Circuit Description
Ignition voltage is supplied through terminal C10 of the Electronic Brake Control Relay. The above condition enables the EBCM to energize the pull-in coil by completing the ground circuit at connector C1 terminal A11 of the EBCM. The magnetic field created closes the Electronic Brake Control Relay contacts. The magnetic field also allows battery voltage and current through the Electronic Brake Control Relay terminal B10 to be supplied to the EBCM through connector C2 terminal C and to the brake solenoid valves through S133.
Conditions for Setting the DTC
DTC C 1215 can set only before the EBCM commands the Electronic Brake Control Relay on.
DTC C 1215 determines if the Electronic Brake Control Relay energizes when the Electronic Brake Control Relay should not energize. The above malfunction will 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. The DTC sets if the malfunction is present for three consecutive drive cycles.
Action Taken When the DTC Sets
| • | A malfunction DTC is stored. |
| • | The ABS does not disable. |
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. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
| • | A poor connection |
| • | Rubbed-through wire insulation |
| • | A broken wire inside the insulation |
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction, refer to the Scan Tool manual.
Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Physical damage to the wiring harness |
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:
- Start the vehicle.
- Drive the vehicle over 16 km/h (10 mph).
- Stop the vehicle.
- Turn the ignition to the OFF position.
Important: Zero the J 39200 test leads before making any resistance measurements.
Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | ||||||||||||
2 | Are any other DTCs present? | -- | Go to Diagnostic Trouble Code (DTC) List for appropriate DTC | |||||||||||
3 |
Do not start the engine. Does the scan tool indicate that the Electronic Brake Control Relay is off and the battery voltage less than or equal to the specified voltage? | 5 V | Go to Diagnostic Aids | |||||||||||
4 |
Do not start the engine. Is the voltage less than or equal to the specified voltage? | 2 V | ||||||||||||
5 |
Do not start the engine. Is the voltage less than or equal to the specified voltage? | 2 V | ||||||||||||
6 |
The above conditions may cause a short to voltage. Refer to General Electrical Diagnosis , in wiring systems. Is there a condition that may cause a short to voltage? | -- | ||||||||||||
7 |
Do not start the engine. Does the scan tool indicate that the Electronic Brake Control Relay is off and is the battery voltage less than or equal to the specified voltage? | 5 V | Go to Diagnostic Aids | |||||||||||
8 | Replace all of the terminals or the connectors that exhibit signs of poor terminal contact, corrosion, or damaged terminals. Is the repair complete? | -- | -- | |||||||||||
9 | Repair the short to voltage in CKT 1633. Is the repair complete? | -- | -- | |||||||||||
10 | Replace the Electronic Brake Control Relay. Refer to Electronic Brake Control Relay Replacement . Is the repair complete? | -- | -- | |||||||||||
11 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- |
