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/Autolamps for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) sends a reference signal to the multifunction switch through circuit CLF27 (GN/BN). When the multifunction switch is placed in the FLASH-TO-PASS position, the voltage signal is routed to ground. When the SJB detects a request for the flash-to-pass, the SJB sends voltage to the high beam headlamps.

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 VERIFY THE HIGH BEAM HEADLAMP OPERATION


- Ignition ON.
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position while observing the headlamps.
- Do the high beam headlamps 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 MULTIFUNCTION SWITCH


- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Connect a fused jumper wire between the multifunction switch C202-4, circuit CLF27 (GN/BN), harness side and the multifunction switch C202-8, circuit GD116 (BK/VT), harness side.




- Do the high beam headlamps illuminate?

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

No
REMOVE the jumper wire. GO to G3.

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G3 CHECK CIRCUIT CLF27 (GN/BN) FOR AN OPEN


- Disconnect: SJB C2280d.
- Measure the resistance between the multifunction switch C202-4, circuit CLF27 (GN/BN), harness side and the SJB C2280d-25, circuit CLF27 (GN/BN), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to G4.

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. REFER to Body Control Systems. 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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