Normal Operation

The Restraints Control Module (RCM) measures vehicle yaw rate and lateral acceleration and 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 yaw rate sensor lateral accelerometer are contained in the RCM.

• DTC U1A00:49 (Private Communication Network: Internal Electronic Failure) - sets in continuous memory when there is a communication issue between the ABS module and the RCM.
• DTC U1A00:87 (Private Communication Network: Missing Message) - sets in continuous memory when expected messages such as yaw rate sensor and lateral accelerometer are missing for more than 5 seconds.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals, or connectors
• RCM
• ABS module