Pinpoint Test D: A Single Power Window Is Inoperative - MKZ, LH Front

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. 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.

D1 CHECK THE POWER TO THE MASTER WINDOW CONTROL SWITCH
- Disconnect: Master Window Control Switch C535A.
- Ignition ON.
- Measure the voltage between master window control switch C535A-3, circuit CBP41 (BU), harness side and ground.
  
  Fig 1: Measuring Voltage Between Master Window Control Switch C535A-3, Circuit CBP41 (BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : Go to D2.
- No : VERIFY Smart Junction Box (SJB) fuse 41 (15A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short. DE-INITIALIZE then INITIALIZE the front window motor. Refer to WINDOW MOTOR INITIALIZATION in this service information. TEST the system for normal operation.
D2 CHECK THE VOLTAGE TO THE POWER WINDOW MOTOR
- Ignition OFF.
- Disconnect: LH Front Power Window Motor C540.
- Measure the voltage between LH front power window motor C540-4, circuit SBP01 (RD), harness side and ground.
  
  Fig 2: Checking The Voltage To The Power Window Motor
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : Go to D3.
- No : VERIFY SJB fuse 1 (30A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the SYSTEM WIRING DIAGRAMS article, to identify the possible causes of the circuit short. DE-INITIALIZE, then INITIALIZE the LH front window motor. Refer to WINDOW MOTOR INITIALIZATION in this service information. TEST the system for normal operation.
D3 CHECK THE LH FRONT POWER WINDOW MOTOR GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between LH front power window motor C540-3, circuit GD126 (BK/WH), harness side and ground.
  
  Fig 3: Checking The Front Power Window Motor Ground Circuit For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : Go to D4.
- No : REPAIR the circuit. DE-INITIALIZE then INITIALIZE the LH front window motor. Refer to WINDOW MOTOR INITIALIZATION in this service information. TEST the system for normal operation.
D4 CHECK THE MASTER WINDOW CONTROL SWITCH-TO-LH FRONT POWER WINDOW MOTOR CIRCUITS FOR AN OPEN
- Measure the resistance between LH front power window motor C540-1, circuit CPW10 (YE/VT), harness side and master window control switch C535A-8, circuit CPW10 (YE/VT), harness side.
  
  Fig 4: Measuring Resistance Between LH Front Power Window Motor C540-1, Circuit CPW10 (YE/VT) And Master Window Control Switch C535A-8, Circuit CPW10 (YE/VT)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between LH front power window motor C540-6, circuit CPW11 (BU/GY), harness side and master window control switch C535A-4, circuit CPW11 (BU/GY), harness side.
  
  Fig 5: Measuring Resistance Between LH Front Power Window Motor C540-6, Circuit CPW11 (BU/GY) And Master Window Control Switch C535A-4, Circuit CPW11 (BU/GY)
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : Go to D5.
- No : REPAIR circuit CPW10 (YE/VT) or CPW11 (BU/GY) for an open. DE-INITIALIZE then INITIALIZE the LH front window motor. Refer to WINDOW MOTOR INITIALIZATION in this service information. TEST the system for normal operation.
D5 CHECK THE MASTER WINDOW CONTROL SWITCH
- Carry out the master window control switch component test. Refer to MASTER WINDOW CONTROL SWITCH - FUSION/MILAN WITHOUT PASSENGER ONE TOUCH article or MASTER WINDOW CONTROL SWITCH - FUSION/MILAN WITH PASSENGER ONE TOUCH article or MASTER WINDOW CONTROL SWITCH - MKZ article for component testing.
- Did the master window control switch pass the component test?
- Yes : INSTALL a new LH front power window motor. Refer to WINDOW REGULATOR AND MOTOR - FRONT DOOR in this service information. INITIALIZE the LH front power window motor. Refer to WINDOW MOTOR INITIALIZATION in this service information. TEST the system for normal operation.
- No : INSTALL a new master window control switch. Refer to WINDOW CONTROL SWITCH in this service information. DE-INITIALIZE, then INITIALIZE the LH front power window motor. Refer to WINDOW MOTOR INITIALIZATION in this service information. TEST the system for normal operation.