Pinpoint Test C: One High Beam Headlamp Is Inoperative

Headlamps

Pinpoint Tests

Pinpoint Test C: One High Beam Headlamp Is Inoperative

Refer to Wiring Diagram Set 85, Headlamps/Autolamps for schematic and connector information. Diagrams By Number

Normal Operation

When the Smart Junction Box (SJB) detects the headlamp switch in the HEADLAMPS ON position and 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 high beams.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Headlamp assembly (MKX)



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 THE LOW BEAM OPERATION


- Check the operation of the low beams.
- Do the low beams operate correctly?

Yes
GO to C2.

No
GO to Pinpoint Test B. Pinpoint Test B: One Low Beam Headlamp Is Inoperative

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C2 CHECK FOR VOLTAGE TO THE HEADLAMP


- Ignition OFF.
- Disconnect: Inoperative Headlamp.
- Measure the voltage between the inoperative lamp, harness side and ground as follows:










- Is the voltage greater than 10 volts?

Yes
For Edge, REPAIR circuit GD120 (BK/GN) (LH headlamp) or circuit GD123 (BK/GY) (RH headlamp) for an open. TEST the system for normal operation.

For MKX, GO to C3.

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

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C3 CHECK FOR VOLTAGE TO THE HEADLAMP USING THE CONNECTOR GROUND


- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position.
- Measure the voltage between the inoperative lamp, harness side and ground as follows:










- 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 GD120 (BK/GN) (LH headlamp) or circuit GD123 (BK/GY) (RH headlamp) for an open. TEST the system for normal operation.

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