C1265

EBCM/Motor Pack Schematic:

CIRCUIT DESCRIPTION
This Diagnostic Trouble Code (DTC) identifies a motor circuit that is shorted to ground. A short to ground will not allow controlled ABS operation.

CONDITIONS FOR SETTING THE DTC
This DTC will set when the following conditions are met:
^ The Electronic Brake Control Module (EBCM) detects a short to ground in CKT 9E01 and/or 9F01.
^ DTC can be set anytime.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS is disabled, and the amber ABS indicator lamp is turned ON. The red BRAKE warning lamp is turned ON if the rear piston in the motor pack is not expected to be in the home position.

CONDITIONS FOR CLEARING THE DTC
^ Conditions for the malfunction are no longer present and the Tech 2 scan tool Clear DTC Information function is used.
^ One hundred drive cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
The following list contains items that need to be inspected when diagnosing this system:
^ Short to ground between the rear motor and the EBCM (CKT 9E01 and/or 9F01).
^ Rear motor armature winding grounded (low resistance to ground).
^ Faulty EBCM.

NOTE: An intermittent malfunction is most likely caused by a rubbed through wire insulation or a short to ground within the motor.

If The Malfunction Is Not Current - wiggle the wires of the affected channel and check if the DTC resets. This will help to pinpoint an intermittent malfunction in the motor circuitry or connections.

The Frequency Of The Malfunction - can be checked by using the Enhanced Diagnostic function of the Tech 2 scan tool, as described in Enhanced Diagnostics.

DTC C1265 Rear ABS Motor Circuit Shorted To Ground (Part 1 Of 2):

DTC C1265 Rear ABS Motor Circuit Shorted To Ground (Part 2 Of 2):

TEST DESCRIPTION
Numbers below refer to numbers on the diagnostic table.
[3] Checks for a short to ground in CKT 9E01.
[4] Checks for a short to ground in CKT 9F01.