Pinpoint Test C: The Courtesy Lamps Do Not Illuminate From The Instrument Panel Dimmer Switch

Interior Lighting

Pinpoint Tests

Pinpoint Test C: The Courtesy Lamps Do Not Illuminate From The Instrument Panel Dimmer Switch

Refer to Wiring Diagram Set 71 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Cluster and Panel Illumination for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) monitors the instrument panel dimmer switch status to determine if the courtesy lamps are requested. When the instrument panel dimmer switch is rotated to the DOME LAMP position, the SJB supplies voltage to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Instrument panel dimmer switch
- SJB


PINPOINT TEST C: THE COURTESY LAMPS DO NOT ILLUMINATE FROM THE INSTRUMENT PANEL DIMMER SWITCH

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 DIMMABLE BACKLIGHTING OPERATION

- Place the headlamp switch in the PARKING LAMPS ON position.
- Monitor the instrument panel dimmable backlighting while rotating the instrument panel dimmer switch from full on to full off.
- Does the dimmable backlighting intensity change with the instrument panel dimmer switch position?

Yes
GO to C2.

No
REFER to Instrument Cluster and Panel Illumination Testing and Inspection.

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C2 BYPASS THE INSTRUMENT PANEL DIMMER SWITCH

- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C2065.
- Connect a fused jumper wire between the instrument panel dimmer switch C2065-5, circuit CLN17 (BN), harness side and the instrument panel dimmer switch C2065-4, circuit CLN04 (BU/BN), harness side.





- Do the courtesy lamps illuminate?

Yes
REMOVE the jumper wire. INSTALL a new instrument panel dimmer switch. REFER to Instrument Cluster and Panel Illumination Service and Repair. TEST the system for normal operation.

No
REMOVE the jumper wire. GO to C3.

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C3 CHECK THE DOME LAMP REQUEST INPUT CIRCUIT FOR AN OPEN

- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-51, circuit CLN17 (BN), harness side and the instrument panel dimmer switch C2065-5, circuit CLN17 (BN), harness side.





- Is the resistance less than 5 ohms?

Yes
GO to C4.

No
REPAIR circuit CLN17 (BN) for an open. TEST the system for normal operation.

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C4 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 Multifunction Electronic Modules Service and Repair. 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. CLEAR the DTCs. REPEAT the self-test.

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