The instrument panel cluster (IPC) turns the ABS indicator on during the IPC bulb check for approximately 3 seconds when the ignition switch is turned to the ON position. If the electronic brake control module (EBCM) sets a diagnostic trouble code (DTC) the EBCM sends a class 2 message to the body control module (BCM) and the BCM sends a class 2 message to the IPC to command the ABS indicator on.
• | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
• | Thoroughly inspect any circuitry that may be causing the complaint for the following conditions: |
- | Backed out terminals |
- | Improper mating |
- | Broken locks |
- | Improperly formed or damaged terminals |
- | Poor terminal-to-wiring connections |
- | Physical damage to the wiring harness |
• | The following conditions may cause an intermittent malfunction: |
- | A poor connection |
- | Rubbed-through wire insulation |
- | A broken wire inside the insulation |
• | If an intermittent malfunction exists refer to Inducing Intermittent Fault Conditions in Wiring Systems. |
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Computer/Integrating Systems Connector End Views in Computer/Integrating Systems or Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gages, and Console | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
All indicators will turn ON when commanded on. Does the ABS Indicator turn ON then OFF? | Go to Step 3 | Go to Step 4 | |
3 | Replace the ABS module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the replacement complete? | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | -- |
Is the instrument cluster replacement complete? | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | -- |