GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2001 🢒 Grand Prix 🢒 Brakes 🢒 Antilock Brake System 🢒 ABS Indicator Always On

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 number(s) below refer to the step number(s) on the diagnostic table.

  1. This step checks for an internal EBCM malfunction.

    2.

  2. This step checks for an open in ABS indicator control circuit.

Step

Action

Value(s)

Yes

No

Schematic Reference: Antilock Brake System Schematics

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the EBCM connector C1.
  3. Install the Universal Pinout Box J 39700 using the cable adapter J 39700-530 to connector C1 only.
  4. Connect a fused jumper wire between terminals 16 and 15 of the Universal Pinout Box.
  5. Turn the ignition switch to the RUN position.

Does the ABS Indicator turn off?

--

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 7

--

4

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the Instrument Cluster connector C1. Refer to Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges and Console for connector pinout.
  3. Using the DMM, measure the resistance between terminals 16 of the Universal Pinout Box and the Instrument Cluster harness connector C1 terminal E.

Is the resistance within the range specified in the value(s) column?

0-5ohms

Go to Step 6

Go to Step 5

5

Repair the ABS indicator control circuit for an open or high resistance. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 7

--

6

Replace the Instrument Panel. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2