Pinpoint Test C: One High Beam Headlamp Is Inoperative

Headlamps

Pinpoint Test C: One High Beam Headlamp Is Inoperative

Refer to Wiring Diagram Set 85 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Headlamps/Autolamps for schematic and connector information. Diagrams By Number

Normal Operation

When low beams are on and the Smart Junction Box (SJB) detects the multifunction switch in the HIGH BEAM position, the SJB energizes an internal relay. When the relay is energized, the relay routes voltage to the headlamps.

For Milan, a shutter is utilized within each headlamp. When the shutter is activated, the headlamp beam pattern changes to illuminate a greater distance.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Headlamp assembly


PINPOINT TEST C: ONE HIGH BEAM HEADLAMP IS INOPERATIVE

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

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C1 CHECK FOR VOLTAGE TO THE HEADLAMP

- Ignition OFF.
- Disconnect: Inoperative Headlamp.
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position.
- Measure the voltage between the LH headlamp C1021-7, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1041-7, circuit CLF08 (YE/VT), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
For Fusion or MKZ, GO to C2.

For Milan, INSTALL a new headlamp assembly. REFER to Headlamp Assembly Service and Repair. TEST the system for normal operation.

No
REPAIR circuit CLF08 (YE/VT) for an open. TEST the system for normal operation.

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C2 CHECK FOR VOLTAGE TO THE HEADLAMP USING THE HIGH BEAM GROUND PIN

- Measure the voltage between the LH headlamp C1021-7, circuit CLF08 (YE/VT), harness side and the LH headlamp C1021-4, circuit GD121 (BK/YE), harness side; or between the RH headlamp C1041-7, circuit CLF08 (YE/VT), harness side and the RH headlamp C1041-4, circuit GD123 (BK/GY), harness side.




- Is the voltage greater than 10 volts?

Yes
REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly Service and Repair. TEST the system for normal operation.

No
REPAIR circuit GD121 (BK/YE) (LH headlamp) or circuit GD123 (BK/GY) (RH headlamp) for an open. TEST the system for normal operation.

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