C1278

Circuit Description
This Diagnostic Trouble Code (DTC) identifies a solenoid that cannot be energized due to an open in its circuitry, or a solenoid that is always energized due to a short to battery in its circuitry between the driver and the solenoid.
An open will not allow proper Antiloco Brake System (ABS) operation, but the short to battery simply turns ON the solenoid. A path for base brakes is still allowed once the motor re-homes and the check ball is lifted off its seat during initialization.

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 voltage or open in Circuit (CKT) 9J01 and/or open in CKT 9V01.
- This DTC can be set only when the solenoid is OFF.
- Action Taken When the DTC Sets
- A malfunction DTC stores.
- The ABS disables.
- The ABS warning indicator turns ON.

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
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.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness

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