For 1990-2009 cars
ABS Components
Antilock Brake System Schematics
Handling ESD Sensitive Parts Notice

### Circuit Description

The Valve relay is part of the Electronic Brake Control Module (EBCM). The EBCM turns ON the valve relay during an ABS stop. The valve relay provides power to the ABS solenoid valves.

### Conditions for Running the DTC

DTC C0125 can be set anytime.

### Conditions for Setting the DTC

The EBCM detects an open in the valve relay circuitry.

### Action Taken When the DTC Sets

• | The ABS disables

• | The ABS warning indicator turns ON

### Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.

### Diagnostic Aids

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

• | Open ABS fuse

• | Open or high resistance in the solenoid input circuit

• | Open or high resistance in the solenoid ground circuit

Inspect the following harness connectors for the following conditions:

• | Backed-out terminals

• | Improper mating

• | Broken locks

• | Improperly formed or damaged terminals

• | Poor terminal to wiring connections or physical damage to the wiring harness before component replacement:

- | Junction block electrical connectors

- | Electronic brake control module electrical connector

### Test Description

The numbers below refer to step numbers on the Diagnostic Table.

1. This step determines whether the DTC is current.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform A Diagnostic System Check - ABS? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Use the scan tool in order to clear the DTCs.
4. Using the scan tool, cycle the solenoid valves in the Special Functions menu.
5. Read the DTCs.

Does the DTC reset?

--

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3 |

1. Test the Solenoid Input circuit for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. Test the Solenoid Ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Was a problem found and corrected?

--

Go to Diagnostic System Check - ABS

Go to Step 4

4 | Replace the Brake Modulator Assembly. Refer to Brake Pressure Modulator Valve Assembly Replacement . Is the repair complete? | -- | Go to Step 5 | --
5 |

1. Use the scan tool in order to clear the DTCs.
2. Using the scan tool, cycle the solenoid valves in the Special Functions menu.
3. Read the DTCs.

Does the DTC reset?

--

Go to Step 2

System OK