The Pontiac Bonneville was around for decades and much changed in the overall construction of the vehicle as time passed. Therefore any repair job will require an owner’s manual or repair manual for specific instructions. However, with a repair as simple as the troubleshooting and removal of a headlight switch there are some simple steps general to all Bonneville years and generations. If you notice the headlights are no longer working correctly and you have already checked the bulbs, then it is time to investigate the switch itself.
Tools Used: Tools, Screwdriver set, Wire clips, Replacement switch
Troubleshooting Headlight Switches
Disconnect the negative terminal of the Bonneville’s battery and let the power drain from the system for 30 minutes before working on the switch.