For 1990-2009 cars
ABS Components
Antilock Brake System Schematics
Instrument Cluster: Analog Schematics
Data Link Connector Schematics
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice

### Circuit Description

The SERVICE TRACTION SYSTEM message is controlled by the EBCM. The SERVICE TRACTION SYSTEM message is activated (turned On) whenever a traction control fault occurs. When the EBCM detects that a fault exists in the traction control system, it turns on the SERVICE TRACTION SYSTEM message by sending a Class 2 message to the IPC.

### 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 Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

#### SERVICE TRACTION SYSTEM message always On with No DTC set

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: SERVICE TRACTION SYSTEM message does not turn off after the Instrument Panel Cluster (IPC) bulb check and no ABS/TCS DTC(s) are set.
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Disconnect the EBCM connector.
2. Turn ON the ignition, with the engine OFF.

Does the instrument panel still show the warning message SERVICE TRACTION SYSTEM?

--

Go to Step 4

Go to Step 3

3 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement Did you complete the repair? | -- | Go to Step 5 | --
4 | Replace the Instrument Panel. Refer to Instrument Panel Assembly Replacement Did you complete the repair? | -- | Go to Step 5 | --
5 |

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