Pinpoint Test I: An Individual Demand Lamp Is Inoperative
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- I1 CHECK FOR VOLTAGE TO THE DEMAND LAMP
- Ignition OFF.
- Disconnect: Suspect Demand Lamp.
- Ignition ON.
- Measure the voltage between the suspect demand lamp, harness side and ground as follows:VOLTAGE REFERENCE TABLE
Location Connector-Pin Circuit RH vanity mirror lamp C906-1 CLN09 (YE/GN) LH vanity mirror lamp C907-1 CLN09 (YE/GN) Front C930-2 CLN09 (YE/GN) Front (MKZ only) C9035-2 CLN09 (YE/GN) Rear (with moonroof) C921-3 CLN09 (YE/GN) Rear (without moonroof) C901-3 CLN09 (YE/GN) Glove compartment lamp C254-1 CLN09 (YE/GN) - Is the voltage greater than 10 volts?
- Yes: GO to I2.
- No: REPAIR the circuit in question. TEST the system for normal operation.
- I2 CHECK FOR VOLTAGE TO THE DEMAND LAMP USING THE CONNECTOR GROUND
- Measure the voltage between the inoperative demand lamp, harness side and ground as follows:VOLTAGE REFERENCE TABLE
Inoperative Lamp Connector-Pin/Circuit Connector-Pin/Circuit LH vanity mirror lamp C907-1 CLN09 (YE/GN) C907-2 GD139 (BK/YE) RH vanity mirror lamp C906-1 CLN09 (YE/GN) C906-2 GD139 (BK/YE) Front C930-2 CLN09 (YE/GN) C930-1 GD139 (BK/YE) Front (MKZ only) C9035-2 CLN09 (YE/GN) C9035-6 GD139 (BK/YE) Rear (with moonroof) C921-3 CLN09 (YE/GN) C921-2 GD139 (BK/YE) Rear (without moonroof) C901-3 CLN09 (YE/GN) C901-2 GD139 (BK/YE) - Is the voltage greater than 10 volts?
- Yes: INSTALL a new demand lamp for the suspect lamp. TEST the system for normal operation.
- No: REPAIR the circuit in question. TEST the system for normal operation.
- Measure the voltage between the inoperative demand lamp, harness side and ground as follows: