Pinpoint Test AH: DTC U3003:16

Adaptive Headlighting

Pinpoint Tests

Pinpoint Test AH: DTC U3003:16

Refer to Wiring Diagram Set 60 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Instrument Cluster for schematic and connector information. Diagrams By Number

Normal Operation
- DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - sets continuous and on-demand in the Headlamp Control Module (HCM) if the HCM detects battery voltage below 9 volts from the HCM voltage supply circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- HCM



PINPOINT TEST AH: DTC U3003:16

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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AH1 RECHECK THE HCM DTCs


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: HCM Self-Test.
- Clear the DTCs. Repeat the HCM self-test.
- Is DTC U3003:16 still present?

Yes
GO to AH2.

No
The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

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AH2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM


- Enter the following diagnostic mode on the scan tool: PCM Self-Test.
- Carry out the PCM Key ON Engine OFF (KOEO) self-test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC P0620, P0622, P0625, P0626 or P065B set in the PCM?

Yes
REFER to Charging System.

No
GO to AH3.

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AH3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE


- Check the battery condition and verify that the battery is fully charged. Refer to Battery.
- Is the battery OK and fully charged?

Yes
GO to AH4.

No
REFER to Battery.

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AH4 CHECK THE HCM VOLTAGE SUPPLY


- Ignition OFF.
- Disconnect: HCM C1600.
- Ignition ON.
- Measure and record the voltage at the battery.
- Measure the voltage between the HCM C1600-10, circuit CBP42 (GN), harness side and ground.




- Is the voltage within 0.2 volt of the recorded battery voltage?

Yes
GO to AH5.

No
REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.

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AH5 CHECK THE HCM GROUND CIRCUIT


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the HCM C1600-3, circuit GD121 (BK/YE), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new HCM. REFER to Headlamp Control Module (HCM) Service and Repair. TEST the system for normal operation.

No
REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.

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