Diagnostics and testing of the seat belt system (Discovery 3)

Safety information

WARNING: To prevent accidental operation, the standby power source must be disconnected from power before any work is done on the SRS or any of its components. Failure to follow this instruction may result in injury.

CAUTION: Do not use a multimeter to test the SRS module. There is a possibility that the meter's battery triggers the module. Failure to follow this instruction may result in injury.

NOTE: It is recommended that you do not use or keep a cellular phone near you while operating the SRS or any of its components.

Power failure

Before starting any work on the SRS system or related components:

1. Remove the ignition key.

2. Disconnect the battery wires, starting with the ground wire.

3. Wait 2 minutes for the main circuit to discharge.

Full instructions on the correct SRS system repair procedures can be found in the manual:

Inspection and verification

1. Check the validity of the customer's complaint.

2. Visually inspect for obvious mechanical and electrical problems.

Mechanical elements	Electrical Factors
Check for any non-standard accessories installed that may affect or interfere with the operation of the SRS system. Worn or damaged tape Locks/rods, etc. drums Sensor (And) Pretensioner (And)	Fuses Battery Electrical Junction Box (BJB) - fuse 11E Central electrical junction box (CJB) - fuse 9P Central electrical box (CJB) - fuse 68P Wiring harness Control (s) lamp (s) Sensor (And) clashes Sensor (And) seat belt buckle Pretensioner (And) Secondary restraint system control module (RCM)

3. If an obvious cause of a problem you identified or described by the customer is found, correct it before proceeding to the next steps (if possible).


Malfunctioning SRS wiring harnesses usually entail replacing the corresponding harness. It is not recommended to repair the SRS wiring harness

4. Use an approved diagnostic system or scan tool (tester), to retrieve all DTCs before accessing the Dynamic Tests or DTC Index (DTC).

Clear all DTCs after troubleshooting.

Dynamic checks

Each of the following two procedures can be used to verify that the seat belts are working properly. Both methods require the participation of two people, but remember that large people should not be involved in these checks. This is necessary so that full unwinding of the seat belt webbing is not mistaken for proper locking provided by the seat belt retractor mechanism.

1st way to check (braking)

• At a steady speed, the passenger should attempt to slowly pull the seat belt webbing out of each seat belt retractor in sequence. It is not possible to pull out the tape if the vehicle movement-sensing locking mechanism is working correctly.
• Do not use any seat belt retractor that allows the belt to be pulled out during this test. A new seat belt should be installed.

Checking the Seat Belt Sensor

With the vehicle stationary on a level surface, firmly grasp the seat belt webbing (on the side of the tongue of the upper element of the seat belt anchorage) and quickly pull the tape out. The retractor should lock at 0.25 meters, preventing further tape retraction. Do not use any retractor mechanism that allows the belt to be pulled out further. A new seat belt should be installed.

DTC index

NOTE: Universal Scan Tools cannot read the listed codes or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7 digit code to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).

DTC	Description	Possible reasons	Action
B005011	Driver seat belt sensor	Seat belt sensor circuit short to ground	Check for steering wheel angle sensor DTCs. Check the seat belt buckle wiring for signs of damage. Refer to the electrical manual and check the seat belt sensor circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B005015	Driver seat belt sensor	Seat belt sensor circuit short circuit to battery Seat belt sensor circuit high resistance	Check for steering wheel angle sensor DTCs. Check the seat belt buckle wiring for signs of damage. Refer to the electrical manual and check the seat belt sensor circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B00501D	Driver seat belt sensor	Seat belt sensor circuit current out of range	Check for steering wheel angle sensor DTCs. Check the seat belt buckle wiring for signs of damage. Refer to the electrical manual and check the seat belt sensor circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B005064	Driver seat belt sensor	Seat Belt Sensor No Plausibility Possible Configuration Error (output disabled but device installed)	Check for steering wheel angle sensor DTCs. Check the seat belt buckle wiring for signs of damage. Refer to the electrical manual and check the seat belt sensor circuit. Configure the module using an approved diagnostic system. Refer to the guided diagnostic program for this code on the approved diagnostic system.
B007011	Driver's seat belt pretensioner activation control	Trip control circuit - short to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B007012	Driver's seat belt pretensioner activation control	Trip control circuit short to battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B00701A	Driver's seat belt pretensioner activation control	Trip Control Circuit - Circuit Resistance Below Threshold	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B00701B	Driver's seat belt pretensioner activation control	Trip Control Circuit - Circuit Resistance Above Threshold	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B007064	Driver's seat belt pretensioner activation control	Operation control: no signal plausibility	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B007211	Passenger A Pretensioner Deployment Control	Trip control circuit - short to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B007212	Passenger A Pretensioner Deployment Control	Trip control circuit short to battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B00721A	Passenger A Pretensioner Deployment Control	Trip Control Circuit - Circuit Resistance Below Threshold	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B00721B	Passenger A Pretensioner Deployment Control	Trip Control Circuit - Circuit Resistance Above Threshold	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B007264	Passenger A Pretensioner Deployment Control	Operation control: no signal plausibility	Refer to the guided diagnostic program for this code on the approved diagnostic system.
B009011	Left front auxiliary restraint system sensor	Crash sensor circuit short circuit to ground	Check crash sensor and circuits. Refer to the electrical manual.
B009012	Left front auxiliary restraint system sensor	Crash sensor circuit short circuit to + battery	Check crash sensor and circuits. Refer to the electrical manual.
B009064	Left front auxiliary restraint system sensor	Collision sensor: no signal plausibility Possible configuration error	Check crash sensor and circuits. Refer to the electrical manual. Configure the module using an approved diagnostic system.
B009081	Left front auxiliary restraint system sensor	Invalid serial data received. Possibly high resistance	Check crash sensor and circuits. Refer to the electrical manual.
B009092	Left front auxiliary restraint system sensor	Collision sensor: performance problems or incorrect operation	Check crash sensor and circuits. Refer to the electrical manual.
B009096	Left front auxiliary restraint system sensor	Collision sensor internal element failure	Check crash sensor and circuits. Refer to the electrical manual.
B009511	Right front auxiliary restraint system sensor	Crash sensor circuit short circuit to ground	Check crash sensor and circuits. Refer to the electrical manual.
B009512	Right front auxiliary restraint system sensor	Crash sensor circuit short circuit to + battery	Check crash sensor and circuits. Refer to the electrical manual.
B009564	Right front auxiliary restraint system sensor	Collision sensor: no signal plausibility Possible configuration error (output disabled but device installed)	Check crash sensor and circuits. Refer to the electrical manual. Configure the module using an approved diagnostic system.
B009581	Right front auxiliary restraint system sensor	Invalid serial data received Possibly high resistance	Check crash sensor and circuits. Refer to the electrical manual.
B009592	Right front auxiliary restraint system sensor	Collision sensor: performance problems or incorrect operation	Check crash sensor and circuits. Refer to the electrical manual.
B009596	Right front auxiliary restraint system sensor	Collision sensor internal element failure	Check crash sensor and circuits. Refer to the electrical manual.
B1A2595	Driver seat belt pretensioner igniter circuit - short circuit to ignition circuit	Pretensioner igniter circuit short circuit to ignition Pretensioner igniter: incorrect assembly	Check pretensioner igniter and circuits. Refer to the electrical manual.
B1A2795	Driver seat belt pretensioner igniter circuit - short circuit to ignition circuit	Pretensioner igniter circuit short circuit to ignition Pretensioner igniter: incorrect assembly	Check pretensioner igniter and circuits. Refer to the electrical manual.