GM Service Manual Online
For 1990-2009 cars only

ABS Indicator Inoperative 310 ABS

Circuit Description

The Instrument Panel Cluster (IPC) commands the ABS Indicator on at bulb check until the IPC receives a class 2 serial data message from the EBCM commanding the ABS indicator off. If the EBCM sets a DTC(s), the EBCM may send a class 2 serial data message to the IPC commanding the ABS indicator on.

Diagnostic Aids

Replace the Instrument Panel Cluster if it is verified that the ABS indicator intermittently fails to operate during the IPC bulb check.

Test Description

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

  1. This step tests if the IPC is able to illuminate the ABS indicator during bulb check.

Step

Action

Value(s)

Yes

No

1

Did you perform the ABS Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check

2

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

Does the ABS indicator illuminate?

--

Go to Diagnostic Aids

Go to Step 3

3

Replace the Instrument Panel Cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console.

Did you complete the replacement?

--

System OK

--

ABS Indicator Inoperative 325 ABS

Circuit Description

The Instrument Panel Cluster (IPC) commands the ABS Indicator on at bulb check until the IPC receives a class 2 serial data message from the EBCM commanding the ABS indicator off. If the EBCM sets a DTC(s), the EBCM may send a class 2 serial data message to the IPC commanding the ABS indicator on.

Diagnostic Aids

Replace the Instrument Panel Cluster if it is verified that the ABS indicator intermittently fails to operate during the IPC bulb check.

Test Description

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

  1. This step tests if the IPC is able to illuminate the ABS indicator during bulb check.

Step

Action

Value(s)

Yes

No

1

Did you perform the ABS Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check

2

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

Does the ABS indicator illuminate?

--

Go to Diagnostic Aids

Go to Step 3

3

Replace the Instrument Panel Cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console.

Did you complete the replacement?

--

System OK

--