GM Service Manual Online
For 1990-2009 cars only

Object Number: 247781  Size: MF
ABS Components
Antilock Brake System Schematics
Handling ESD Sensitive Parts Notice

Circuit Description

This symptom table checks the state of the TCS (TRAC OFF)/ETS indicator to identify a situation in which the driver could not be warned of a system malfunction by the TCS (TRAC OFF)/ETS indicator, or the TCS (TRAC OFF)/ETS is always ON. The EBTCM sends a message to the electronic instrument panel cluster (IPC) via the Serial Data Line and the IPC will illuminate the indicator lamp(s).

Diagnostic Aids

The lamp test function of the scan tool may be used to command the indicator ON while looking for an intermittent malfunction in the TCS (TRAC OFF)ETS indicator.

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check

2

  1. Turn the ignition switch to the OFF position.
  2. Install a Scan Tool .
  3. Turn the ignition switch to the RUN position.
  4. Use the Scan Tool in order to select OUTPUT CONTROLS.
  5. Use the Scan Tool in order to select WOW CLUSTER.
  6. Use the Scan Tool in order to turn the amber TCS (TRAC OFF)ETS warning indicator on.

Did the amber TCS (TRAC OFF)/ETS indicator turn on?

--

Go to Step 4

Go to Step 3

3

Repair the instrument panel cluster.

Refer to Instrument Cluster, Cell 81, in Electrical Diagnosis.

Is the repair complete?

--

Go to Diagnostic System Check

--

4

The malfunction is not present at this time.

Is the repair complete?

--

Go to Diagnostic Aids

--