GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The electronic brake control module (EBCM) is wired to the ignition 1 voltage circuit to indicate the ignition ON/OFF state. The EBCM monitors this voltage and the voltage on the front wheel speed sensor voltage supply circuits to ensure that the voltages remain within an acceptable operating range. The EBCM cannot operate properly when the system voltage is too low.

Conditions for Running the DTC

    • The ignition is ON.
    • The power mode is not detected as being CRANK.

Conditions for Setting the DTC

Either of the following conditions may cause the DTC to set.

    • The EBCM detects voltage below 9.5 volts at the ignition 1 circuit for 2 seconds.
    • The EBCM detects voltage below 7.3 volts at either of the front wheel speed sensor voltage supply circuits for 20 seconds.

Action Taken When the DTC Sets

The following actions may occur when this DTC sets.

    • The EBCM disables the ABS/TCS.
    • The EBCM disable the DRP.
    • The ABS indicator turns ON.
    • The brake warning indicator turns ON.
    • The ABS fault message is displayed.
    • The traction fault message is displayed.
    • The brakes message is displayed.

Conditions for Clearing the DTC

The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids

Although 2-20 seconds of low voltage detection are required to set this DTC, ABS related systems may be disabled by the EBCM during the fault detection process and prior to setting this DTC. This means that the instrument panel cluster (IPC) may turn ON indicators and fault messages intermittently without the EBCM setting any DTCs if low voltage faults are intermittent.

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 ABS Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2

Is DTC C0035 set as either a Current or History DTC?

--

Go to DTC C0035

Go to Step 3

3

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

Does the DTC set?

--

Go to Step 4

Go to Diagnostic Aids

4

Perform the Diagnostic System Check - Engine Electrical in Engine Electrical.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 5

5

  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM) harness connector.
  3. Remove the 10 amp ABS fuse from the underhood fuse panel.
  4. Use a DMM to measure the resistance between the unpowered side of the ABS fuse cavity and the ignition 1 voltage circuit at the EBCM harness connector.

Does the resistance measure within the specified range?

0-0.2 ohms

Go to Step 7

Go to Step 6

6

Repair the high resistance in the ignition 3 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 9

--

7

Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 8

8

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

Did you complete the replacement?

--

Go to Step 9

--

9

  1. Use the scan tool 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 3

System OK