Windows: Description and Operation

INTRODUCTION
Front and rear door window lift motors are of the permanent magnet type. A battery positive and negative connection to either of the two motor terminals will cause the motor to rotate in one direction. Reversing current through these same two connections will cause the motor to rotate in the opposite direction.

Each individual motor is grounded through the master switch.

SYSTEM OPERATION
Window Drop Relay Assembly
The Window Drop Relay Assembly allows the windows to be automatically lowered when the convertible top is raised or lowered. The window timer module will lower the windows for 280 to 380 Milliseconds when the top switch is pressed up or down. This will lower the windows approx 1 to 3 Inches so that the windows are clear of the top while raising or lowering.

CIRCUIT OPERATION
Normal

NOTE: The power window system used in this vehicle is different from other vehicles in that a window timer module along with window down relays are used. This module allows for normal window operation when the window switches are activated. However, when the power top switch is activated the module will partially lower all windows

The power window system is powered by a 20 Amp circuit breaker located in the junction block cavity 19.This circuit breaker also supplies power to the window down module and normally OPEN contacts of the window down relays.

The circuit breaker receives its feed from the ignition switch on the A22 circuit. This circuit breaker is HOT when the ignition switch is in the RUN position only.

Circuit F21 is the feed circuit from the circuit breaker to the power window switches. The ground path for the power windows, window timer module, and window down relays is on the Z1 circuit and terminates at the instrument panel left side cowl.

Both of the door switches have a Light Emitting Diode (L.E.D.) located inside of the switch. This diode allows the operator to see the switch when it is dark. The diodes are powered at all times when the ignition switch is in the RUN position.

Resistors and diodes internal to the switches are used for the L.E.D's. No attempt should be made to repair these items. If the L.E.D. is not working, the switch should be replaced.

Each window motor has an internal circuit breaker to protect the motor from excessive electrical loads. This circuit breaker is not serviceable.

Left Front Window
When the operator selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q29. Circuit Q29 connects from the switch to the left power window down relay The feed is passed through the normally CLOSED contacts in the relay to circuit Q21. Circuit Q21 connects from the relay to the motor. Ground for the motor is supplied on circuit Q11 back to the master switch to the Z1 ground circuit.

For window UP operation the circuits are reversed. Circuit Q11 is the feed and circuits Q21 and Q29 are the ground.

Right Front Window
When the DRIVER selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q30. Circuit Q30 connects from the drivers door switch to the right front down relay. The feed is passed through the normally CLOSED contacts in the relay to circuit Q26. Circuit Q26 connects to the passenger switch. The motor current then runs through the switch to circuit Q22 which connects to the motor. The ground returns through circuit Q12 through the passengers switch contacts to circuit Q16. Circuit Q16 connects to the master switch then to the Z1 ground circuit.

For window UP operation the circuits are reversed. Circuit Q16 is the feed and circuits Q26 and Q30 are the ground.

If the switch is being operated from the PASSENGER'S front door, and the operator is requesting window DOWN operation, power is supplied on the F21 circuit through the switch to the Q22 circuit.

Ground for the motor is supplied on the Q12 circuit through the switch and back to the master switch on circuit Q16. A bus bar, internal to the switch, connects the Q16 circuit to the Z1 circuit. The Z1 circuit is terminated at the instrument panel left side cowl.

For window UP operation, the circuits are reversed. Circuit Q12 is the power and circuits Q22 and Q26 are the ground.

Left Rear Window
When the DRIVER selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q31. Circuit Q31 connects from the drivers door switch to the window timer module. The power is passed though the normally CLOSED contacts in the module to circuit Q27. Circuit Q27 connects from the module to the motor.

Ground for the window motor is supplied on the Q17 circuit. Circuit Q17 connects from the left rear window motor to the master switch. A bus bar, internal to the switch, connects the Q17 circuit to the Z1 circuit. The Z1 circuit is terminated at the instrument panel left side cowl.

For window UP operation the circuits are reversed. Circuit Q17 is the feed, and circuit Q31 and circuit Q27 are the ground.

Right Rear Window
When the DRIVER selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q32. Circuit Q32 connects from the drivers door switch to the window timer module. The power is passed though the normally CLOSED contacts in the module to circuit Q28. Circuit Q28 connects from the module to the motor.

Ground for the window motor is supplied on the Q18 circuit. Circuit Q18 connects from the right rear window motor to the master switch. A bus bar, internal to the switch, connects the Q18 circuit to the Z1 circuit. The Z1 circuit is terminated at the Instrument Panel left side cowl.

For window UP operation the circuits are reversed. Circuit Q18 is the feed, and circuit Q32 and circuit Q28 are the ground.

With Power Top

NOTE: The power windows on this vehicle operate automatically in the down mode when the power top switch is activated. For regular power window operation refer to the previous circuit description.

The power window system on this vehicle utilizes a pair of external relays 2. and a window timer module located in the left door to control the operation of the windows when the power top is activated.

Power for the window timer module is supplied on circuit P5 or P6. The F21 circuit supplies power for the power window switches, and the contact side of the power window relays. Ground for the module is supplied on circuit Z1.

When the power top switch is activated circuit P6 for top UP or P5 for top DOWN, sends a voltage signal to the window timer module. The window timer module then provides voltage to the coil side of the relays. This causes the normally OPEN contacts in the relays to CLOSE connecting power to the DOWN side of watch window motor. All windows then operate in the DOWN mode for a pre-determined length of time.