TBC System Message Center Messages and Displays

The IPC message center displays the gain setting and relative braking power during a braking event. The message center also indicates trailer connectivity and trailer wiring faults. The following message center messages pertain to the TBC system:

• NO TRAILER  - This message is displayed whenever the ignition is cycled from OFF to RUN without a trailer connected to the 7-pin trailer connector.
• TRAILER CONNECTED  - This message is displayed when a correct trailer connection at the 7-pin trailer connector has been made during a given ignition cycle.
• OUTPUT  - When the vehicle brake pedal is applied, or when the manual control is activated, bar indicators illuminate in the message center to indicate the amount of power going to the trailer brakes relative to the brake pedal or manual control input. One bar indicates the least amount of output with 6 bars indicating maximum output.
• TRAILER DISCONNECTED  - This message is displayed and accompanied by a single chime when a correct trailer connection was made and then a disconnection has been sensed during a given ignition cycle. This message is also displayed if any of the following occur:
  • the 7-pin trailer connector becomes disconnected while driving
  • an intermittent open circuit occurs in the vehicle wiring from the TBC module to the 7-pin trailer connector or the trailer wiring
  • during manual activation using the manual control lever without a trailer connected (accompanied by a single chime)
• TRAILER BRAKE MODULE FAULT  - This message is displayed and a DTC is stored when a fault is detected by the TBC module.
• WIRING FAULT ON TRAILER  - This message is displayed when the trailer brake output circuit is shorted to ground or shorted to voltage. A DTC sets in the TBC module indicating which circuit fault was observed. It is important to determine if a trailer was connected when this message was displayed. If this message is only observed with a trailer connected, the concern is related to the trailer wiring and not the vehicle. If this message is observed without a trailer connected, the concern is with the vehicle wiring from the TBC module to the 7-pin trailer connector.
• TBC FAULT  - This message is displayed if the Instrument Panel Cluster (IPC) is receiving communications from the TBC module, but has not been configured for a trailer brake system. If the message center displays TBC FAULT and there are no DTCs stored in the TBC module, follow the steps in Programmable Parameters to verify and/or modify the TBC module programmable parameter in the IPC.