Circuit Description
The ABS indicator is controlled by the EBCM. The EBCM supplies the ground to ABS indicator control circuit in order to keep the indicator off. When ABS indicator control circuit looses ground at the EBCM, the ABS indicator turns on.
Diagnostic Aids
| • | 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 General Electrical Diagnosis in Wiring Systems for further diagnosis. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks for an internal EBCM malfunction.
-
This step checks for a short to ground in ABS indicator control circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views or Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gages, and Console | ||||
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | |
Does the ABS Indicator come on? | -- | Go to Step 3 | Go to Step 4 | |
3 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | Go to Step 9 | -- |
Is the resistance within the range specified in the value(s) column? | OL (infinite) | Go to Step 6 | Go to Step 5 | |
5 | Repair ABS indicator control circuit for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 9 | -- |
6 |
Is the ABS Indicator bulb OK? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the ABS Indicator Bulb. Refer to Instrument Cluster Indicator Lamp Replacement in Instrument Panel, Gages and Console. Is the replacement complete? | -- | Go to Step 9 | -- |
8 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console. Is the replacement complete? | -- | Go to Step 9 | -- |
9 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
