Pinpoint Test D: DTC B1317

Auxiliary Brake System - Trailer Brake Control (TBC) Module

Pinpoint Test D: DTC B1317

Normal Operation

- DTC B1317 (Battery Voltage High)- this DTC sets in continuous memory or on-demand in the Trailer Brake Control (TBC) module when the TBC (Trailer Brake Control) module detects that battery voltage has risen above 16 volts on the voltage supply circuit while not braking.

This pinpoint test is intended to diagnose the following:

- Charging system concern

- TBC (Trailer Brake Control) module

PINPOINT TEST D : DTC B1317

NOTE:
DTC B1317 may be stored in the module memory due to previous battery charging or vehicle jump starting events.

D1 CHECK FOR DTC B1317, B1676, P0563 (PCM) OR U3003:17 SET IN OTHER MODULES

- Ignition ON.

- Retrieve the continuous memory DTCs from all modules.

Is DTC B1317, B1676, P0563 (PCM) or U3003:17 set in more than one module?

Yes
REFER to Charging System to diagnose an overcharging condition.
No
GO to D2.

D2 CHECK THE BATTERY VOLTAGE

- Turn off all interior/exterior lights and accessories.

- Start and run the engine at approximately 2,000 rpm for 3 minutes while monitoring the battery voltage.

Does the battery voltage rise to 16 volts or higher?

Yes
REFER to Charging System to diagnose an overcharging condition.
No
GO to D3.

D3 RECHECK FOR DTC B1317

- Turn the engine off.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: TBC (Trailer Brake Control) module Self-Test.

- Clear the continuous memory DTCs.

- Carry out the TBC (Trailer Brake Control) module self-test.

Is DTC B1317 present?

Yes
INSTALL a new TBC (Trailer Brake Control) module. REFER to Trailer Brake Control (TBC) Module module. TEST the system for normal operation.
No
The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.