B0128-11
B0128-11-FRONT PASSENGER BUCKLE SWITCH - CIRCUIT SHORT TO GROUND
Special Tools:
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
When powered, the Occupant Restraint Controller (ORC) sends a test current across the Passenger Seat Belt Buckle Switch circuits to verify the integrity of the switch and wiring. The front seat belt switches cannot be adjusted or repaired and, if ineffective or damaged, the entire front seat belt buckle-half unit must be replaced. The seatbelt reminder lamp will display in the instrument cluster for this fault. The ORC obtains the buckle switch status of the driver and front passenger, as well as the status of the front passenger seat occupant detection mat. If the driver or front passenger is unbelted, the ORC sends a message to the IPC over the CAN-B bus to turn on the seatbelt reminder light. The light remains on until the front seatbelts are fastened. An audible alert triggers within 60 seconds of vehicle speed over 5 mph. The seatbelt reminder light remains illuminated until the front belts are fastened. The seatbelt buckle switch consists of a Hall-effect sensor assembly. The ORC determines the status of the seatbelt (buckled/unbuckled) based on the amount of current drawn by the sensor. When the seatbelt is unbuckled, the sensor draws a current of approximately 6.5 mA. When the seat is buckled, the sensor draws a current of approximately 15 mA.
- When Monitored:
When powered, the Occupant Restraint Controller (ORC) sends a test current to the belt switches to verify the integrity of the switch and wiring. The use of the SRS Load Tool Adapter tool in the tests below provides a test point in place of the module.
- Set Condition:
The ORC monitors the status of the seat belt switch circuits at power up and every 60 ms thereafter while the ignition is in on.
This DTC sets when the ORC detects the seat belt switch circuits have become shorted to ground for more than 2.5 seconds. This DTC transitions from active to stored when the module sees a recovery from the shorted to ground condition for greater than five seconds.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure.
1. VERIFY ACTIVE DTC
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read the ORC DTCs.
Does the scan tool display active B0128-11-FRONT PASSENGER BUCKLE SWITCH - CIRCUIT SHORT TO GROUND DTC?
Yes
- Go To 2
No
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Condition Test.
2. PASSENGER SEAT BELT SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the Passenger Seat Belt Switch harness connector.
2. Disconnect the ORC harness connectors.
NOTE: Check harness connectors - Clean and repair as necessary.
NOTE: After disconnecting the ORC module and the ORC module body harness connector, check the ORC module body harness connector shorting bar pin location. The shorting bar pin location should be down and not visible through the larger center holes of the ORC module body harness connector.
3. Connect the SRS Load Tool 56 Way ACM Adapter (8443-25) to the ORC harness connectors.
4. Measure the resistance of the (R58) Passenger Seat Belt Switch Signal circuit between the appropriate terminal of the SRS Load Tool 56 Way ACM Adapter (8443-25)and ground.
Is the resistance below 10.0 Ohms?
Yes
- Repair or replace the (R58) Passenger Seat Belt Switch Signal circuit for a short to ground.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 3
3. PASSENGER SEAT BELT SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
1. Replace the Passenger Seat Belt Switch. Procedures.
2. Disconnect the SRS Load Tool 56 Way ACM Adapter (8443-25).
3. Reconnect the ORC harness connectors.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
4. With the scan tool, read all active ORC DTCs.
Does the scan tool display active B0128-11-FRONT PASSENGER BUCKLE SWITCH - CIRCUIT SHORT TO GROUND DTC?
Yes
- WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
- WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to follow these instructions may result in possible serious or fatal injury.
- Replace the ORC. Occupant Restraint Controller - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- The repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.