Pinpoint Test G: The Flash-To-Pass Feature Is Inoperative

Headlamps

Pinpoint Tests

Pinpoint Test G: The Flash-to-Pass Feature is Inoperative

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

Normal Operation

The Smart Junction Box (SJB) sends a voltage reference signal to the multifunction switch through circuit 1395 (RD/PK). When the flash-to-pass feature is activated, the multifunction switch routes the signal back to the SJB. The SJB then provides voltage to the high beams.

Vehicles equipped with High Intensity Discharge (HID) headlamps utilize a shutter within the headlamp assembly to increase the beam pattern. When the flash-to-pass feature is activated, the SJB activates the low beams and the shutters momentarily (less than 0.5 seconds).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Multifunction switch
- SJB



PINPOINT TEST G: THE FLASH-TO-PASS FEATURE 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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G1 CHECK THE HIGH BEAM OPERATION


- Ignition OFF.
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position.
- Do the high beams illuminate?

Yes
GO to G2.

No
Go To Pinpoint Test B. Pinpoint Test B: Both High Beams Are Inoperative

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G2 CHECK THE INPUT FROM THE MULTIFUNCTION SWITCH


- Place the headlamp switch in the OFF position.
- Disconnect: SJB C2280b.
- Place the multifunction switch in the FLASH-TO-PASS position.
- Measure the resistance between the SJB C2280b-40, circuit 1395 (RD/PK), harness side and the SJB C2280b-4, circuit 1396 (VT/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to G4.

No
GO to G3.

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G3 CHECK CIRCUIT 1395 (RD/PK) FOR AN OPEN


- Disconnect: Multifunction Switch C202.
- Measure the resistance between the multifunction switch C202-9, circuit 1395 (RD/PK), harness side and the SJB C2280b-40, circuit 1395 (RD/PK), harness side.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new multifunction switch. TEST the system for normal operation.

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

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G4 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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