Normal Operation

The yaw rate sensor, lateral and longitudinal accelerometers are contained in the Restraints Control Module (RCM). The RCM measures vehicle yaw rate, roll rate, lateral and longitudinal acceleration and then sends the information to the ABS module along a dedicated Controller Area Network (CAN). This dedicated CAN is used only for communication between the RCM and the ABS module. The information sent to the ABS module is used to help determine if the AdvanceTrac® system needs to be activated.

• DTC U1A00:49 (Private Communication Network: Internal Electronic Failure) - this DTC sets in continuous memory and on demand when there is a communication issue between the ABS module and the RCM.
• DTC U1A00:87 (Private Communication Network: Missing Message) - this DTC sets in continuous memory and on demand when expected messages such as yaw rate sensor, lateral accelerometer and longitudinal accelerometer missing for more than 5 seconds.
• DTC U1A00:88 (Private Communication Network: Bus Off) - this DTC sets in continuous memory and on demand when the communication bus is down between the ABS module and the RCM and they are unable to communicate.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• RCM
• ABS module