U0028:88

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

Refer to Wiring Diagram Set 46 for schematic and connector information. [1][2]Diagrams By Number





Pinpoint Test - Supplemental Restraint System (SRS)

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

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. [1][2]Diagrams By Number

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 communications 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) to illuminate the air bag warning indicator if either DTC U0028:08 or U0028:88 is 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, incorrectly 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.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RCM (Restraints Control Module)
- ABS module