Diagnostic Routine N

Diagnostic Routine N

Diagnostic Overview

U0121:00

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions







Pinpoint Test

1. VERIFY THE CUSTOMER CONCERN

1. Ignition ON.

2. Verify there is an observable symptom present.

Is an observable symptom present?








2. CHECK THE COMMUNICATION NETWORK

1. Using a scan tool, perform network test.

Does the ABS (Anti-Lock Brake System) module pass the network test?








3. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE BCM (Body Control Module) SELF-TEST

1. Using a scan tool, perform BCM (Body Control Module) self-test.

2. Check for recorded BCM (Body Control Module) DTCs (Diagnostic Trouble Codes) from the self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 or DTC (Diagnostic Trouble Code) U3003:17 recorded?








4. CHECK FOR DTCs (Diagnostic Trouble Codes) U3003:16 AND U3003:17 FROM THE ABS (Anti-Lock Brake System) MODULE SELF-TEST

1. Using a scan tool, retrieve the continuous memory DTCs (Diagnostic Trouble Codes) from the ABS (Anti-Lock Brake System) module.

Is DTC (Diagnostic Trouble Code) U3003:16 or DTC (Diagnostic Trouble Code) U3003:17 recorded?








5. RECHECK THE BCM DTCs (Diagnostic Trouble Codes)

1. NOTE: If new modules were installed prior to the DTC (Diagnostic Trouble Code) being set, the module configuration may be incorrectly set during PMI (Programmable Module Installation) or the PMI (Programmable Module Installation) may not have been carried out.

Using a scan tool, clear the DTCs (Diagnostic Trouble Codes). Repeat the BCM (Body Control Module) self-test.

Is DTC (Diagnostic Trouble Code) U0121:00 still present?








6. CHECK FOR DTC (Diagnostic Trouble Code) U0121:00 SET IN OTHER MODULES

1. Clear the DTCs (Diagnostic Trouble Codes).

2. Ignition OFF.

3. Ignition ON.

4. Wait 10 seconds.

5. Using a scan tool, retrieve the continuous memory DTCs (Diagnostic Trouble Codes) from all modules.

Is DTC (Diagnostic Trouble Code) U0121:00 set in any other module?