Pinpoint Test B: A Single Power Window Is Inoperative - LH Front Window

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE POWER WINDOW DOWN OPERATION
- Ignition OFF.
- Disconnect: LH Front Window Motor C524.
- Ignition ON.
- While operating the LH front window control switch, measure the voltage between LH front window motor C524-2, circuit CPW11 (BU/GY), harness side and LH front window motor C524-1, circuit CPW10 (YE/VT), harness side.
  
  Fig 1: Checking Circuits CPW20 (WH/OG) And CPW19 (VT) For Voltage And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts while operating the LH front window control switch in the down direction?
- Yes: INSTALL a new window regulator and motor. REFER to WINDOW REGULATOR - FRONT DOOR . TEST the system for normal operation.
- No: GO to B2 .

B2 CHECK CIRCUITS CPW11 (BU/GY) AND CPW10 (YE/VT) FOR AN OPEN

Ignition OFF.
Disconnect: LH Front Window Control Switch C504A.

Measure the resistance between LH front window control switch, harness side and LH front window motor, harness side using the following chart:

LH FRONT WINDOW CONTROL SWITCH REFERENCE

LH Front Window Motor	Circuit	LH Front Window Control Switch
C524-2	CPW11 (BU/GY)	C504A-5
C524-1	CPW10 (YE/VT)	C504A-1

Fig 2: Checking Circuits CPW11 (BU/GY) And CPW10 (YE/VT) For An Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes: INSTALL a new LH front window control switch. REFER to WINDOW CONTROL SWITCH . TEST the system for normal operation.
No: REPAIR the circuit(s) in question. TEST the system for normal operation.