Battery System, Hybrid Drive

High-Voltage Traction Battery

Pinpoint Test AG: DTC U3003:62

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

During normal vehicle operation the 12-volt battery supplies voltage to the Battery Energy Control Module (BECM) in order for the BECM (Battery Energy Control Module) to operate. The BECM (Battery Energy Control Module) compares the voltage of the DC to DC Converter Control Module (DC/DC) which is communicated via the High Speed Controller Area Network (HS-CAN).

- U3003:62 (Battery Voltage: Signal Compare Failure)- Fault sets when the BECM (Battery Energy Control Module) does a compare with the DC to DC Converter Control Module (DC/DC) and the input voltages to both modules do not match.

This pinpoint test is intended to diagnose the following:

- DC/DC (DC to DC Converter Control Module)

- BECM (Battery Energy Control Module)

PINPOINT TEST AG : DTCs U3003:62

AG1 RETRIEVE BECM (Battery Energy Control Module) DTCs

- Connect the scan tool.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self Test- BECM (Battery Energy Control Module).

Are any DTCs other than U3003:62 retrieved?

Yes
REFER to the Battery Energy Control Module (BECM) DTC Chart and diagnose all other DTCs first. Battery Energy Control Module (BECM) DTC Chart

No
GO to AG2.

AG2 RETRIEVE DC/DC (DC to DC Converter Control Module) DTCs

- Enter the following diagnostic mode on the scan tool: Self Test- DC/DC (DC to DC Converter Control Module).

Are any DTCs retrieved?

Yes
REFER to Hybrid Drive Systems to diagnose DC/DC (DC to DC Converter Control Module) DTCs.

No
GO to AG3.

AG3 CHECK FOR CORRECT BECM (Battery Energy Control Module) OPERATION

- Ignition OFF.

- Check the BECM (Battery Energy Control Module) harness and component side connectors for:
- corrosion.
- pushed-out/bent pins.


- Connect the BECM (Battery Energy Control Module) and make sure the connectors seat correctly.

- Operate the system and determine if the concern is still present.

Is the concern still present?

Yes
INSTALL a new BECM (Battery Energy Control Module). REFER to Battery Energy Control Module (BECM) . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.