GM Service Manual Online
For 1990-2009 cars only

LH Window Switch

The battery voltage is applied from the WINDOWS circuit breaker through CKT 42 (RED) to the accessory time delay relay. The accessory time delay relay supplies voltage through CKT 70 (PNK) to the LH window switch under the following conditions:

    • The ignition is in the RUN position.
    • The retained accessory power (RAP) is active.

When an UP switch on the LH window switch is operated, the battery voltage is applied to the power window motor. The power window motor is grounded through the DOWN contacts of the LH window switch to G204. The motor runs in order to drive the power window up. When a DOWN switch in the LH window switch is operated, the battery voltage is applied to the power window motor in the opposite direction. The power window motor is grounded through the UP contacts in the LH window switch to G204. The motor runs in order to drive the power window down.

Express Down Feature

The express down feature fully opens the left front power window automatically. This feature is activated by momentarily pressing the LH window switch past the first detent. If the UP button is pressed while the power window is in the express mode, the power window stops. When the express mode is activated, the LH window switch applies the voltage to the left front power window motor through CKT 165 (BRN). This action causes the motor to run. When the motor reaches the full-down position, a motor stall is detected by the LH window switch. This condition turns OFF the voltage to the motor.

RH Window Switch

The battery voltage is applied from the WINDOWS circuit breaker through CKT 42 (RED) to the accessory time delay relay. The accessory time delay relay supplies the voltage through CKT 70 (PNK) to the RH window switch under the following conditions:

    • The ignition is in the RUN position.
    • The RAP is active.

When the UP switch is pressed, the voltage is applied to one terminal of the power window motor through CKT 666 (DK BLU). Ground is applied to the opposite terminal of the power window motor from the LH window switch through the right front power window switch on the following circuits:

    • CKT 167 (TAN)
    • CKT 667 (BRN)

When the DOWN switch is pressed, the voltage is applied to one terminal of the power window motor through CKT 667 (BRN). Ground is applied to the opposite terminal of the power window motor from the LH window switch through the RH window switch on the following circuits:

    • CKT 166 (LT BLU)
    • CKT 666 (DK BLU)