GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 Savana 🢒 Brakes 🢒 Antilock Brake System 🢒 ABS Indicator Inoperative

Circuit Description

The instrument panel cluster (IPC) illuminates the ABS indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends class 2 serial data messages to the IPC in order to command the indicator ON or OFF.

Diagnostic Aids

Replace the IPC if the ABS indicator intermittently fails to operate during the 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 the bulb check.

Step

Action

Yes

No

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 ABS indicator.

Does the ABS indicator illuminate?

Go to Diagnostic Aids

Go to Step 3

3

Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 4

--

4
  1. Turn OFF the ignition for 5 seconds.
  2. Turn ON the ignition while observing the ABS indicator.

Does the ABS indicator illuminate?

System OK

Go to Step 3