Normal Operation and Fault Conditions
The RCM continuously monitors the passenger airbag module stage 1 circuits for the following faults:
- Resistance out of range
- Unexpected voltage
- Short to ground
- Faulted passenger airbag module
If a fault is detected, the RCM stores DTC B0010:11, B0010:12, B0010:13 or B0010:1A in memory and sends a message to the IPC to illuminate the airbag warning indicator.
The RCM analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM . If the value displayed is lower or higher than the desired range (refer to diagram, see Fig 1), the RCM can set a DTC . As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern. This test uses process of elimination to diagnose each part of the deployment loop circuit including:
- Wiring
- Connections
- Passenger airbag module
- RCM
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B0010:11 | Passenger Frontal Stage 1 Deployment Control: Circuit Short to Ground | A fault is indicated when the RCM senses a short to ground on either passenger airbag stage 1 circuit for more than 6 seconds. |
| B0010:12 | Passenger Frontal Stage 1 Deployment Control: Circuit Short to Battery | A fault is indicated when the RCM senses a short to voltage on either passenger airbag stage 1 circuit for more than 6 seconds. |
| B0010:13 | Passenger Frontal Stage 1 Deployment Control: Circuit Open | A fault is indicated when the RCM measures more than the desired resistance range between passenger airbag stage 1 circuits for more than 6 seconds. |
| B0010:1A | Passenger Frontal Stage 1 Deployment Control: Circuit Resistance Below Threshold | A fault is indicated when the RCM measures less than the desired resistance range between passenger airbag stage 1 circuits for more than 6 seconds. |