Pinpoint Test B: An Individual Courtesy Lamp Is Inoperative
WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- B1 CHECK THE COURTESY LAMP
- Key in OFF position.
- Disconnect: Suspect Interior Lamp
- Operate the courtesy lamps by opening the LF door.
- Measure the voltage between the suspect courtesy lamp, harness side as follows:
Location Connector-Pin/ Circuit Connector-Pin/ Circuit Front interior lamp
(MKZ)C930-3
CLN26 (BU)C930-1
GD139 (BK/YE)Front interior lamp
(Fusion/Milan)C918-1
CLN26 (BU)C918-2
GD139 (BK/YE)Rear interior lamp C901-1
CLN26 (BU)C901-2
GD139 (BK/YE)Luggage compartment lamp C4198-1
CLN26 (BU)C4198-2
GD139 (BK/YE) - Is the voltage greater than 10 volts?
- YES : INSTALL a new interior lamp for the suspect lamp. REFER to INTERIOR LAMP - FRONT or INTERIOR LAMP - REAR . TEST the system for normal operation.
- NO : Go to B2.
- B2 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE
- Measure the voltage between the suspect courtesy lamp, harness side and ground as follows:
Location Connector-Pin Circuit Front interior lamp
(MKZ)C930-3 CLN26 (BU) Front interior lamp
(Fusion/Milan)C918-1 CLN26 (BU) Rear interior lamp C901-1 CLN26 (BU) Luggage compartment lamp C4198-1 CLN26 (BU) - Is the voltage greater than 10 volts?
- YES : REPAIR circuit GD139 (BK/YE) for the lamp in question. TEST the system for normal operation.
- NO : REPAIR circuit CLN26 (BU) for the lamp in question. TEST the system for normal operation.
- Measure the voltage between the suspect courtesy lamp, harness side and ground as follows: