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.

CIRCUIT OPERATION
The power window system is powered by a 20 amp circuit breaker located in the junction block cavity 19. This circuit breaker also feeds the power sun roof.

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 switch. This circuit is the feed for the entire system. The ground path for the power windows is on the Z1 circuit and terminates at the instrument panel left side cowl.

A LOCK-OUT feature is provided on the driver's door window switch. When this feature is engaged the other windows in the system will not operate.

All 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, except when the LOCK-OUT feature has been selected from the drivers door switch. The L.E.D.'s located in the driver's door switch will always be illuminated regardless of switch 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.

Left Front Window
When the operator selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q21. Circuit Q21 connects from the switch to the power window motor. Ground for the motor is supplied on the Q11 circuit back to the switch. A bus bar, internal to the switch, connects the Q11 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 Q11 is the feed, and circuit Q21 is the ground.

Right Front Window
When the DRIVER selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q26. Circuit Q26 connects from the drivers door switch to the right front door switch. Power is passed through this switch to circuit Q22. The Q22 circuit then connects to the right front window motor.

Ground for the window motor is supplied on the Q12 circuit back to the right door switch. Circuity internal to the switch then passes the ground to circuit Q16. Circuit Q16 connects from the right front door switch to the master switch. 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. Circuits Q16 and Q12 are the feeds, and circuits Q22 and Q26 are the grounds.

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 Q1 circuit from the driver's master switch 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 circuit Q22 is the ground.

Left Rear Window
When the DRIVER selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q27. Circuit Q27 connects from the drivers door switch to the left rear door switch. Power is passed through this switch to circuit Q23. The Q23 circuit then connects to the left rear window motor.

Ground for the window motor is supplied on the Q13 circuit back to the left rear door switch. Circuity internal to the switch then passes the ground to circuit Q17. Circuit Q17 connects from the left rear door switch 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. Circuits Q17 and Q13 are the feeds, and circuits Q23 and Q27 are the grounds.

If the switch is being operated from the LEFT REAR door, and the operator is requesting window DOWN operation, power is supplied on the Q1 circuit from the driver's master switch circuit through the switch to the Q23 circuit.

Ground for the motor is supplied on the Q13 circuit through the switch and back to the master switch on circuit Q17. 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 Q13 is the power and circuit Q23 is the ground.

Right Rear Window
When the DRIVER selects window DOWN operation power is supplied on the F21 circuit through the switch to circuit Q28. Circuit Q28 connects from the drivers door switch to the right rear door switch. Power is passed through this switch to circuit Q24. The Q24 circuit then connects to the right rear window motor.

Ground for the window motor is supplied on the Q14 circuit back to the right rear door switch. Circuity internal to the switch then passes the ground to circuit Q15. Circuit Q18 connects from the right rear door switch 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. Circuits Q15 and Q14 are the feeds, and circuits Q24 and Q28 are the grounds.

If the switch is being operated from the RIGHT REAR door, and the operator is requesting window DOWN operation, power is supplied on the Q1 circuit from the driver's master switch circuit through the switch to the Q24 circuit.

Ground for the motor is supplied on the Q14 circuit through the switch and back to the master switch on circuit Q18. 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 Q14 is the power and circuit Q24 is the ground.