Pinpoint Test J: U3003:17

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to TRAILER/CAMPER ADAPTER for schematic and connector information.

Normal Operation and Fault Conditions

The TRM requires an operating voltage between 9 and 16 volts. The TRM receives this voltage from the BCMC. The TRM has a single ground circuit. An overcharging condition in the charging system results in the TRM setting a DTC. This DTC may also set in the TRM due to battery charging or vehicle jump starting events. If the voltage exceeds 19 volts the TRM disables the trailer brake output and shuts down.

REFER to: Auxiliary Brake System - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
TBM U3003:17	Battery Voltage: Circuit Voltage Above Threshold	This DTC sets in continuous memory and on-demand if the voltage supplied to the TRM is above 16 volts for more than 5 seconds while not braking. This DTC may also set in the TRM due to battery charging or vehicle jump starting events.

Possible Sources

Charging system concern
TRM

J1 CHECK FOR HIGH VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES

NOTE: The TRM is a combined TBM and Trailer Lighting Module.
- Ignition ON.
- Using a diagnostic scan tool, retrieve and record all Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC B1317, B1318, B1676, U3003:16 or U3003:17 present in one or more modules AND are any charging system Diagnostic Trouble Codes (DTCs) present in the PCM?

Yes DIAGNOSE the charging system concern.

No GO to J2

J2 CHECK THE BATTERY VOLTAGE

Turn off all interior lights, exterior lights and accessories.

NOTE: Do not allow the engine speed to increase above 2, 000 RPM while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2, 000 RPM, turn the vehicle off and restart the engine before performing this step.

Start and run the engine at approximately 1, 500 RPM for 3 minutes while monitoring the battery voltage.

Is the battery voltage between 13 and 15.2 volts?

Yes

GO to J3

No	DIAGNOSE the overcharging condition. REFER to: Charging System - 2.7L EcoBoost (238kW/324PS)/3.5L EcoBoost (272kW/370PS) . REFER to: Charging System - 3.3L Duratec-V6/5.0L 32V Ti-VCT . REFER to: Charging System - 3.0L Power Stroke Diesel .

J3 RECHECK FOR TBM (TRAILER BRAKE CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) U3003:17

Turn the engine off.

Ignition ON.

Using a diagnostic scan tool, carry out the TBM self-test.

Clear the TBM Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, carry out the TBM self-test.

Is DTC U3003:17 present?

Yes

GO to J4

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.

J4 CHECK FOR CORRECT TRM (TRAILER MODULE) OPERATION

Disconnect TRM C2498C.

Using a good light source, inspect the connector for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary

Connect TRM C2498C, make sure it seats and latches correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new TRM module. REFER to: Trailer Module (TRM) .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.