Pinpoint Test L: DTCs U0028:08 and U0028:88

Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)

Pinpoint Tests

Pinpoint Test L: DTCs U0028:08 and U0028:88

Normal Operation
The Restraints Control Module (RCM) supplies the stability/traction control system with the yaw rate, roll rate, lateral and longitudinal accelerometer over a dedicated Controller Area Network 2 (CAN2) bus. If the RCM (Restraints Control Module) detects a fault with comminutions with the ABS module or CAN2 (Controller Area Network 2) bus circuits, it will set DTC U0028:08 or U0028:88.
The RCM (Restraints Control Module) does not request the Instrument Panel Cluster (IPC) module to illuminate the air bag warning indicator if either DTC U0028:08 or U0028:88 is set. The air bag warning indicator will remain off if either of these DTCs are set.

- DTC U0028:08 (Vehicle Communication Bus A: Bus Signal / Message Failures)- When the RCM (Restraints Control Module) does not receive CAN2 (Controller Area Network 2) bus messages from the ABS module for 5 seconds, a fault will be indicated. An open CAN2 (Controller Area Network 2) circuit, incorrect installed ABS module or loss of power and/or ground to the ABS module can set this DTC.
- DTC U0028:88 (Vehicle Communication Bus A: Bus Off)- When the RCM (Restraints Control Module) detects the CAN2 (Controller Area Network 2) circuits are shorted to ground, shorted to voltage or shorted to each other, a fault will be indicated.
The ABS module may set similar DTCs, U0151 (Lost Communication With Restraints Control Module) and U0452 (Invalid Data Received From Restraints Control Module).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- RCM (Restraints Control Module)
- ABS module