Power Window Operation

CIRCUIT OPERATION
The power window system is powered by two 9 Amp Positive Temperature Coefficients (PTC's). Both of the PTC's are located in the junction block, PTC locations seven and eight.

The PTC's receive there feed from the ignition switch on the A31 circuit. The PTC's are HOT when the ignition switch is in the ACCESSORY or RUN position only.

Circuit F21 is the feed circuit from PTC 8 to the power window and vent switch that feeds the left side windows. Circuit F55 is the feed circuit from PTC 9 to the power window and vent switch that feeds the right side windows.

The ground path for the power windows 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 by circuit E2. This circuit is HOT when the headlamp switch is in the PARK or ON 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.

An express down module is used for the left windows. It allows the operator to latch the switch.