Lost Communication with Restraints Occupant Sensing Module
The Restraints Occupant Sensing Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Occupant detection is lost, so airbag suppression and staging may be wrong. Safety-critical. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Affected components
- Occupant sensing module
- Can bus wiring
Common causes
- High likelihood: Occupant sensing module unpowered
- Medium likelihood: Seat harness damaged under the seat
- Low likelihood: Gateway module routing CAN messages incorrectly
Possible symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.