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HOMESERVICE MANUALSCHEVROLET1993ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISWINDOWS AND GLASSWINDOWSDESCRIPTION AND OPERATION
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z
Windows: Description and Operation
1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Description and Operation
A permanent magnet (PM) motor operates each of the Power Windows. Each Motor raises or lowers the glass when voltage is supplied to it. The direction the Motor turns depends on the polarity of the supply voltage. The Switches control the supply voltage polarity.
The Master Door Lock/Power Window Switch Assembly controls both of the Motors. The RH Window Switch controls only the RH Window Motor.
Each Motor is protected by a built-in circuit breaker. If a Window Switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breaker resets automatically as it cools.
When the Ignition Switch is in RUN, battery voltage is supplied to the Master Door Lock/Power Window Switch Assembly, the PWR WDO Circuit Breaker, and the PNK wires. When any of the UP Switches are operated, battery voltage is supplied to the Window Motor through the DK BLU wire. The Window Motor is grounded through the DN contact. The Motor runs to drive the window up. When any of the DN Switches are operated, battery voltage is supplied to the Window Motor in the opposite direction through the BRN wire. The Window Motor is grounded through the UP contact. The Motor runs to drive the window down.
RH WINDOW SWITCH OPERATION
When the Ignition Switch is in RUN, battery voltage is supplied to the RH Window Switch through the PWR WDO Circuit Breaker and the PNK wires to terminal A. When the UP Switch in the RH Window Switch is operated, battery voltage is supplied to the RH Window Motor through the DK BLU wire. The Motor is grounded through the BRN wire, the DN contact in the RH Window Switch, the Tan wire and the DN contact in the Master Door Lock/Power Window Switch Assembly. The Motor runs to drive the window up. When the DN switch in the RH Window Switch is operated, battery voltage is supplied to the RH Window Motor in the opposite direction through the BRN wire. The Motor is grounded through the DK BLU wire, the UP contact in the RH Window Switch, the DK BLU/WHT wire and the UP contact in the Master Door Lock/Power Window Switch Assembly. The Motor runs to drive the Window down.
The Master Door Lock/Power Window Switch Assembly controls both of the Motors. The RH Window Switch controls only the RH Window Motor.
Each Motor is protected by a built-in circuit breaker. If a Window Switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breaker resets automatically as it cools.
When the Ignition Switch is in RUN, battery voltage is supplied to the Master Door Lock/Power Window Switch Assembly, the PWR WDO Circuit Breaker, and the PNK wires. When any of the UP Switches are operated, battery voltage is supplied to the Window Motor through the DK BLU wire. The Window Motor is grounded through the DN contact. The Motor runs to drive the window up. When any of the DN Switches are operated, battery voltage is supplied to the Window Motor in the opposite direction through the BRN wire. The Window Motor is grounded through the UP contact. The Motor runs to drive the window down.
RH WINDOW SWITCH OPERATION
When the Ignition Switch is in RUN, battery voltage is supplied to the RH Window Switch through the PWR WDO Circuit Breaker and the PNK wires to terminal A. When the UP Switch in the RH Window Switch is operated, battery voltage is supplied to the RH Window Motor through the DK BLU wire. The Motor is grounded through the BRN wire, the DN contact in the RH Window Switch, the Tan wire and the DN contact in the Master Door Lock/Power Window Switch Assembly. The Motor runs to drive the window up. When the DN switch in the RH Window Switch is operated, battery voltage is supplied to the RH Window Motor in the opposite direction through the BRN wire. The Motor is grounded through the DK BLU wire, the UP contact in the RH Window Switch, the DK BLU/WHT wire and the UP contact in the Master Door Lock/Power Window Switch Assembly. The Motor runs to drive the Window down.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.