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I fixed one of these recently in a 2003 Outback. The brake light pedal switch feeds the circuit that releases the shift lever lock when it's in Park. (This is why you need to press the brake pedal to shift out of Park.) If the fuse to this circuit is blown, the shift level lock will not release. I traced the issue to the trailer light conversion box (factory/dealer installed, I think). This car has a clear plastic plug that the trailer light conversion box plugs into and the clear plastic plug appears to be a factory-installed part of the wiring harness, accessed on the passenger side of the car, just above the spare tire compartment behind the rear quarter interior panel (you don't need to remove the interior panel to access, just all of the spare tire compartment foam pieces). I've seen these conversion boxes fail before or the wires become shorted somewhere between this internal connection and the trailer pig tail connection end. I unplugged the box from the car's wiring harness at the clear plastic plug mentioned above and the fuse stopped blowing, the brake lights starting working again as well as the turn signal lights and the shift lever unlocked by pressing the brake pedal. This car doesn't tow so it wasn't a problem but you might need to investigate further or replace the conversion box if you need the tow lights connection to operate still.
you will find the connector underneath by the spare tire on the frame, you can by the rest of the harness at dealer to plug right into it.Hope this helps
Look in your glove box and see if you have the PRO code U89: wiring harness, car trailer
It's common to have the trailer harness already installed in your Silverado without you know and the dealer can pull it out for you from where it's tucked up in the frame passenger side by the spare tire for the simple cost or $65.00.
http://www.etrailer.com/tv-wiring-install-2006-chevy-silverado.aspx
Thank you for using fixya and good luck.
Third brake light is on a differnt wrie then the turn signals on the truck. This is so it doesn't blink like your turn/brake lights do. Your fuse panel in the truck houses the fuses for the brake and turns on the truck .The fuse panel in the engine compartment houses the fuses for the trailer brake and turn. Check your fuses in the panel below your steering column for blown fuses and also check your rear bulbs as i have seen both burnt out at the same time. otherwise check your wiring harness right behind the last crossmember on the left side up by the spare tire. Sometimes they get corroded there at the connections.
You buy a plug-in trailer wiring harness for this vehicle. I bought mine at NAPA. The vehicle harness plug is in the wiring stuffed behind that LR access panel wherin the car jack sits. You may have to actually remove the LR tail light assembly to discover the plug, but it's there. The wiring harness is a bit pricey, more than the usual DIY harness, but it makes for a very clean, flawless, and effortless connection.
It may be behind a access panel all the way towards the back of the inside of car. you must access the wiring harness for rear tail lights this is usually behind the left side rear access panel in the car.
The connectors for towing wire harnesses on foresters are generally on the passenger side, below the rear taillight inside the cargo space. some require pulling up the foam block that is between the spare tire compartment and the taillight. Check where you replace the tailights from inside the car, if there isn't a matching connector hanging out there, check around the spare tire compartment, see if you can remove the carpeted foam block next to the compartment and find the plug under there.
Hi: under the hood in the power distribution box there is a 40 Amp fuse that has to be installed to power up the trailer package. When standing looking from the front left fender it should be at the front right corner, refer to the power distribution diagram on the cover. As well under the box by the spare tire is a plug in type module mounted on the frame. There should be 2 wire harnesses located there, make sure the correct plug in is connected. Hope this helps... please rate suggestion .... ty
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