GM Service Manual Online
For 1990-2009 cars only

DTC C0283 W/JL4

Circuit Description

The traction control switch is a momentary-contact, normally-open switch that can be used to disable the engine torque management function of the traction control system (TCS). On 2-wheel drive or all wheel drive vehicles, the traction control switch is directly monitored by the electronic brake control module (EBCM). On 4-wheel drive vehicles equipped with selectable 4 LO, the traction control switch is monitored by the transfer case shift control module (TCSCM), which sends the traction control switch status information to the EBCM on the serial data link. Each time the traction control switch is pressed, the vehicle stability enhancement system (VSES) and TCS enabled/disabled status changes. When TCS is disabled, the EBCM sends serial data messages to the instrument panel cluster (IPC) to turn ON the traction OFF indicator and display the stability system disabled message.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0283 Mode Switch Circuit Malfunction

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

Two Wheel Drive or All Wheel Drive Vehicles

The EBCM detects low voltage on the traction control switch signal circuit for 8 seconds.

Four Wheel Drive Vehicles with Selectable 4 LO

The EBCM receives a serial data message from the TCSCM indicating that the VSES mode/transfer case shift control switch is detected as failed. The TCSCM sends this message 60 seconds after the TCSCM sets DTC B2725.

Action Taken When the DTC Sets

    • The EBCM disables VSES and engine torque management.
    • The traction OFF indicator turns ON.
    • The message center displays the service stability system message.

Conditions for Clearing the DTC

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

    •  Testing for Electrical Intermittents .
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs
    •  Connector Repairs

Test Description

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

  1. This step tests the traction control switch circuitry. If the fuse opens when you perform this test, the traction control switch signal circuit is shorted to ground.

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

  1. Use a scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition for up to 20 seconds.

Does the DTC set?

Go to Step 3

Go to Diagnostic Aids

3

  1. Turn OFF the ignition.
  2. Disconnect the traction control switch harness connector. Refer to Electronic Traction Control Switch Replacement .
  3. Turn ON the ignition.
  4. Connect a test lamp between the ignition 3 voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

4

  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition.
  3. Connect a fused jumper wire between the ignition 3 voltage circuit and the traction control switch signal circuit at the traction control switch harness connector.
  4. Turn ON the ignition for up to 20 seconds.

Does the DTC set?

Go to Step 5

Go to Step 9

5

Test the traction control switch signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

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 7

7

Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 11

--

8

Repair the open in the ignition 3 voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 11

--

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 11

Go to Step 10

10

Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement .

Did you complete the replacement?

Go to Step 11

--

11

  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

Go to Step 3

System OK

DTC C0283 W/O JL4

Circuit Description

The traction control switch is a momentary-contact, normally-open switch that can be used to disable the traction control system (TCS). Each time the traction control switch is pressed, the TCS enabled/disabled status changes. When TCS is disabled, the electronic brake control module (EBCM) illuminates the traction off indicator by opening the service traction control signal circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0283 Mode Switch Circuit Malfunction

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The EBCM detects low voltage on the traction control switch signal circuit for 10 seconds.

Action Taken When the DTC Sets

If equipped, the following actions occur:

    • The EBCM disables the TCS.
    • The traction off indicator turns ON.

Conditions for Clearing the DTC

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

    •  Testing for Electrical Intermittents
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs
    •  Connector Repairs

Test Description

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

  1. This step tests the traction control switch circuitry. If the fuse opens when you perform this test, the traction control switch signal circuit is shorted to ground.

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

  1. Use a scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Start the engine and allow the engine to run for at least 20 seconds.

Does the DTC set?

Go to Step 3

Go to Diagnostic Aids

3

  1. Turn OFF the ignition.
  2. Disconnect the traction control switch harness connector. Refer to Electronic Traction Control Switch Replacement .
  3. Turn ON the ignition.
  4. Connect a test lamp between the ignition 1 voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

4

  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition.
  3. Connect a fused jumper wire between the ignition 1 voltage circuit and the traction control switch signal circuit at the traction control switch harness connector.
  4. Start the engine and allow the engine to run for at least 20 seconds.

Does the DTC set?

Go to Step 5

Go to Step 9

5

Test the traction control switch signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

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 7

7

Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 11

--

8

Repair the open in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 11

--

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 11

Go to Step 10

10

Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement .

Did you complete the replacement?

Go to Step 11

--

11

  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 3

System OK