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

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) 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 WINDOW CONTROL SWITCH
- Disconnect: LH Front Window Control Switch C535A.
- Ignition ON.
- Measure the voltage between LH front window control switch C535A-3, circuit CBP41 (BU), harness side and ground.
  
  Fig 1: Measuring Voltage Between LH Front Window Control Switch C535A-3, Circuit CBP41 (BU), Harness Side & 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 appropriate 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 . TEST the system for normal operation.
D2 CHECK THE POWER TO THE WINDOW MOTOR
- Ignition OFF.
- Disconnect: LH Front Window Control Switch C535A LH Front Window Motor C540.
- Measure the voltage between LH front window motor C540-4, circuit SBP01 (RD), harness side and ground.
  
  Fig 2: Measuring Voltage Between LH Front Window Motor C540-4, Circuit SBP01 (RD), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts? 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 appropriate 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 . TEST the system for normal operation.
D3 CHECK THE LH FRONT WINDOW MOTOR GROUND
- Measure the resistance between LH front window motor C540-3, circuit GD126 (BK/WH), harness side and ground.
  
  Fig 3: Measuring Resistance Between LH Front Window Motor C540-3, Circuit GD126 (BK/WH), Harness Side & Ground
  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 . TEST the system for normal operation.
D4 CHECK THE LH FRONT WINDOW CONTROL SWITCH-TO-LH FRONT WINDOW MOTOR FEEDS
- Measure the resistance between LH front window motor C540-1, circuit CPW10 (YE/VT), harness side and LH front window control switch C535A-8, circuit CPW10 (YE/VT), harness side.
  
  Fig 4: Measuring Resistance Between LH Front Window Motor C540-1 & LH Front Window Control Switch C535A-8
  Courtesy of FORD MOTOR CO.
- Measure the resistance between LH front window motor C540-6, circuit CPW11 (BU/GY), harness side and LH front window control switch C535A-4, circuit CPW11 (BU/GY), harness side.
  
  Fig 5: Measuring Resistance Between LH Front Window Motor C540-6 & LH Front Window Control Switch C535A-4
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to D5.
- No: REPAIR the circuit. DE-INITIALIZE then INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.
D5 CHECK THE LH FRONT WINDOW CONTROL SWITCH
- Carry out the LH front window control switch component test.
  Refer to COMPONENT TESTING - EXCEPT HYBRID and COMPONENT TESTING - HYBRID for component testing.
- Did the LH front window control switch pass the component test?
- Yes: INSTALL a new LH front window motor. REFER to Removal and Installation . INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.
- No: INSTALL a new LH front window control switch. REFER to Removal and Installation . DE-INITIALIZE, then INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.