Pinpoint Test A: All Power Windows Are Inoperative - MKZ

Glass, Frames and Mechanisms

Pinpoint Tests

Pinpoint Test A: All Power Windows are Inoperative - MKZ

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

Normal Operation

Under normal operation, the LH front power window control switch receives power through circuits CBP02 (GN) and CPW30 (GY/YE), which is the accessory delay relay output from the Smart Junction Box (SJB). The accessory delay relay is integral to the SJB module. The LH and RH front power window motors each have their own separate power feeds and grounds and do not share any circuits with the LH or RH rear power window motors, except through the master window control switch.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- LH front window control switch
- SJB



PINPOINT TEST A: ALL POWER WINDOWS ARE INOPERATIVE - MKZ

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A1 CHECK CIRCUITS CBP02 (GN) AND CPW30 (GY/YE) FOR VOLTAGE


- Disconnect: LH Front Window Control Switch C535A.
- Disconnect: LH Front Window Control Switch C535B.
- Ignition ON.
- Measure the voltage between LH front window control switch C535A-3, circuit CBP02 (GN), harness side and ground; and between LH front window control switch C535B-3, circuit CPW30 (GY/YE), harness side and ground.




- Is the voltage greater than 10 volts for both measurements?

Yes
INSTALL a new LH front window control switch. REFER to Window Control Switch Service and Repair. TEST the system for normal operation.

No
VERIFY SJB fuse 12 (7.5A) is OK. If OK, GO to A2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.

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A2 CHECK CIRCUITS CBP02 (GN) AND CPW30 (GY/YE) FOR AN OPEN


- Ignition OFF.
- Disconnect: SJB C2280E.
- Measure the resistance between LH front window control switch C535A-3, circuit CBP02 (GN), harness side and SJB C2280E-25, circuit CBP02 (GN), harness side; and between LH front window control switch C535B-3, circuit CPW30 (GY/YE), harness side and SJB C2280E-4, circuit CPW30 (GY/YE), harness side.




- Are the resistances less than 5 ohms for both measurements?

Yes
Go To Pinpoint Test N to diagnose the accessory delay relay circuit. Pinpoint Test N: The Delayed Accessory is Inoperative/Does Not Operate Correctly

No
REPAIR the circuit. TEST the system for normal operation.

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