Normal Operation
The Restraints Control Module (RCM) measures the yaw rate and vehicle acceleration, then sends the signal through a secondary, dedicated Controller Area Network (CAN) bus to the ABS module. The ABS module uses this information for AdvanceTrac® system operation. The ABS module also compares this information to the information it receives from other sensors (brake pedal input, steering wheel rotation sensor, etc.) to determine how valid the information is and to determine if an instability event is about to occur and if intervention is necessary.
The RCM and the ABS module communicate along circuits VCA23 (BU/WH) and VCA24 (GN/OG). An open circuit or a short to power or ground on any one of these circuits will cause the ABS module to set a DTC. Also, if the RCM is not mounted in the correct position, the ABS module will set DTCs.
| DTC Description | Fault Trigger Condition | ||
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If the ABS module receives a message from the RCM that is out of the normal operating range or one that does not agree with other sensor information, the appropriate signal fault DTC will be set. | ||
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If conditions or DTCs exist during normal operation that prevents the AdvanceTrac® system from operating, DTC C1963 and/or C1975 will be set. This DTC is usually set due to the steering wheel rotation sensor or the RCM being damaged or installed incorrectly. | ||
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The RCM uses a dedicated communication bus to send information to the ABS module. If, during normal operation, the ABS module does not receive any information from the RCM for more than 250 milliseconds, DTC U0074, U0151 or U0452 will be set. | ||
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This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RCM
- ABS module