Power Supply to Control Module, No DTCs Stored

Power Supply to Control Module, No DTCs Stored





Circuit Description
Battery voltage is supplied to the Electronic Brake Control Module (EBCM) through fuse F11 in the I/P fuse block, to terminal 20 of the EBCM connector. The voltage is present when the ignition switch is in the ON or START position.

Diagnosis
This test checks for battery output, proper grounding, blown fuses, a faulty ignition switch, and problems in the circuitry.

Cause(s)
^ The battery is defective.
^ There is a defective ground connection.
^ A connector is damaged.
^ A wire is broken or shorted.
^ A fuse is blown.
^ The ignition switch is malfunctioning.

Fail Action
ABS action is disabled during the period of low voltage.

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. This step determines whether there is voltage at the battery and the high current source.
2. This step checks for voltage at the ignition 1 source.
3. This step begins the check for voltage at the EBCM end of the ABS harness.
4. This step checks for a defective ground connection.
5. This is a check for a defective EBCM connector.

Diagnostic Aids
It is very important to perform a thorough inspection of the wiring and the connectors. Failure to do so may result in misdiagnosis, causing part replacement with a reappearance of the malfunction.

Troubleshooting

Step 1-6:

Step 7-19:

Step 20-26: