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

Glass, Frames and Mechanisms

Pinpoint Tests

Pinpoint Test C: A Single Power Window is Inoperative - MKZ, LH Front

Refer to Wiring Diagram Set 100, Power Windows for schematic and connector information. Diagrams By Number

NOTE: A new LH front power window motor will not operate in one-touch up or one-touch down mode until initialized. Refer to Window Motor Initialization .

NOTE: The LH front power window motor must be initialized whenever a new motor is installed.

NOTE: The LH front power window motor must be de-initialized, then initialized whenever the LH front window motor is removed from the window regulator drum housing, a new window regulator is installed, a new window glass is installed, a new top run is installed or for any operation in which grease or lubricants are applied to the window regulator or glass run.

Normal Operation

Under normal operation, the LH front power window control switch receives power from the delay accessory relay through circuit CBP02 (GN). The LH window motor receives battery power through circuit SBB34 (YE/RD) at all times and ground through circuit GD126 (BK/WH). When the LH front window control switch is operated in the UP position, the LH front window motor receives a voltage signal through circuit CPW11 (BU/GY). When the LH front window control switch is operated in the DOWN position, the LH front window motor receives a voltage signal through circuit CPW10 (YE/VT). When the LH front window motor receives a ground signal on circuit CPW29 (VT/GY), the LH front window motor will enter one-touch up/down mode.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- LH front window motor
- LH front window control switch
- LH front window motor not initialized



PINPOINT TEST C: A SINGLE POWER WINDOW IS INOPERATIVE - MKZ, LH FRONT

-------------------------------------------------
C1 CHECK THE POWER TO THE WINDOW MOTOR


- Ignition OFF.
- Disconnect: LH Front Window Motor C540.
- Measure the voltage between LH front window motor C540-4, circuit SBB34 (YE/RD), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to C2.

No
VERIFY Battery Junction Box (BJB) fuse 34 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams 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.

-------------------------------------------------
C2 CHECK THE LH FRONT WINDOW MOTOR GROUND


- Ignition OFF.
- Measure the resistance between LH front window motor C540-3, circuit GD126 (BK/WH), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to C3.

No
REPAIR the circuit. DE-INITIALIZE then INITIALIZE the LH front window motor. REFER to Window Motor Initialization . TEST the system for normal operation.

-------------------------------------------------
C3 CHECK THE LH FRONT WINDOW CONTROL SWITCH-TO-LH FRONT WINDOW MOTOR FEEDS


- Disconnect: LH Front Window Control Switch C535A.
- Measure the resistance between LH front window motor C540-1, circuit CPW10 (YE/VT), harness side and LH front window control switch C535A-7, circuit CPW10 (YE/VT), harness side.




- Measure the resistance between LH front window motor C540-5, circuit CPW29 (VT/GY), harness side and LH front window control switch C535A-8, circuit CPW29 (VT/GY), harness side.




- 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.




- Are the resistances less than 5 ohms?

Yes
GO to C4.

No
REPAIR the circuit. DE-INITIALIZE then INITIALIZE the LH front window motor. REFER to Window Motor Initialization . TEST the system for normal operation.

-------------------------------------------------
C4 CHECK THE LH FRONT WINDOW CONTROL SWITCH


- Carry out the Master Window Adjust Switch Component Test.

- Did the window control switch pass the component test?

Yes
INSTALL a new LH front window motor. REFER to Glass, Frames and Mechanisms - Exploded View, Front Door Glass, Frames and Mechanisms - Exploded View, Front Door and Window Regulator and Motor - Front Door Window Regulator and Motor - Front Door. 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 Window Control Switch Service and Repair. INITIALIZE the LH front window motor. REFER to Window Motor Initialization . TEST the system for normal operation.

-------------------------------------------------