GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Grand Am 🢒 Body and Accessories 🢒 Doors 🢒 Outside Mirrors Circuit Description

The outside mirror has 2 reversible motors:

    • One motor adjusts the mirror view up and down.
    • One motor adjusts the mirror view right and left.

The driver operates 4  switches that control the polarity of the voltage to the motors. The mirror select switch directs these control voltages to either the right or left outside mirror.

With the switches in the positions shown in the schematic, the left outside mirror is being controlled. When the up-down switch is moved DOWN, battery voltage from CKT 1732 is applied to the CKT 1499 and the up-down motor in the left outside mirror. The left outside mirror up-down switch supplies a path to ground through the following locations:

    • CKT 88
    • The DOWN contacts of the up-down switch
    • CKT 150

The left mirror up-down motor moves the mirror down.

If you push the mirror control switch to the UP position, the same motor receives voltage and CKT 1499 is grounded. The motor runs in the opposite direction.

The left left-right motor operates in a similar manner when the joystick moves the left-right switch to the LEFT position. CKT 1499 gets battery voltage and the CKT  81 is grounded through the left-right switch.

The right outside mirror works the same way as the left outside mirror when you move the mirror select switch to the right position and operate the joystick.

Power Output Diagnostic Mode

The power output diagnostic mode in the multi-function alarm module runs a quick inspection of the operation on the following controls:

    • The parasitic power control
    • The courtesy lamp control
    • The inadvertent power control outputs

This diagnostic mode is activated after all of the following actions have been performed:

    • Close all the doors.
    • Set the park brake.
    • Turn the interior lamps on using the panel dimmer switch.
    • Turn the ignition switch to RUN and, before 15 seconds pass, perform these steps:
       - Open the right the front door.
       - Cycle the headlamp switch from PARK to OFF 3 times.

During normal operation, where no trouble is found, the multi-function alarm module will flash the interior lamps for approximately 1 minute and return to the normal operation. If a short is found in the inadvertent output circuit (CKT 1733), the multi-function alarm module will chime once every 3 seconds.