Circuit/System Description
The fuel pump/trailer brake control module system has a control panel with the trailer gain and manual apply switches. The switches are located on
the instrument panel to the left of the steering column. The control panel and switches allows you to adjust the amount of output, referred to as
trailer gain, available to the electric trailer brakes and allows you to manually apply the trailer brakes. The Trailer Brake Control Panel, and
switches are used along with the Trailer Brake Display Page on the Driver Information Center to adjust and display power output to the trailer
brakes.
Conditions for Running the DTC
* Battery voltage is 9.5-17 V.
* The module is powered up and completes initialization.
Conditions for Setting the DTC
C0880 00 or C0890 00
The fuel pump/trailer brake control module detects the 5 V reference circuit voltage is less than 4.8 V or greater than 5.2 V.
C1115 08 or C1115 5A
* The fuel pump/trailer brake control module detects the manual apply switch is applied before the ignition is cycled OFF, and continuously
applied for 30 seconds after ignition is cycled to ON.
* The fuel pump/trailer brake control module detects the manual apply switch is applied continuously for 5 minutes.
* The fault is detected if the manual apply switch input and redundant apply switch input exceeds a threshold for an extended amount of time.
C1116 00
* The fuel pump/trailer brake control module detects a short to ground, open or a short to voltage on the manual apply signal circuit.
* The fuel pump/trailer brake control module detects a open on the low reference circuit.
C1117 00
* The fuel pump/trailer brake control module detects a short to ground, open or a short to voltage on the redundant manual apply signal circuit.
* The fuel pump/trailer brake control module detects a short to voltage on the manual apply signal circuit.
* The fuel pump/trailer brake control module detects a open on the low reference circuit.
C1118 00
* The fuel pump/trailer brake control module detects a short to ground, open or a short to voltage on the user gain signal circuit.
* The fuel pump/trailer brake control module detects a open on the low reference circuit.
C1118 08
* The fuel pump/trailer brake control module detects the user gain switch is applied before the ignition is cycled OFF, and continuously applied
for 30 seconds after ignition is cycled to ON.
* The fuel pump/trailer brake control module detects the user gain switch is applied continuously for 5 minutes.
Action Taken When the DTC Sets
* The trailer brake control will be disabled for the remainder of the ignition cycle.
* The driver information center (DIC) will display Service Trailer Brake System.
Condition for Clearing the DTC
* The condition for the DTC is no longer present.
* The fuel pump/trailer brake control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Reference Information
Schematic Reference
Trailer Brake Control Schematics (See: Brakes and Traction Control/Diagrams/Electrical Diagrams)
