For 1990-2009 cars
ABS Components
Cell 44: ABS Pump Motor, BPMV, Solenoid Valves, and Stoplamp Switch
Handling ESD Sensitive Parts Notice

### Circuit Description

The Electronic Brake Control Module (EBCM) turns OFF the ABS warning indicator by grounding terminal 11 after Initilization.

The ABS warning indicator is connected to the gauge fuse. This circuit has power when the ignition switch is in the ON or START positions.

When the ignition switch is turned to the ON position, the EBCM turns ON the ABS warning indicator for 3 seconds for a bulb check. If the EBCM detects a malfunction, the ABS warning indicator will stay ON to warn the driver that the ABS is disabled and it needs service.

### Diagnostic Aids

Inspect for the following when diagnosing this part of the Antilock Brake System (ABS):

• | Open gauge fuse

• | Open ABS warning indicator bulb filament

• | Open or poor G103

• | Open within Instrument panel gage cluster printed circuit

Inspect the following harness connectors:

• | For backed-out terminals

• | For improper mating

• | For broken locks

• | For improperly formed or damaged terminals

• | For poor terminal to wiring connections

• | For physical damage to the wiring harness before component replacement:

- | Instrument panel gage cluster electrical connectors

- | Junction block electrical connectors

- | EBCM electrical connector

### Test Description

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

1. Tests for power distribution to the instrument panel gage cluster.

2. Tests for power distribution to the EBCM (ignition power).

3. Tests for power distribution to the EBCM for motor and solenoids.

4. Tests for proper ground to the EBCM.

5. Tests for proper ground to the EBCM.

6. Tests for a short to ground in the ignition power circuit.

7. Tests for an open or high resistance in the ignition power circuit.

8. Tests for excessive current draw from the EBCM.

9. Tests for a short to ground in the motor power input circuit.

10. Tests for a short to ground in the solenoid power input circuit.

11. Tests for an open or high resistance in the motor power input circuit.

12. Tests for an open or high resistance in the solenoid power input circuit.

13. Tests for excessive current draw from the EBCM.

14. Tests for an open or high resistance in the ignition power circuit.

15. Tests for an open or high resistance in the motor power input circuit.

16. Tests the integrity of the ABS warning indicator circuit.

17. Tests for a bulb open filament of the ABS warning indicator.

18. Test for an open or high resistance in the instrument panel gage cluster power input circuit.

19. Tests the ability of the EBCM to turn ON the ABS warning indicator through a scan tool command.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 | Remove and inspect the GAUGE fuse. Is the GAUGE fuse open? | -- | Go to Step 20 | Go to Step 3
3 | Remove and inspect the ECU-IG fuse. Is the ECU-IG fuse open? | -- | Go to Step 7 | Go to Step 4
4 | Remove and inspect the ABS fuse. Is the ABS fuse open? | -- | Go to Step 10 | Go to Step 5
5 |

1. Turn the ignition switch to the LOCK position.
2. Disconnect the Electronic Brake Control Module (EBCM) electrical connector.
3. Use J 39200 (DMM) in order to measure the resistance between the EBCM electrical connector terminal C (harness side) and ground.

Is the resistance within the specified range?

0-2 ohms

Go to Step 6

Go to Step 28

6 | Use J 39200 (DMM) in order to measure the resistance between the EBCM electrical connector terminal A (harness side) and ground. Is the resistance within the specified range? | 0-2 ohms | Go to Step 15 | Go to Step 29
7 |

1. Turn the ignition switch to the LOCK position.
2. Disconnect the EBCM electrical connector.
3. Use J 39200 (DMM) in order to measure the resistance between ground and the EBCM electrical connector terminal 13 (harness side).

Is the resistance equal to the specified value?

OL

(Infinite)

Go to Step 8

Go to Step 21

8 |

1. Install a new ECU-IG fuse.
2. Turn the ignition switch to the ON position.
3. Use J 39200 (DMM) in order to measure the voltage between ground and the EBCM electrical connector terminal 13 (harness side).

Is the voltage within the specified range?

Battery Voltage (10-14 V)

Go to Step 9

Go to Step 22

9 |

1. Turn the ignition switch to the LOCK position.
2. Reconnect the EBCM electrical connector.
3. Turn the ignition switch to the ON position.
4. Inspect the ECU-IG fuse again.

Is the ECU-IG fuse open again?

--

Go to Step 23

Go to Diagnostic System Check - ABS

10 |

1. Turn the ignition switch to the LOCK position.
2. Disconnect the EBCM electrical connector.
3. Use J 39200 (DMM) in order to measure the resistance between the EBCM electrical connector terminal D (harness side) and ground.

Is the resistance equal to the specified value?

OL

(Infinite)

Go to Step 11

Go to Step 24

11 | Use J 39200 (DMM) in order to measure the resistance between the EBCM electrical connector terminal B (harness side) and ground. Is the resistance equal to the specified value? | OL (Infinite) | Go to Step 12 | Go to Step 25
12 |

1. Install a new ABS fuse.
2. Use J 39200 (DMM) in order to measure the voltage between the EBCM electrical connector terminal D (harness side) and ground.

Is the voltage within the specified range?

Battery Voltage (10-14 V)

Go to Step 13

Go to Step 26

13 | Use J 39200 (DMM) in order to measure the voltage between the EBCM electrical connector terminal B (harness side) and ground. Is the voltage within the specified range? | Battery Voltage (10-14 V) | Go to Step 14 | Go to Step 27
14 |

1. Turn the ignition switch to the LOCK position.
2. Reconnect the EBCM electrical connector.
3. Turn the ignition switch to the ON position.
4. Inspect the ABS fuse again.

Is the ABS fuse open again?

--

Go to Step 23

Go to Diagnostic System Check - ABS

15 |

1. Turn the ignition switch to the ON position.
2. Use J 39200 (DMM) in order to measure the voltage between the EBCM electrical connector terminal 13 (harness side) and ground.

Is the voltage within the specified range?

Battery Voltage (10-14 V)

Go to Step 16

Go to Step 22

16 | Use J 39200 (DMM) in order to measure the voltage between the EBCM electrical connector terminal D (harness side) and ground. Is the voltage within the specified range? | Battery Voltage (10-14 V) | Go to Step 17 | Go to Step 26
17 |

1. Turn the ignition switch to the LOCK position.
2. Disconnect the EBCM electrical connector (if not already disconnected).
3. Turn the ignition switch to the ON position.

Does the ABS indicator illuminate?

--

Go to Step 34

Go to Step 18

18 |

1. Remove the instrument panel gage cluster. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gages, and Console.
2. Remove and inspect the ABS indicator bulb filament.

Is the ABS indicator bulb filament open?

--

Go to Step 31

Go to Step 19

19 |

1. Turn the ignition switch to the ON position.
2. Using J 39200 DMM, measure the voltage between the instrument panel gage cluster electrical connector C1 terminal 2 (harness side) and ground.

Is the voltage within the specified range?

Battery Voltage (10-14 V)

Go to Step 35

Go to Step 32

20 | Repair the short to ground in RED/BLU wire between the GAUGE fuse and the instrument panel gage cluster. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
21 | Repair the short to ground in the BLK/YEL wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
22 | Repair the open or high resistance in the BLK/YEL wire. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
23 | Replace the brake pressure modulator valve assembly. Refer to Brake Pressure Modulator Valve Assembly Replacement . Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
24 | Repair the short to ground in the RED wire between the ABS fuse and the EBCM connector terminal D. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
25 | Repair the short to ground in the RED wire between the ABS fuse and the EBCM harness terminal B. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
26 | Repair the open or high resistance in the RED wire between the ABS fuse and the EBCM harness terminal D. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
27 | Repair the open or high resistance in the BLK/YEL wire or poor G103. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
28 | Repair the open or high resistance in the WHT/BLK wire between the EBCM connector terminal C and G103 or poor G103. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
29 | Repair the open or high resistance in the WHT/BLK wire between the EBCM connector terminal A and G103 or poor G103. Refer to Wiring Repairs in Wiring Systems. Is the repair complete. | -- | Go to Diagnostic System Check - ABS | --
30 | Replace the ABS Lamp Driver Relay. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
31 | Replace the ABS indicator bulb. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
32 | Repair the open or high resistance in the RED/BLU wire between the GAUGE fuse and the instrument panel gage cluster electrical connector C1. Is the repair complete | -- | Go to Diagnostic System Check - ABS | --
33 | Repair the open or high resistance in the WHT/RED wire. Is the repair complete? | -- | Go to Diagnostic System Check - ABS | --
34 |

1. Turn the ignition switch to the LOCK position.
2. Reconnect the EBCM electrical connector.
3. Connect a scan tool to the OBD II DLC.
4. Turn the ignition switch to the ON position.
5. Select Special Functions on the Application Menu of the scan tool.
6. Select Device Control on the scan tool.
7. Command the ABS Warning Indicator ON with the scan tool.

Does the ABS indicator turn ON when commanded with the scan tool?

--

Go to Diagnostic System Check - ABS

Go to Step 23

35 | Measure the resistance between the Instrument Cluster Harness Connector C2 Terminal II and the EBCM harness connector Terminal II. Is the resistance within the specified range? | 0--2ohms | Go to Step 30 | Go to Step 33