C1217

Part 1 Of 2:

Part 2 Of 2:

Circuit Description
Ignition voltage is supplied to terminal 85 of the electronic brake control relay. The Electronic Brake Control Module (EBCM) is then able to energize the pull-in coil by completing the ground circuit at EBCM connector C1 terminal D6.The magnetic field created closes the electronic brake control relay contacts and allows battery voltage and current to be supplied to the EBCM. In addition, the EBCM supplies power to the motors and the Antilock Brake System (ABS) solenoids.

Conditions for Setting the Diagnostic Trouble Code (DTC)
- DTC C1217 can set before the EBCM commands the electronic brake control relay ON.
- DTC C1217 determines if the electronic brake contra relay energizes when the electronic brake control relay should not energize. The above malfunction would not allow the electronic brake control relay to remove power to the ABS system.
- If a second malfunction occurs, that requires the electronic brake control relay to turn OFF, the second malfunction cannot be removed if the electronic brake control relay cannot be controlled.

Action Taken When the DTC Sets
- A malfunction DTC stores.
- ABS is not disabled.

Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
- 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF.

Diagnostic Aids
- Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.
- Clear the DTCs after completing the diagnosis.
- Test drive the vehicle for three drive cycles in order to verify that the DTC does not reset.
- Use the following procedure in order to complete one drive cycle:
1. Start the vehicle.
2. Drive the vehicle over 16 km/in (10 mph).
3. Stop the vehicle.
4. Turn the ignition to the OFF position.

IMPORTANT: Zero the J 89200 test leads before making any resistance measurements. Refer to the J 39200 user's manual.