Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test C: One Mirror Inoperative In Left/Right Position
1999 Buick Regal LSSECTION Test C: One Mirror Inoperative In Left/Right Position
- If left mirror is inoperative, go to next step. If right mirror is inoperative, go to step 4 .
- Disconnect left power mirror connector. Connect test light between left mirror connector terminal "A" (White wire) and battery voltage. See Figure . Select left mirror. Move power mirror switch to left position. If test light illuminates, go to step 5 . If test light does not illuminate, go to next step.
- Check for poor connection or open in White wire between power mirror switch connector terminal "J" and left power mirror connector terminal "A". See WIRING DIAGRAMS . Repair as necessary. If circuit is okay, replace power mirror switch. See POWER MIRROR SWITCH under REMOVAL & INSTALLATION. Recheck system operation.
- Disconnect right power mirror connector. Connect test light between right mirror connector terminal "A" (Red/White wire) and battery voltage. See Figure . Select right mirror. Move power mirror switch to left position. If test light illuminates, go to next step. If test light does not illuminate, go to step 6 .
- Replace power mirror motor pack. See POWER MIRROR DRIVE MOTOR under REMOVAL & INSTALLATION. Recheck system operation.
- Check for poor connection or open in Red/White wire between power mirror switch connector terminal "F" and right power mirror connector terminal "A". See WIRING DIAGRAMS . Repair as necessary. If circuit is okay, replace power mirror switch. See POWER MIRROR SWITCH under REMOVAL & INSTALLATION. Recheck system operation.
RENDER: 1.0x
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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.