DESCRIPTION & OPERATION
On all models except Riviera and Corvette, power operated side view mirrors are controlled by a switch on armrest for driver's mirror and a switch on instrument panel for passenger's side mirror.
On Riviera, driver's door switch controls both mirrors, with selector switch in base of control switch determining which mirror is operated. On Corvette, switches are located on center console next to driver.
Cadillac, Corvette and Reatta models also have a power mirror heating system which operates in conjunction with rear window defogger. When defogger is turned on, mirror base heats up through ground lead soldered to it. A thermistor in wiring circuit interrupts current flow when mirror base reaches 158°F (69°C) and turns off power to mirror.
Each power mirror assembly has 2 reversible motors. One motor moves the mirror up or down, and the other moves the mirror left or right. The voltage applied to motor terminals determines the direction mirror motor turns. When a mirror reaches its mechanical limit of travel, a self resetting circuit breaker opens the mirror control circuit to protect each motor from overload.
Grand Am & Skylark
- Test circuit fuse by operating horn. If neither mirror operates, check for battery voltage at center console outside mirror switch by connecting a test light between Orange wire and ground. If test light glows, connect test light between Orange wire and Black wire. If test light does not glow, check Orange and Black wire circuits.
- If left mirror does not operate, place mirror selector switch in left mirror position. Connect test light to Yellow and Lt. Green/Black terminals of outside mirror switch. Check the test light glows when mirror control switch is in up and down position.
- Connect a test light to Lt. Blue and White/Black terminals of outside mirror switch. Check that test light glows when mirror control switch is in left and right positions. If test light glows but mirror does not turn, check wiring and motor. If test light does not glow when switches are in position to energize its terminals, install a new outside mirror switch.
- If right mirror does not operate, place mirror selector switch in right mirror position. Connect test light to Yellow and Lt. Green terminals of outside mirror switch. Check that test light glows when mirror control switch is in up and down position.
- Connect test light to Lt. Blue/Black and White terminals of outside mirror switch. Check that test light glows when mirror control switch is in left and right position. If test light glows but mirror does not turn, check wiring and motor. If test light does not glow when switches are in position to energize its terminals, install a new outside mirror switch.
Camaro & Firebird
- Operate right side mirror and check voltage at right side mirror switch. With switch in up position Orange and Yellow wires should have 12 volts and all other wires should have zero volts. With switch in down position Orange and Lt. Green/Black wires should have 12 volts and all other wires should have zero volts.
- With switch in left position, Orange and White/Black wires should have 12 volts and all other wires should have zero volts. With switch in right position, Orange and Lt. Blue wires should have 12 volts, all other wires should have zero volts.
- Operate left side mirror and check voltage at left side mirror switch. With switch in up position, Orange and Yellow wires should have 12 volts and all other wires should have zero volts. With switch in down position, Orange and Lt. Green wires should have 12 volts and all other wires should have zero volts.
- With switch in left position, Orange and White wires should have 12 volts and all other wires should have zero volts. With switch in right position, Orange and Lt. Blue wires should have 12 volts and all other wires should have zero volts.
Corvette
- Remove connector from mirror selector switch. Turn ignition on, operate mirror adjuster control and check voltage at mirror selector switch connector. With control in up position; Yellow, Lt. Green, White and Lt. Blue wires should have battery voltage and Dark Blue wire should have zero volts.
- With control in down position, Dark Blue wire should have battery voltage and all other wires should have zero volts. With control in left position, Dark Green wire should have battery voltage and all other wires should have zero volts.
- With control in right position; Yellow, Lt. Green, White and Lt. Blue wires should have battery voltage. Dark Green wire should have zero volts. If voltages are correct, replace mirror selector switch.
- Check voltage at mirror adjuster control with connector attached. With control in up position, Pink/Black and Black/White wires should have battery voltage and Dark Blue and Black wires should have zero volts.
- With control in down position, Pink/Black and Dark Blue wires should have battery voltage and Black/White and Black wires should have zero volts. With control in left position, Pink/Black and Dark Brown wires should have battery voltage and Black wire should have zero volts.
- With control in right position, Pink/Black and Black/White wires should have battery voltage and Dark Brown and Black wires should have zero volts. If voltages are incorrect, replace mirror adjuster control.
- If voltages are correct, select left or right position at mirror selector switch. Check voltage at connector of selected mirror. With control in up position, Black/White wire should have battery voltage and Yellow wire should have zero volts.
- With control in down position, Yellow wire should have battery voltage and Black/White wire should have zero volts. With control in left position, White wire should have battery voltage and Black/White wire should have zero volts.
- With control in right position, Black/White wire should have battery voltage and White wire should have zero volts. If voltages are incorrect, replace mirror. If voltages are correct, check wiring back to mirror adjuster control and mirror selector switch.
Delta 88 & Toronado
- Check circuit fuse by operating dome lights. Connect a test light to ground and check for 12 volts at Orange wire. If test light glows, connect test light between Orange wire and Black wire. If test light does not glow, check Orange and Black wire circuits.
- If a mirror does not operate, place mirror selector switch in position to operate inoperative mirror. Connect test light between Yellow and Lt. Green terminals of outside mirror switch. Check that test light glows when mirror control switch is in up and down positions.
- Connect test light between Dark Blue (Lt. Blue on Toronado) and White terminals of outside mirror switch. Check that test light glows when mirror control switch is in left and right positions.
- If test light glows but mirror does not turn, check wiring and motor. If test light does not glow when switches are in position to energize its terminals, install a new outside mirror switch.
Fiero & 6000
- Remove outside mirror switch from console, leave switch connected to wiring harness and check for 12 volts at Orange wire. Operate left side mirror and check voltage. With switch in up position, Orange and Yellow wires should have 12 volts and all other wires should have zero volts.
- With switch in down position, Orange and Lt. Green/Black wires should have 12 volts and all other wires should have zero volts. With switch in left position, Orange and White/Black wires should have 12 volts and all other wires should have zero volts. With switch in right position, Orange and Lt. Blue (Lt. Blue/Black on 6000) wires should have 12 volts and all other wires should have zero volts.
- Operate right side mirror and check voltage. With switch in up position, Orange and Yellow wires should have 12 volts and all other wires should have zero volts. With switch in down position, Orange and Lt. Green wires should have 12 volts and all other wires should have zero volts.
- With switch in left position, Orange and White wires should have 12 volts and all other wires should have zero volts. With switch in right position, Orange and Lt. Blue (Lt. Blue/Black on 6000 model) wires should have 12 volts. All other wires should have zero volts.
Ninety Eight
- If neither mirror moves in any direction, check fuse and wiring between fuse block and outside mirror switch. If a problem is found, repair as necessary. If fuse and wiring are okay, check outside mirror switch ground and wiring between ground and connector.
- If a problem is found, repair as necessary. If ground and wiring are okay, check continuity between terminals A and B of outside mirror switch. If there is no continuity, replace switch.
- If one mirror does not move in any direction, check wiring between connector and inoperative mirror. Check continuity of outside mirror switch between terminals A and E, and between terminals F and C for left side mirror. Check continuity of outside mirror switch between terminals A and D, and between terminals G and H for right side mirror.
Riviera
- Remove mirror selector switch from driver's armrest and leave switch connected to wiring harness. Connect a test light to ground and check for 12 volts at Orange wire. If test light glows, connect test light between Orange wire and Black wire. If test light does not glow, check Orange and Black wire circuits.
- Operate right side mirror and check for 12 volts at Orange and Yellow/Black wires. All other wires should have zero volts. Operate left side mirror and check for 12 volts at Orange and Yellow wires. All other wires should have zero volts.
All Others
- Remove mirror selector switch from armrest or instrument panel and leave switch connected to wiring harness. Connect a test light to ground and check for 12 volts at Orange wire. If test light glows, connect test light between Orange wire and Black wire. If test light does not light, check Orange and Black wire circuits.
- Operate right side mirror and check voltage at right side mirror switch. With switch in up position, Orange and Yellow wires should have 12 volts. All other wires should have zero volts. With switch in down position, Orange and Lt. Green (Lt. Green/Black on Skyhawk) wires should have 12 volts. All other wires should have zero volts.
- With switch in left position, Orange and Lt. Blue (Lt. Blue/Black on Skyhawk) wires should have 12 volts. And all other wires should have zero volts. With switch in right position, Orange and White (White/Black on Skyhawk) wires should have 12 volts. All other wires should have zero volts.
- Operate left side mirror and check voltage at left side mirror switch. With switch in up position, Orange and Yellow wires should have 12 volts. All other wires should have zero volts. With switch in down position, Orange and Lt. Green wires should have 12 volts. All other wires should have zero volts.
- With switch in left position, Orange and Lt. Blue wires should have 12 volts. All other wires should have zero volts. With switch in right position, Orange and White wires should have 12 volts. All other wires should have zero volts.
Removal & Installation (Fiero)
Grasp inner and outer edges of glass. Pull glass rearward to disengage it from pivot. To install, align worm gear shafts on glass with drive gears. Press in on glass until it snaps into pivot.
Fiero Power Mirror Assembly. Scheme 1
Removal (All Others)
Cover door to avoid damage to painted surface. Tape mirror, then break mirror glass. Remove broken glass and fiber pad from mirror frame. Wipe inside of mirror frame clean.
Installation
Remove paper backing from service mirror and center mirror in frame. Press mirror firmly to ensure adhesion of mirror to mirror frame.
Removal (Grand Am & Skylark)
Grasp mirror case and pull case away from housing until it snaps free. Remove motor attaching screws, disconnect wiring harness and remove motor from housing.
Connect wiring harness to motor. Place motor in housing and install attaching screws. Pull out stabilizer studs from motor and install on mirror case. Align mirror case with stabilizer stud holes and pivot bar on motor. Install mirror case.
Disconnect negative battery cable and remove mirror. Remove door trim panel, weatherstrip, mirror assembly nuts and mirror assembly. Disconnect wiring harness, remove motor attaching screws and remove motor. To install, reverse removal procedure.
Cover door to avoid damage to painted surface. Remove mirror by tapeing mirror and breaking mirror glass. Remove broken glass, mirror frame attaching screw and mirror frame. Remove motor attaching screws. Lift motor out of housing and disconnect wiring harness.
Connect wiring harness to motor and install motor to housing using screws. Position new mirror frame to motor and install attaching screw. Remove paper backing from service mirror and center mirror in frame. Press mirror firmly to ensure adhesion of mirror to mirror frame.
Typical Power Mirror Assembly. Scheme 2
Removal & Installation (Grand Am & Skylark)
Remove inner belt sealing strip and trim panel. Remove escutcheon assembly screws and escutcheon. Remove mirror assembly screw, wiring harness, nuts, mirror and body filler. To install, reverse removal procedure.
Removal & Installation (All Others)
Remove door trim panel and disconnect wiring harness at connector. Peel back insulator pad and water deflector enough to gain access to wire harness. Detach harness from any retaining tabs in door. Remove attaching nuts from mirror case and remove mirror and harness from door. To install, reverse removal procedure.
Removal & Installation (Armrest Switch)
Remove switch plate mounting screws. Disconnect wiring harness and remove switch. To install, reverse removal procedure.
Removal & Installation (Instrument Panel Switch)
Remove instrument panel trim plate. Disconnect wiring harness and remove switch. To install, reverse removal procedure.
Removal & Installation (Center Console Switch)
Remove center console trim plate. Disconnect wiring harness and remove switch. To install, reverse removal procedure.
WIRING DIAGRAMS
For wiring diagrams, refer to appropriate chassis wiring diagram in WIRING DIAGRAMS section.