GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Cobalt 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Traction Off Indicator Always On

Circuit Description

The Traction Off indicator is controlled by the instrument cluster via serial data messages from the electronic brake control module (EBCM). When the traction control system (TCS) is disabled, the EBCM commands the instrument cluster to turn ON the Traction Off indicator.

The Traction Off indicator will also turn ON during the instrument cluster bulb check. When the ignition switch is turned to ON, the Traction Off indicator will turn ON for approximately 3 seconds and then turn OFF.

Diagnostic Aids

The malfunction must be present during diagnosis in order to prevent unnecessary parts replacement. Always begin diagnosis with the Diagnostic System Check - Vehicle. Refer to Diagnostic System Check - Vehicle .

Test Description

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

  1. This step tests if the instrument panel cluster (IPC) is able to turn OFF the Traction Off indicator.

Step

Action

Yes

No

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views or Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gages, and Console

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Turn OFF the ignition for 5 seconds.
  2. Turn ON the ignition while observing the Traction Off indicator.

Does the Traction Off illuminate for 2 seconds and then turn OFF?

Go to Diagnostic Aids

Go to Step 3

3

  1. Install a scan tool.
  2. Select the Instrument Panel Cluster Special Functions menu on the scan tool.
  3. Command the instrument panel cluster (IPC) lamps OFF.

Does the Traction Off indicator turn OFF?

Go to Step 5

Go to Step 4

4

Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 6

--

5

Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 6

--

6
  1. Turn OFF the ignition for 5 seconds.
  2. Turn ON the ignition while observing the Traction Off indicator.

Does the Traction Off indicator illuminate for 2 seconds and then turn OFF?

System OK

Go to Step 3