Pinpoint Test C: The Courtesy Lamps Do Not Turn On From The Instrument Panel Dimmer Switch
Interior Lighting
Pinpoint Tests
Pinpoint Test C: The Courtesy Lamps Do Not Turn On 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 from circuit CLN17 (BN) to determine if the courtesy lamps are requested. When the instrument panel dimmer switch is rotated to the DOME LAMP position, ground is supplied to circuit CLN17 (BN). When the request is detected, 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 TURN ON 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.
NOTE: Make sure the interior lamp switch is in the DOOR position before carrying out diagnostics.
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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 Panel, Gauges and Warning Indicators.
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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. 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. 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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