Pinpoint Test F : The One-Touch Up/Down Feature Is Inoperative - LF
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.
- F1 CHECK FOR POWER (B+) LOSS DURING LF WINDOW OPERATION
- Verify if power (B+) was lost during LF window operation.
Was power (B+) lost while LF window was in operation?
Yes LOWER the LF window to the full OPEN position. MAKE SURE the window glass stalls in the full DOWN position for at least a half second. Normal functionality should resume. TEST the system for normal operation. No GO to F2. - F2 INITIALIZE THE LF MOTOR
- Carry out the LF window motor initialization procedure. Refer to Window Motor Initialization .
Are the one-touch up/down functions operating correctly?
Yes Repair is complete. No GO to F3. - F3 CHECK THE MASTER WINDOW CONTROL SWITCH
- Carry out the front window switch component test. Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for component testing.
Did the front window switch pass the component test?
Yes For Expedition, GO to F4. For Navigator, GO to F5. No INSTALL a new master window control switch. REFER to Window Control Switch . TEST the system for normal operation. - F4 CHECK THE FRONT WINDOW SWITCH TO LF MOTOR FEEDS
- Ignition OFF.
- Disconnect: Master Power Window Control Switch C504A.
- Disconnect: LF Power Window Motor C518.
- Measure the resistance between LF power window motor C518, harness side and master window control switch C504A, harness side using the following chart:
LF Power Window Motor Circuit Master Window Control Switch C518-7 CPW11 (BU/GY) C504A-5 C518-4 CPW10 (YE/VT) C504A-1 C518-6 CPW29 (VT/GY) C504A-7
Are the resistances less than 3 ohms?
Yes GO to F6. No REPAIR the affected circuit. DE-INITIALIZE, then INITIALIZE the LF power window motor. REFER to Window Motor Initialization . TEST the system for normal operation. - F5 CHECK THE FRONT WINDOW SWITCH TO LF MOTOR FEEDS
- Ignition OFF.
- Disconnect: Master Power Window Control Switch C535A.
- Disconnect: LF Power Window Motor C518.
- Measure the resistance between LF power window motor C540, harness side and master window control switch C535A, harness side using the following chart:
LF Power Window Motor Circuit Master Window Control Switch C518-7 CPW11 (BU/GY) C535A-4 C518-4 CPW10 (YE/VT) C535A-7 C518-6 CPW29 (VT/GY) C535A-8
Are the resistances less than 3 ohms?
Yes GO to F6. No REPAIR the affected circuit. DE-INITIALIZE, then INITIALIZE the LF power window motor. REFER to Window Motor Initialization . TEST the system for normal operation. - F6 CHECK FOR AN INTERMITTENT GROUND CONNECTION
- Ignition OFF.
- Measure the resistance between LF power window motor C518-8 , circuit GD143 (BK/VT), harness side and ground.
- Wiggle the harness while measuring the resistances.
Is the resistance less than 3 ohms?
Yes GO to F7. No REPAIR the circuit. DE-INITIALIZE, then INITIALIZE the LF power window motor. REFER to Window Motor Initialization . TEST the system for normal operation. - F7 CHECK FOR INTERMITTENT POWER CONNECTIONS
- Ignition ON.
- Measure the voltage between LF power window motor C518-3 , circuit SBP01 (RD), harness side and ground; and between C518-2 , circuit CPB41 (BU), harness side and ground.
- Wiggle the harness while measuring the voltages.
Are the voltages greater than 11 volts?
Yes INSTALL a new LF power window motor. REFER to Window Regulator Motor - Front Door . INITIALIZE the LF power window motor. REFER to Window Motor Initialization . TEST the system for normal operation. No REPAIR the affected circuit. DE-INITIALIZE, then INITIALIZE the LF power window motor. REFER to Window Motor Initialization . TEST the system for normal operation.