GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2007 🢒 Vibe - FWD 🢒 Brakes 🢒 Antilock Brake System 🢒 Low Traction Indicator Always On

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:

    • A short in the Low Trac indicator control circuit
    • A traction control switch malfunction
    • An internal EBCM malfunction

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

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step tests the Low Trac indicator control circuit for a short.

Step

Action

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

Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the EBCM connector.
  3. Turn ON the ignition.

Is the Low Trac indicator ON?

Go to Step 4

Go to Step 5

4

Test the Low Trac indicator control circuit for a short. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5
  1. Disconnect the traction control switch connector.
  2. Check the traction control switch for continuity.
  3. Operate the switch.

Does the continuity change as the switch is operated?

Go to Step 8

Go to Step 7

6

Replace the instrument panel cluster assembly. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

Go to Step 9

--

7

Replace the traction control switch.

Is the repair complete?

Go to Step 9

--

8

Replace the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Assembly Replacement .

Is the repair 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