Circuit Description
The ignition 3 voltage circuit supplies 12 volts to the traction control switch. The electronic brake control module (EBCM) illuminates the low traction indicator by applying ground to the traction control active signal circuit.
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step verifies the ignition 3 voltage circuit can supply adequate power to the traction control switch.
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This step verifies the EBCM is applying ground to the low traction indicator.
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The EBCM may be damaged if the traction control active signal circuit is shorted to voltage.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 | Use the scan tool to command the Low Traction Lamp ON and OFF. Does the low traction indicator turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 8 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 6 | Go to Step 5 | |
Test the traction control active signal circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 7 | |
6 | Inspect for poor connections at the traction control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
7 | 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 11 | Go to Step 10 |
8 | Repair the open in the ignition 3 voltage circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 11 | -- |
9 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement . Did you complete the replacement? | Go to Step 11 | -- |
10 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | -- |
11 | Use the scan tool in order to command the Low Traction Lamp ON and OFF. Does the low traction indicator turn ON and OFF with each command? | System OK | Go to Step 3 |
