GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2006 🢒 GTO 🢒 Brakes 🢒 Antilock Brake System 🢒 Low Traction Indicator Inoperative

Circuit Description

The electronic brake control module (EBCM) turns ON the Low Trac indicator by grounding the EBCM Low Trac indicator control circuit. When the EBCM detects that the traction control system is activated, the Low Trac indicator will illuminate.

Diagnostic Aids

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:

    • An open or high resistance in the Low Trac indicator control circuit
    • An open, high resistance or short to ground in the instrument panel cluster (IPC) ignition voltage circuit
    • An open or high resistance in the EBCM ground circuits
    • An internal EBCM malfunction
    • An internal IPC malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the EBCM Low Trac warning lamp circuit for an open or high resistance.

    2.

  2. This step tests the IPC ignition voltage circuit for an open, high resistance or short to ground.

    3.

  3. This step tests the EBCM ground circuits.

Step

Action

Value(s)

Yes

No

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Turn ON the ignition and observe the Multi Function Display.

Does the Multi Function Display indicate "System OK"?

--

Go to Diagnostic Aids

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM) electrical connector.
  3. Turn ON the ignition, with the engine OFF.

Is the Low Trac indicator ON?

--

Go to Step 8

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the instrument panel cluster (IPC) harness connector.
  3. Measure the voltage between the ignition voltage circuits of the IPC and ground. Refer to Circuit Testing .

Does the voltage measure as specified?

Battery Voltage

Go to Step 5

Go to Step 6

5

Test the EBCM Low Trac circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 11

Go to Step 7

6

Test the IPC ignition voltage circuit for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 11

Go to Step 8

7

Test the EBCM ground circuits for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 11

8

Locate and repair open, high resistance or short to ground in the ignition control relay circuits. Refer to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

--

9

Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 10

10

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the replacement?

--

Go to Step 12

--

11

Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

--

Go to Step 12

--

12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK