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Re: wiring car to be towed behind rv
You can buy a inexpensive light tester, hook it to ground, have some one step on the brake, and if the tester come on that means you foun the rt circuit, make sute to have the helper, step on it 2 or three times to make sure thats the rt cable
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Try checking your fuses first, if all good then check power from the fuse panel to all the accessories you say are not working. Might want to also check the area under the carpet along driver side. Sometimes, the main harness gets wet and corrodes terminals that supply power to seat. May want to also check the wiring harness that runs to the door which is inside the rubber molding by the driver door hinges. Wires often break in this area.
If you have to have the key on to unlock the steering wheel, try installing a battery cut off switch under the hood. You cannot completely remove battery power completely or you will loose the radio station memory and the brake lights. You can install a battery isolator on the RV so you can charge the battery on the odessy while you're towing it using a wire on the hitch connector.
There are two junction connections on the four wire harness that runs from the SDM (airbag controller under driver seat) to the passenger side airbag (I/P module). Once connection is just below the passenger side airbag in the dash and another is behind the driver side kick panel.
In my case, the connector behind the driver side kick panel had likely a bit of corrosion and there was high resistance that thre the service airbag message and light on the dash. Once I cleaned this connection, the light was gone and the problem is now fixed.
High resistance in either of these connections will throw the B0019 OD code.
check the wire loom from the boot to under the back seats, I have herd over time the back seat can cut the wiring loom as the metal in the back seat can cut the wires. saw this on a classic cars site a few years ago. you will need to fix the wires back and reseal the wires with sealing tape. also make sure the wiring is back out of the way for the seat.
shorted wiring , usually found under carpet area towards rear passenger area. removal of rear seat required (battery under seat) I have found breaks usually around driver seat mounting ( driver seat removal may also be required to find break/short)
One of the most common issues with this concern on this year and model vehicle here is water corrosion in the wiring connectors under the vehicle on the drivers side.
If you look under the drivers side of the vehicle just below the rear of the drivers seat area you should see wiring connectors that plug into the floor under the vehicle.
If when you disconnect these there is corrosion build up or water then the connectors and or terminals need replaced to correct this concern.This will involve pulling the carpet up in the rear seat area behind the drivers seat to access the opposite end of these connectors.you can clean the connectors with pure white vinegar .let the wire plug sit in it for a wile. then wash off and clean with an old tooth brush. then using some sealant smear it round the rubber seal with your finger. put the wires back in and on the ends were the wires are on the plug put some sealant on them to. this should help it not take on water again for a long wile. this can be a good fix if the connections are still good. if not replace then do this when it is back on the vehicle.
I would say that the tail lamp isn't plugged in but- if it is follow the wiring from the tail lamp forward there must be a break in the wiring -maybe someone cut the wires to patch in towing lights - cheers Denny
The 8 wire plug on newer models is for trailer hauling. The wires give power to the following; break lights, marker lights, backup lights (as equipped) parking lights, electric breaks (larger trailers will have these) one wire is a ground, and, through a positive wire, will trickle charge your trailers house batteries also. There is an industry standard to wiring one of these plugs, so you should be able to purchase any "newer" style trailer (tent, tow behind or 5th wheel, or camper) and the wiring harness will be wired accordingly. Any RV shop or auto shop should be able to provide a schematic for the wiring if you require one.