Pinpoint Test D: One High Beam Headlamp Is Inoperative

Headlamps

Pinpoint Tests

Pinpoint Test D: 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 sends voltage through circuit CLS08 (VT/GN) to the high beam headlamps. Ground is supplied on circuit GD121 (BK/YE) and circuit GD123 (BK/GY) for the LH and RH high beam headlamps.

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.

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

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D1 CHECK CIRCUIT CLS08 (VT/GN) FOR AN OPEN


- 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 CLS08 (VT/GN), harness side and ground; or between the RH headlamp C1041-7, circuit CLS08 (VT/GN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to D2.

No
REPAIR the circuit. TEST the system for normal operation.

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D2 CHECK CIRCUIT GD121 (BK/YE) (LH HEADLAMP) OR CIRCUIT GD123 (BK/GY) (RH HEADLAMP) FOR AN OPEN


- Place the headlamp switch in the OFF position.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the LH headlamp C1021-4, circuit GD121 (BK/YE), harness side and ground; or between the RH headlamp C1041-4, circuit GD123 (BK/GY), harness side and ground.




- Is the resistance less than 5 ohms?

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

No
REPAIR the circuit in question. TEST the system for normal operation.

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