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1987-88 Pontiac Bonneville Stereo Wiring
4" x 6" Dash
Left Front (+)
Left Front (-)
Right Front (+)
Right Front (-)
6" x 9" Rear Deck
Left Rear (+)
Left Rear (-)
Right Rear (+)
Right Rear (-)
Disconnect the negative battery cable and ensure it doesn't contact any metal parts. Place the transmission into the "Drive" position and set the parking brake.
Remove the trim from around the stereo by prying at one of the bottom corners with your fingers. Apply pressure until the clips disengage and work your way up the trim. Once the trim is free from the dash set it safely aside.
Locate and remove the six 10mm bolts that hold the stereo in place. Pull the head unit out of the Toyota highlander dash and disconnect the wires from the back of the radio.
Connect the wiring harness adaptor to the original harness. Mount the new stereo into the Toyota radio mounting kit and secure it by following the manufacturer's instructions. Plug the wiring harness adaptor and antenna wire into the back of the new stereo.
Slide the entire stereo assembly into the dash and reconnect the battery cable. Turn the radio on and verify the speakers and controls are working on the new stereo. Secure the stereo in the dash with the six 10mm bolts and replace the trim ring around the radio.
you need a head light switch. buy from carquest (significantly less expensive then dealership). remove knobs (small insert on pull knob press in with a small flathead while pulling towards you, twilight knob pops right off)
take off the cover plate over steering wheel (pop out with flat head screwdriver)
then cover over instruments (small torx bit 5 screws, 2 hidden by previously removed cover).
turn air vents to one side once all the way pull on the part sticking out the most they all come out like that.There will be a screw on the top inside of the vent remove these from each vent.On the bottom were your ac control panel is there is plastic wood grain piece that goes across the dash.Get a flat head screwdriver stick in top of wood grain pry out and work your way down.theres also a small piece on the driver side same senerio.theres a couple screws above the gauges also two in top on inside glove box.