91B1

91B1-MISSING/IMPLAUSIBLE BUSSED ZMZ HEADER DATA MESSAGE

Theory of Operation

When powered, the Occupant Restraint Controller (ORC) performs internal circuit and Bus communication tests. Active DTC's will be set if the ORC identifies internal circuit problems, missing or invalid Bus messages. The repair of this fault condition does not involve any external circuitry and centers on verifying the integrity of the module's internal circuitry and software validity

- When Monitored:
With the ignition ON, communication established with all modules, the ORC on board diagnostics continuously performs communication tests for valid message transmitted between modules.

- Set Condition:
This DTC will be set active if the ORC does not receive a valid Bus message containing the ZMZ Header Data Bus message.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. REPLACE THE ORC
NOTE: Ensure that the battery is fully charged.



Repair

WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take proper precautions could result in accidental airbag deployment and serious or fatal injury.

WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

- Replace the ORC.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests