) and the second sensor (6). In an embodiment, the control unit (CU) may be configured to receive the first signal generated by

the first sensor (5), which may correspond to displacement of the seat belt (1) from the retractor assembly (3). Further, the control unit (CU) may be configured to activate the indication unit (7), based on the first signal for illuminating the receptacle (4) which may provide sufficient visibility to an occupant for locating the receptacle (4) and aid in fastening the buckle (2) within the receptacle (4) [as seen in Fig. 3]. In an embodiment, the cabin of the vehicle may include multiple receptacles (4) positioned adjacent to each other (for example, rear seat of the vehicle), and the system (100) may be configured to activate the indication unit (7) associated with the corresponding receptacle (4) of the seat belt (1) being displaced and the indication unit (7) which may be associated with the remaining receptacles (4) in the cabin of the vehicle may not be illuminated. This may enable the occupant to locate the receptacle (4) which is associated with the seat belt (1) being displaced. Furthermore, the control unit (CU) may be configured to receive the second signal generated from the second sensor (6), which may correspond to the fastened condition of the seat belt (1) with the receptacle (4) and de-activate the indication unit (7) [as seen in Fig. 4]. In an embodiment the term “deactivate” may be inferred as off condition of the indication unit (7). Additionally, the control unit (CU) may be configured to receive the third signal from the second sensor (6), that may correspond to the un-fastened condition of the seat belt (1) and activate the indication unit (7) based on the third signal [as seen in Fig. 3]. In an embodiment, the control unit (CU) is configured to activate the indication unit (7) corresponding to the third signal. The control unit (CU) is further configured to deactivate the indication unit (7) on receiving the fourth signal from the first sensor (5), where the fourth signal may correspond to displacement of the seat belt (1) into the retractor assembly (3).
In an embodiment of the disclosure, the control unit (CU) may be a centralized control unit (108), or a dedicated control unit (CU). The control unit (CU) may also be associated with other control units including, but not limited to, a body control module (BCM), a central control module (CCM), a general electronic module (GEM), and the like. The control unit (CU) may be implemented by any computing systems that is utilized to implement the features of the present disclosure. In an embodiment, the control unit (CU) may include a receiving module (11) which may be configured to receive the signals transmitted by the first sensor (5) and the second sensor (6). Further, the control unit (CU) may include a processing module (12) which may include at least one data processor for executing program components for executing user or system generated requests. The processing module (12) may be a specialized processing module such as integrated system (bus) controllers, memory management control units, floating point units, graphics processing modules, digital signal processing modules, etc. The processing module (12) may include a microprocessor, such as AMD Athlon, Duron or Opteron, ARM’s application, embedded or secure processors, IBM PowerPC, Intel’s Core, Itanium, Xeon, Celeron or other line of processors, etc. The processing module (12) may be implemented using a mainframe, distributed processor, multi-core, parallel,

grid, or other architectures. Some embodiments may utilize embedded technologies like application-specific integrated circuits (ASICs), digital signal processors (DSPs), Field Programmable Gate Arrays (FPGAs), etc. Additionally, the processing module (12) may be configured to receive data or signals from the receiving module (11). Furthermore, the control unit (CU) may include the activation module (13) which may be configured to receive data or signals from the processing module (12) and transmit the received signals to the indication unit (7).
In some embodiments, the control unit (CU) may be disposed in communication with one or more memory devices (e.g., RAM, ROM etc.) via a storage interface. The storage interface may connect to memory devices including, without limitation, memory drives, removable disc drives, etc., employing connection protocols such as serial advanced technology attachment (SATA), integrated drive electronics (IDE), IEEE-1394, universal serial bus (USB), fiber channel, small computing system interface (SCSI), etc. The memory device may further include a drum, magnetic disc drive, magneto-optical drive, optical drive, redundant array of independent discs (RAID), solid-state memory devices, solid-state drives, etc. In an embodiment, the control unit (CU) and the memory unit may be configured to activate and de-activate the indication unit (7) based on predefined time intervals corresponding to the signals that me be received from the first sensor (5) and the second sensor (6).
Referring now to Fig. 5 which is an exemplary embodiment of the present disclosure illustrating a flow chart of a method for locating the seat belt receptacle (4) in the vehicle.
The order in which the method is described is not intended to be construed as a limitation, and any number of the described method blocks may be combined in any order to implement the method. Additionally, individual blocks may be deleted from the methods without departing from the scope of the subject matter described herein.
At block 501, the method may include, receiving the first signal by the control unit (CU) from the first sensor (5), which may correspond to the displacement of the seat belt (1) from the retractor assembly (3). Based on the first signal the control unit (CU) may be configured to activate the indication unit (7) for illuminating the receptacle (4) [as seen in block 502]. Further, at block 503, the control unit (CU) may be configured to receive the second signal from the second sensor (6), which may correspond to fastened condition of the buckle (2) (thus, the seat belt) with the receptacle (4). Based on the second signal, the control unit (CU) may deactivate the indication unit [as seen block 504].

Further, at block 505, the control unit (CU) may be configured to receive the third signal from the second sensor (6), which may correspond to un-fastened condition of the buckle (2) (thus, the seat belt) with the receptacle (4).
At block 506, the control unit (CU), on receiving the third signal, may activate the indication unit (7). Further, at block 507 the control unit (CU) on receiving the fourth signal from the first sensor (5), may deactivate the indication unit (7) which may correspond to the displacement of the seat belt (1) into the retractor assembly (3).
In an embodiment, the system (100) is simple in construction which results in low-cost manufacturing and easy maintenance. In an embodiment, the system (100) is configured to be retrofitted to a conventional seat belt assembly.
In an embodiment, the system (100) facilitates determining the location of the receptacle (4) when the visibility within the cabin of the vehicle is low or non-existent, thereby enabling easy fastening of the seat belt (1) by the occupant.
It should be imperative that the construction and configuration of the device, the system and any other elements or components described in the above detailed description should not be considered as a limitation with respect to the figures. Rather, variation to such structural configuration of the elements or components should be considered within the scope of the detailed description.
Equivalents:
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory

phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Referral Numerals:

Reference Number Description
100 System
1 Seat belt
2 Buckle
3 Retractor assembly
4 Receptacle
5 First sensor
6 Second sensor
7 Indication unit
11 Receiving module
12 Processing module
13 Activation module
CU Control unit

We Claim:
1. A seat belt receptacle locating system (100) for a vehicle, the system (100) comprising:
a first sensor (5) disposed proximal to a retractor assembly (3), the first sensor (5) is configured to detect displacement of a seat belt (1) in the retractor assembly (3);
a second sensor disposed in a seat belt receptacle (4), adapted to receive a seat belt buckle (2) of the seat belt (1), the second sensor is configured to detect fastened condition and un-fastened condition of the seat belt (1) with the seat belt receptacle (4);
an indication unit (7) provisioned in the seat belt receptacle (4) to illuminate the seat belt receptacle (4); and
a control unit (CU) communicatively coupled to the first sensor (5), the second sensor and the indication unit (7), wherein the control unit (CU) is configured to:
receive, a first signal from the first sensor (5) corresponding to the
displacement of the seat belt (1) from the retractor assembly (3); and
activate, the indication unit (7), based on the first signal to illuminate the
seat belt receptacle (4) for locating the seat belt receptacle (4).
2. The system (100) as claimed in claim 1, wherein the first sensor (5) is mounted on a pulley shaft of the retractor assembly (3).
3. The system (100) as claimed in claim 1, wherein the indication unit (7) is at least one of a visual indication unit and a vibration indication unit.
4. The system (100) as claimed in claim 1, wherein the control unit (CU) is configured to receive, a second signal from the second sensor (6) corresponding to a fastened condition of the seat belt buckle (2) with the seat belt receptacle (4) and de-activate, the indication unit (7), based on the second signal.
5. The system (100) as claimed in claim 1, wherein the control unit (CU) is configured to receive a third signal from the second sensor (6), corresponding to un-fastened condition of the seat belt buckle (2).
6. The system (100) as claimed in claim 5, wherein the control unit (CU) is configured to activate the indication unit (7) based on the third signal and deactivate the indication unit (7) on receiving a fourth signal from the first sensor (5), corresponding to displacement of the seat belt (1) into the retractor assembly (3).

7. A vehicle comprising a system (100) as claimed in claim 1.
8. A method for locating a seat belt receptacle (4) in a vehicle, the method comprising:
receiving, by a control unit (CU) a first signal from a first sensor (5),corresponding to displacement of a seat belt (1) from a retractor assembly (3);
activating, by the control unit (CU), an indication unit (7), based on the first signal for illuminating the seat belt receptacle (4);
receiving, by the control unit (CU), a second signal from a second sensor (6) corresponding to a fastened condition of the seat belt (1) with the seat belt receptacle (4); and
de-activating, by the control unit (CU), the indication unit (7) corresponding to the second signal.
9. The method as claimed in claim 8, wherein a third signal is received by the control unit (CU) from the second sensor (6), which corresponds to un-fastened condition of the seat belt (1).
10. The method as claimed in claim 8, wherein the indication unit (7) is activated by the control unit (CU) corresponding to the third signal and is deactivated on receiving a fourth signal from the first sensor (5) which corresponds to displacement of the seat belt (1) into the retractor assembly (3).