U0001

Anti-Lock Control

Pinpoint Test G: DTC U0001

Normal Operation

- DTC U0001 (Lost Communication With Restraints Control Module: No Sub Type Information)- a continuous memory DTC set by the ABS module if it does not receive yaw or other sensor messages from the Restraints Control Module (RCM) for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:

- Communication network concern

- RCM (Restraints Control Module)

- ABS module

PINPOINT TEST G : DTC U0001

G1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify that there is an observable symptom present.

Is an observable symptom present?

Yes
GO to G2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

G2 CHECK THE COMMUNICATION NETWORK

- Connect the scan tool.

- Ignition ON.

- Using a scan tool, carry out the Network Test.

Does the RCM (Restraints Control Module) pass the Network Test?

Yes
GO to G3.

No
REFER to Information Bus.

G3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND RCM (Restraints Control Module) MODULE SELF-TESTS

- Enter the following diagnostic mode on the scan tool: Self-Test- ABS Module.

- Enter the following diagnostic mode on the scan tool: Self-Test- RCM (Restraints Control Module).

Is DTC B1676 or DTCs B1317 or B1318 present?

Yes
For the ABS module DTC B1676, GO to Pinpoint Test B. Pinpoint Test B: DTC B1676

For the RCM (Restraints Control Module) DTCs B1317 or B1318, REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
GO to G4.

G4 RECHECK THE ABS MODULE DTCs

- Using a scan tool, clear the ABS module DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Repeat the ABS module self-test.

Is DTC U0151 still present?

Yes
GO to G5.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

G5 CHECK FOR DTCs U0151 OR U0151:00 SET IN OTHER MODULES

- Using the scan tool, clear all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Enter the following diagnostic mode on the scan tool: Self-Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is DTC U0151 or DTC U0151:00 set in more than one module?

Yes
INSTALL a new RCM (Restraints Control Module). TEST the system for normal operation. CLEAR the DTCs. REPEAT the ABS module self-test

No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.