GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Eldorado 🢒 Brakes 🢒 Antilock Brake System 🢒 Traction Off Message Always On

Object Number: 413329 Size: LF
ABS Components
ABS Description
Cell 44: Class 2, Stoplamp/BTSI Switch, and Traction Control Switch
Handling ESD Sensitive Parts Notice
Cell 14: G205

Circuit Description

The TRACTION OFF message is controlled by the EBTCM. When the EBTCM sees the Traction Control Switch Input grounded through the momentary traction control switch, it disables Traction Control and sends a class 2 serial data message to the instrument cluster (IPC) to turn the TRACTION OFF message on. Each time the ignition switch is cycled OFF to ON, Traction Control is enabled.

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.
    • An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
    • If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Test Description

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

  1. Checks the state of the traction control switch.

    2.

  2. Checks the traction control switch and circuit for a short to ground.

    3.

  3. Checks the instrument cluster for the ability to operate the TRACTION OFF message. The EBTCM sends a serial data class 2 message to the instrument cluster. This test is done to see if the EBTCM can not send the message or the instrument cluster can not receive the message and act on the message properly.

Step

Action

Value(s)

Yes

No

1

Did you perform the ABS Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2

  1. Turn OFF the ignition.
  2. Connect a scan tool to the data link connector (DLC).
  3. Turn ON the ignition, with the engine OFF.
  4. Use the scan tool in order to select the ABS/TCS/ICCS Data List 2.
  5. Monitor the TCS On/Off Switch parameter.
  6. Press and then release the traction control switch.

Does the scan tool display indicate the parameter changes status?

--

Go to Step 3

Go to Step 4

3

  1. Use the scan tool in order to select the ABS/TCS/ICCS Data List 2.
  2. Observe the Traction Off Message Command parameter.
  3. Press and then release the traction control switch.

Does the scan tool display indicate the parameter changes status?

--

Go to Step 7

Go to Step 8

4

  1. Disconnect the traction control switch connector.
  2. Use the scan tool in order to select the ABS/TCS/ICCS Data List 2.
  3. Observe the TCS On/Off Switch parameter.

Does the scan tool display indicate the parameter is Off?

--

Go to Step 6

Go to Step 5

5

Repair the short to ground in CKT 1571. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

6

Replace the traction control switch. Refer to Instrument Panel Storage Compartment Replacement in Instrument Panel, Gauges and Console.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

7

Suspect the instrument cluster. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

8

Replace the EBTCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--