overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0870 00
- Device Voltage Reference Output 1 Circuit
DTC C1112 00
- Trailer Brake Control Relay Low Control Circuit
DTC C1113 01
- Trailer Brake Control Relay High Control Circuit Short to Battery
DTC C1114 00
- Trailer Brake Control Solenoids Control Circuit
DTC C1119 00
- Trailer Brake Control Relay Feedback Circuit
Diagnostic Fault Information
Circuit/System Description
The trailer brake control relay receives inputs from the trailer brake control module (TBCM), these inputs are used to determine the amount of
voltage the relay will supply to the trailer brakes.
Conditions for Running the DTC
* Ignition ON.
* Battery voltage is 9.5-17 V.
* The module is powered up and completes initialization.
Conditions for Setting the DTC
C0870 00
The trailer brake control module circuit reference voltage for the trailer brake control relay is below 4.8 V or above 5.2 V.
C1112 00
* The trailer brake control module detects a short to ground, open or a short to voltage on the integrated trailer brake relay control active low
circuit.
* The trailer brake control module detects an open in the battery positive voltage circuit to the trailer brake control relay.
* The trailer brake control module detects an open in the ground circuit to the trailer brake control relay.
* The trailer brake control module detects a short to ground or open in the solid state relay enable circuit.
C1113 01
* The trailer brake control module detects a short to voltage in the solid state relay enable circuit.
* The trailer brake control module detects a short to voltage in the trailer brake output supply voltage control circuit.
C1114 00
The trailer brake control module detects a short to ground, open or a short to voltage on the solid state relay output circuit.
