Pinpoint Test K: The Ambient Lighting Is Inoperative
Interior Lighting
Pinpoint Test K: The Ambient Lighting Is Inoperative - Fusion/Milan
Refer to Wiring Diagram Set 89 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
When the ignition key is in the RUN or ACC position, the ambient lighting module supplies voltage and ground to the LEDs located in the floor console cup holders, storage tray, storage bin, door map pockets and the front and rear footwells. The ambient lighting switch is used to cycle through the 8 color combinations or to turn the ambient lighting feature off. There are 4 different color (red, blue, green and white) LEDs housed within each LED assembly.
When the ignition key is in the RUN or ACC position, the ambient lighting switch and the ambient lighting module receive voltage. When the ambient lighting switch (a momentary contact switch) is pressed, voltage is routed to the ambient lighting module indicating a request for the module to cycle the ambient lighting to the next setting.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Ambient lighting harness
- Ambient lighting switch
- Ambient lighting module
PINPOINT TEST K: THE AMBIENT LIGHTING IS INOPERATIVE - FUSION/MILAN
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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K1 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING MODULE
- Ignition OFF.
- Disconnect: Ambient Lighting Module C3256 .
- Ignition ON.
- Measure the voltage between the ambient lighting module C3256-1, circuit CBX07 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to K2.
No
VERIFY the Smart Junction Box (SJB) fuse 41 (15A) is OK. If OK, REPAIR the circuit CBX07 (GN/RD) for an open. TEST the system for normal operation. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
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K2 CHECK THE INPUT FROM THE AMBIENT LIGHTING SWITCH
- While pressing and releasing the ambient lighting switch, measure the voltage between the ambient lighting module C3256-2, circuit CLN54 (BN/YE), harness side and ground.
- Is the voltage greater than 10 volts with the switch pressed and 0 volts with the switch released?
Yes
GO to K6.
No
If voltage is always present, GO to K3.
If no voltage is present, GO to K4.
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K3 CHECK THE AMBIENT LIGHTING SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Traction Control/Ambient Lighting Switch C2304 .
- Ignition ON.
- Measure the voltage between the ambient lighting module C3256-2, circuit CLN54 (BN/YE), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit for a short to voltage. TEST the system for normal operation.
No
INSTALL a new traction control/ambient lighting switch. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.
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K4 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING SWITCH
- Ignition OFF.
- Connect: Ambient Lighting Module C3256 .
- Disconnect: Traction Control/Ambient Lighting Switch C2304 .
- Ignition ON.
- Measure the voltage between the ambient lighting switch C2304-5, circuit CBP41 (BU), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to K5.
No
VERIFY the SJB fuse 41 (15A) is OK. If OK, REPAIR the circuit for an open. TEST the system for normal operation. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
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K5 BYPASS THE AMBIENT LIGHTING SWITCH
- Connect and remove a fused jumper wire between the ambient lighting switch C2304-5, circuit CBP41 (BU), harness side and the ambient lighting switch C2304-4, circuit CLN54 (BN/YE), harness side.
- Do the ambient LEDs illuminate and cycle through a color change each time the jumper wire is connected and removed?
Yes
INSTALL a new traction control/ambient lighting switch. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.
No
REPAIR the circuit for an open. TEST the system for normal operation.
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K6 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING MODULE USING THE CONNECTOR GROUND
- Measure the voltage between the ambient lighting module C3256-1, circuit CBX07 (GN/RD), harness side and the ambient lighting module C3256-8, circuit GD908 (BK), harness side.
- Is the voltage greater than 10 volts?
Yes
GO to K7.
No
REPAIR the circuit for an open. TEST the system for normal operation.
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K7 CHECK THE AMBIENT LIGHTING HARNESS
- Ignition OFF.
- Check any of the diode circuits between the ambient lighting module, harness side as follows:
- Does the meter indicate the circuit is good?
Yes
GO to K8.
No
REPAIR or INSTALL a new ambient lighting harness. TEST the system for normal operation.
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K8 CHECK FOR CORRECT AMBIENT LIGHTING MODULE OPERATION
- Disconnect the ambient lighting module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ambient lighting module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ambient lighting module. REFER to Ambient Lighting Module Ambient Lighting Module. 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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