GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Eighty Eight 🢒 Body and Accessories 🢒 Wiring Systems 🢒 ABS Indicator Inoperative

Object Number: 375190 Size: LF
ABS Components
Cell 44: Buick Indicators
Cell 44: Oldsmobile Indicators
Cell 44: Pontiac Indicators
Handling ESD Sensitive Parts Notice
Cell 10: IGN SW Fuse (1 of 2)
Cell 10: CHIME Fuse
Cell 14: G202

Circuit Description

The EBCM/EBTCM controls the ABS indicator through the brake lamp driver module. The instrument cluster or remote indicator bank supplies voltage to the ABS indicator. The brake lamp driver module acts as an inverter. When the EBCM/EBTCM supplies a ground to the brake lamp driver module, the indicator remains OFF. When the EBCM/EBTCM removes ground from the brake lamp driver module, the brake lamp driver module supplies ground to the ABS indicator.

Diagnostic Aids
    • It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
    • An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
    • If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step inspects if the EBCM/EBTCM is not capable of removing the ground for CKT 852 (WHT).

    2.

  2. This step inspects for a short to ground in CKT 39 (PNK).

    3.

  3. This step inspects for voltage at the brake lamp driver module.

    4.

  4. This step inspects for voltage from instrument cluster.

    5.

  5. This step inspects if the brake lamp driver module has a good ground.

Step

Action

Value(s)

Yes

No

1

Did you perform the ABS Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2

  1. Turn OFF the ignition.
  2. Disconnect the EBCM/EBTCM.
  3. Turn ON the ignition leaving the engine OFF.

Does the ABS indicator turn on?

--

Go to Step 16

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Reconnect the EBCM/EBTCM.
  3. Inspect the CHIME Fuse D1 in the IP fuse block.

Is the fuse OK?

--

Go to Step 4

Go to Step 5

4
  1. Install the fuse, if removed.
  2. Turn ON the ignition leaving the engine OFF.
  3. Use the J 39200 DMM in order to inspect the voltage at the fuse test terminals.

Is the voltage within the specified range?

Battery Voltage

Go to Step 6

Go to Wiring Repairs in Wiring Systems

5

  1. Turn OFF the ignition.
  2. Remove CHIME Fuse D1.
  3. Disconnect the brake lamp driver module.
  4. Use the J 39200 DMM in order to measure the resistance between terminal B of the brake lamp driver module harness connector and a good ground.

Is the resistance within the specified range?

OL (infinite)

Go to Step 9

Go to Step 8

6

  1. Turn OFF the ignition.
  2. Disconnect brake lamp driver module connector.
  3. Turn ON the ignition leaving the engine OFF.
  4. Use the J 39200 DMM in order to measure the voltage at terminal B of the brake lamp driver module harness connector.

Is the voltage within the specified range?

Battery Voltage

Go to Step 7

Go to Step 17

7

Use the J 39200 DMM in order to measure the voltage at terminal E of the brake lamp driver module harness connector.

Is the voltage within the specified range?

Battery Voltage

Go to Step 10

Go to Step 11

8

Repair a short to ground in CKT 39 (PNK). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

9
  1. Replace the fuse.
  2. Reconnect the brake lamp driver module
  3. Turn the ignition switch to the RUN position. Do not start the engine.
  4. Reinspect the CHIME Fuse D1 in the IP fuse block.

Is the fuse OK?

--

Go to Diagnostic System Check - ABS

Go to Step 12

10

  1. Turn OFF the ignition.
  2. Use the J 39200 DMM in order to measure the resistance between terminal D of the brake lamp driver module harness connector and a good ground.

Is the resistance less than the specified value?

2 ohms

Go to Step 12

Go to Step 13

11
  1. Turn OFF the ignition.
  2. Disconnect the instrument cluster connector C1.
  3. Connect a fused jumper wire between CKT 875 of the instrument cluster harness connector and a good ground.
  4. Use the J 39200 in order to measure the resistance between the brake lamp driver module harness connector terminal E and a good ground.

Is the resistance less the specified value?

2 ohms

Go to Step 14

Go to Step 15

12

Replace the brake lamp driver module. Refer to Lamp Driver Module Replacement .

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

13

Repair an open in CKT 1250 (BLK) for an open. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

14

Repair the instrument cluster as needed. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

15

Repair an open or high resistance in CKT 875 (LT GRN/BLK).

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

16

Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--

17

Repair an open or high resistance in CKT 39. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - ABS

--