ABS Indicator Inoperative. Chevrolet Joy 2008

For 1990-2009 cars

### Circuit Description

Battery voltage is supplied to the antilock brake system (ABS) warning lamp with the ignition switch in the ON or START positions. The warning lamp can be activated only by the ABS control module internally supplying ground to terminal 10 or by the shorting bar in the ABS module connector when it is disconnected from the module.

This procedure inspects for a problem in the wiring, a faulty ground, a voltage supply problem, a burned out indicator lamp, or a contact problem in a connector.

### Conditions for Setting the DTC

• | A fuse has blown.

• | The indicator lamp has burned out.

• | There is a corroded or broken connector terminal.

• | There is a faulty ground connection.

• | There is a broken wire in a wiring harness.

• | The electronic brake control module (EBCM) is faulty.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This test verifies an inoperative lamp condition.

2. This test checks for voltage on the lamp circuit.

3. This begins a series of tests of the circuit from the indicator lamp to the EBCM and ground.

4. This begins a series of tests of the voltage supply circuits that power the indicator lamp.

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle

2

1. Turn the ignition switch to LOCK.
2. Disconnect the scan tool.
3. Turn the ignition switch to ON.
4. Observe the antilock brake system (ABS) indicator lamp.

Does the lamp illuminate for about 4 seconds, then turn OFF?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3 | With the ignition still ON, observe the oil pressure lamp. Is the oil pressure lamp illuminated? | -- | Go to Step 4 | Go to Step 19

4

1. Turn the ignition switch to LOCK.
2. Disconnect the connector from the electronic brake control module (EBCM).
3. Turn the ignition switch to ON.

Does the ABS indicator illuminate?

--

Go to Step 5

Go to Step 8

5

1. Turn the ignition switch to LOCK.
2. Inspect terminals 26 and 10 at the EBCM connector.

Is there a poor connection at any of these terminals?

--

Go to Step 6

Go to Step 7

6 | Repair the faulty terminals or replace the EBCM as required. Did you complete the repair? | -- | Go to Step 30 | --
7 | Replace the EBCM. Refer to Brake Pressure Modulator Valve Assembly Replacement . Did you complete the replacement? | -- | Go to Step 30 | --

8

1. Turn the ignition switch to LOCK.
2. Disconnect the wire from the negative battery terminal.
3. Measure the resistance between the negative battery wire, which is attached to ground, and the shorting bar in the EBCM connector.

Is the resistance equal to the specified value?

0 ohms

Go to Step 10

Go to Step 9

9 | Repair the open or high resistance in the circuit from the EBCM connector, terminal 26 to ground G103. Did you complete the repair? | -- | Go to Step 30 | --

10

1. Remove the instrument panel cluster (IPC).
2. Remove and inspect the ABS indicator bulb.

Is the bulb burned out?

--

Go to Step 11

Go to Step 12

11

1. Replace the ABS indicator bulb.
2. Install the IPC.

Did you complete the repair?

--

Go to Step 30

--

12 | Test the continuity at the IPC connector terminal B1. Does the ohmmeter show the specified value? | 0 ohms | Go to Step 14 | Go to Step 13
13 | Repair the contact at the IPC connector terminal B1. Did you complete the repair? | -- | Go to Step 30 | --
14 | Inspect the wiring harnesses and the connectors in circuit from the IPC terminal B1 to terminal 10 of the EBCM connector. Does the ohmmeter show the specified value? | ∞ | Go to Step 15 | Go to Step 16
15 | Repair the open or high resistance. Did you complete the repair? | -- | Go to Step 30 | --
16 | Test for continuity between terminal 19 of the ABS connector and ground G103. Is the ground connection equal to the specified value? | 0 ohms | Go to Step 17 | Go to Step 18
17 | Replace the EBCM. Refer to Brake Pressure Modulator Valve Assembly Replacement . Did you complete the replacement? | -- | Go to Step 30 | --
18 | Repair the continuity problem between terminal 26 of the EBCM connector and ground G103. Did you complete the repair? | -- | Go to Step 30 | --

19

1. Turn the ignition switch to LOCK.
2. Inspect fuse F10 in the instrument panel (I/P) fuse block.

Is the fuse open?

--

Go to Step 20

Go to Step 21

20 | Replace fuse F10. Did you complete the replacement? | -- | System OK | --
21 | Inspect fuse Ef2 in the engine fuse block. Is the fuse open? | -- | Go to Step 22 | Go to Step 23
22 | Replace fuse Ef2. Did you complete the replacement? | -- | Go to Step 30 | --
23 | Measure the voltage at terminal 2 of the ignition switch connector by backprobing. Does the voltage measure within the specified range? | 11-14 V | Go to Step 25 | Go to Step 24

24

1. Inspect circuit between the engine fuse block and terminal 2 of the ignition switch for continuity.
2. Repair any open or high resistance found.

Did you find and correct the condition?

--

Go to Step 30

--

25

1. Turn the ignition switch to ON.
2. Backprobe terminal 4, PK, of the ignition switch connector.

Is the voltage within the specified range?

11-14 V

Go to Step 27

Go to Step 26

26 | Replace the ignition switch. Did you complete the replacement? | -- | Go to Step 30 | --

27

1. Turn the ignition switch to LOCK.
2. Inspect circuit from terminal of the ignition switch to fuse F10 in the I/P fuse block.

Does the ohmmeter show the specified value?

∞

Go to Step 28

Go to Step 29

28 | Repair the open or the high resistance. Did you complete the repair? | -- | Go to Step 30 | --

29

1. Remove the IPC.
2. Inspect circuit PK from fuse F10 to terminal A6 of the IPC connector B.
3. Repair any open or high resistance found in a wiring harness, splice pack, or connector.

Did you complete the repair?

--

Go to Step 30

--

30

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK