C0235

DTC C0235 Rear Wheel Speed Signal Circuit Open (Diesel):

DTC C0235 Rear Wheel Speed Signal Circuit Open (Diesel) 1 Of 2:

DTC C0235 Rear Wheel Speed Signal Circuit Open (Diesel) 2 Of 2:

CIRCUIT DESCRIPTION
The Electronic Brake Control Module (EBCM) receives the rear wheel speed signal from the Vehicle Speed Sensor Buffer. The rear wheel speed signal originates from the Vehicle Speed Sensor (VSS) which is connected to the Vehicle Speed Sensor Buffer. When the vehicle is not moving, the Vehicle Speed Sensor Buffer will have 12 VDC present on the circuit. The EBCM checks for this voltage when the vehicle is not moving.

CONDITIONS FOR SETTING THE DTC
- EBCM not seeing the correct voltage level from the Vehicle Speed Sensor Buffer at startup.

ACTION TAKEN WHEN THE DTC SETS
- The ABS indicator lamp turns on
- The ABS disables DTC C0235 is a Condition Latched DTC, which indicates that the above actions are true until the condition is cleared.

CONDITIONS FOR CLEARING THE DTC
- Repair the conditions responsible for setting the DTC
- Use the Scan Toot Clear DTCs function

DIAGNOSTIC AIDS
This DTC can be set by a faulty EBCM or a fault in Circuit (CKT) 1827.

If the voltage readings are low or varying, the battery or charging system could be the cause. Check these areas before replacing any components. In addition, any of the following conditions may cause an intermittent malfunction:
- A poor connection
- Wire insulation that is rubbed through
- A wire breaks inside the insulation.

Thoroughly check any circuitry that is suspected of causing 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

TEST DESCRIPTION
The numbers below refer to the steps in the diagnostic table:
2. This step uses the voltage output from the Vehicle Speed Sensor Buffer to check the 1827 CKT.
3. This step checks the 1827 CKT for proper resistance.
5. This step checks for a short in the wiring between the ECBM and the Vehicle Speed Sensor Buffer.