For 1990-2009 cars

### Circuit Description

The Traction Off indicator is controlled by the instrument cluster via class 2 serial data messages from the electronic brake control module (EBCM). When the rear integration module (RIM) sees the traction control switch input grounded through the momentary traction control switch, it sends a serial data message to the EBCM that tells the EBCM that the traction control switch has been pressed. The EBCM then disables traction control and sends a serial data message to the instrument cluster to turn ON the Traction Off indicator on the instrument panel. Each time the ignition is cycled from OFF to ON, the traction control system is enabled.

### Test Description

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

1. Use the scan tool to check the normal state of the Traction Off control.

2. Ensures that the instrument cluster can operate the Traction Off indicator.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views , Master Electrical Component List
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the TCS Warning Indicator/Message parameter in the DRP/ABS/TCS data list.

Does the scan tool display Off?

Go to Step 3

Go to Step 10

3 |

1. Turn OFF the ignition.
2. Turn ON the ignition, with the engine OFF.
3. Observe the Traction Off indicator on the instrument panel cluster (IPC) during the bulb check.

Does the Traction Off indicator illuminate during the bulb check and then turn OFF?

Go to Step 4

Go to Step 11

4 |

1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the TCS On/Off Switch parameter in the Rear Integration Module data list.
5. Activate the traction control switch.

Does the TCS On/Off Switch parameter change state?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 5

5 |

1. Turn OFF the ignition.
2. Disconnect the traction control switch connector.
3. Connect a 3-amp fused jumper from the signal circuit of the traction control switch to the ground circuit of the traction control switch.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, observe the TCS Switch State parameter.

Does the scan tool display On?

Go to Step 9

Go to Step 6

6 | Test the signal circuit of the traction control switch for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 16 | Go to Step 7
7 | Test the ground circuit of the traction control switch for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 16 | Go to Step 8
8 | Inspect for poor connections at the harness connector of the rear integration module (RIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 16 | Go to Step 12
9 | Inspect for poor connections at the harness connector of 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 16 | Go to Step 13
10 | 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 16 | Go to Step 14
11 | Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 16 | Go to Step 15
12 | Replace the RIM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 16 | --
13 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement . Did you complete the replacement? | Go to Step 16 | --
14 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 16 | --
15 | Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 16 | --
16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2