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 ABS warning indicator to identify a situation in which the driver could not be warned of a system malfunction by the ABS warning indicator, or the ABS warning indicator is always ON. The EBCM/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 ABS warning 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 LAMP TEST.
  6. Use the Scan Tool in order to WOW CLUSTER.

Did the amber ABS warning 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

--