Pinpoint Test D: One High Beam Headlamp Is Inoperative

Headlamps

Pinpoint Test D: One High Beam Headlamp Is Inoperative

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 (Smart Junction Box) energizes an internal relay. When the relay is energized, the relay routes voltage to the headlamps. Ground is shared with the low beams.

The High Intensity Discharge (HID) headlamps utilize a shutter 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 D : 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.

D1 CHECK THE LOW BEAM OPERATION

- Check the operation of the low beams.

Do the low beams operate correctly?

Yes
GO to D2.

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

D2 CHECK THE SJB (Smart Junction Box) HIGH BEAM OUTPUT CIRCUIT FOR AN OPEN

- 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 C1021-10, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1041-10, circuit CLF08 (YE/VT), harness side and ground.





Is the voltage greater than 10 volts?

Yes
INSTALL a new headlamp assembly. REFER to Headlamp Assembly . TEST the system for normal operation.

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