Pinpoint Test M: The Ambient Lighting Is Inoperative
Interior Lighting
Pinpoint Test M: The Ambient Lighting Is Inoperative - MKZ
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
The Interior Lighting Control Module (ILCM) 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 select switch is used to cycle through the 7 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.
The ILCM (Interior Lighting Control Module) sends a voltage signal to the ambient lighting select switch. When the ambient lighting switch (a momentary contact switch) is pressed, the voltage signal is routed to ground indicating a request for the module to cycle the ambient lighting to the next color setting.
- DTC B2B18 (Ambient Light Switch Input Fault)- a continuous and on-demand DTC that sets when the ILCM (Interior Lighting Control Module) detects a short to ground from the ambient lighting select switch input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ambient lighting harness
- Ambient lighting select switch
- ILCM (Interior Lighting Control Module)
PINPOINT TEST M : THE AMBIENT LIGHTING IS INOPERATIVE - MKZ
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
M1 CHECK FOR COMMUNICATION TO THE ILCM (Interior Lighting Control Module)
- Enter the following diagnostic mode on the scan tool: ILCM (Interior Lighting Control Module) DataLogger.
- Carry out the network test using the scan tool.
Does the scan tool communicate with the ILCM (Interior Lighting Control Module)?
Yes
GO to M2.
No
REFER to Information Bus.
M2 CHECK THE INPUT FROM THE AMBIENT LIGHTING SWITCH
- Enter the following diagnostic mode on the scan tool: ILCM (Interior Lighting Control Module) DataLogger.
- While pressing and releasing the ambient lighting switch, monitor the ILCM (Interior Lighting Control Module) ambient lighting select switch PID (AmbiColor).
Does the PID read active with the switch pressed and idle with the switch released?
Yes
GO to M8.
No
If the PID always reads active, GO to M3.
If the PID always reads idle, GO to M4.
M3 CHECK THE AMBIENT LIGHTING SWITCH FOR A SHORT TO GROUND
- Disconnect: Ambient Lighting Switch C2306.
- Enter the following diagnostic mode on the scan tool: ILCM (Interior Lighting Control Module) DataLogger.
- Monitor the ILCM (Interior Lighting Control Module) ambient lighting select switch PID (AmbiColor).
Does the PID still read active?
Yes
GO to M4.
No
INSTALL a new ambient lighting select switch. REFER to Ambient Lighting Switch . TEST the system for normal operation.
M4 CHECK THE AMBIENT LIGHTING SELECT SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: ILCM (Interior Lighting Control Module) C2301.
- Measure the resistance between the ILCM (Interior Lighting Control Module) C2301-8, circuit CPL60 (WH/BN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to M5.
No
REPAIR circuit CPL60 (WH/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
M5 BYPASS THE AMBIENT LIGHTING SELECT SWITCH
- Ignition OFF.
- Disconnect: Ambient Lighting Select Switch C2306.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: ILCM (Interior Lighting Control Module) DataLogger.
- Monitor the ILCM (Interior Lighting Control Module) ambient lighting select switch PID (AmbiColor).
- Connect a fused jumper wire between the ambient lighting select switch C2306-2, circuit CPL60 (WH/BN), harness side and ground.
Does the PID read active?
Yes
GO to M6.
No
GO to M7.
M6 BYPASS THE AMBIENT LIGHTING SELECT SWITCH USING THE CONNECTOR GROUND
- Enter the following diagnostic mode on the scan tool: ILCM (Interior Lighting Control Module) DataLogger.
- Monitor the ILCM (Interior Lighting Control Module) ambient lighting select switch PID (AmbiColor).
- Connect and remove a fused jumper wire between the ambient lighting switch C2306-2, circuit CLN60 (BN/YE), harness side and the ambient lighting switch C2306-6, circuit GD908 (BK), harness side.
Does the PID read active?
Yes
REMOVE the jumper wire. INSTALL a new ambient lighting switch. REFER to Ambient Lighting Switch . TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit GD908 (BK) for an open. TEST the system for normal operation.
M7 CHECK THE AMBIENT LIGHTING SELECT SWITCH INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: ILCM (Interior Lighting Control Module) C2301.
- Measure the resistance between the ILCM (Interior Lighting Control Module) C2301-8, circuit CLN60 (BN/YE), harness side and the ambient lighting select switch C2306-2, circuit CLN60 (BN/YE), harness side.
Is the resistance less than 5 ohms?
Yes
GO to M8.
No
REPAIR circuit CLN60 (BN/YE) for an open. TEST the system for normal operation.
M8 CHECK THE AMBIENT LIGHTING RETURN CIRCUIT
- Ignition OFF.
- Check the diode circuits between the ILCM (Interior Lighting Control Module) , harness side as follows:
Connector-Pin/Circuit Connector-Pin/Circuit C2301-4 CLN44 (OG) C2301-20 RLN44 (BN) C2301-3 CLN45 (GN) C2301-20 RLN44 (BN) C2301-6 CLN46 (BU) C2301-20 RLN44 (BN) C2301-5 CLN57 (WH) C2301-20 RLN44 (BN)
Does the meter indicate the circuit is good?
Yes
GO to M9.
No
REPAIR circuit RLN44 (BU) for an open. TEST the system for normal operation.
M9 CHECK FOR CORRECT ILCM (Interior Lighting Control Module) OPERATION
- Disconnect the ILCM (Interior Lighting Control Module) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ILCM (Interior Lighting Control 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 ILCM (Interior Lighting Control Module). REFER to Interior Lighting Control Module (ILCM) . 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.