2010 Volvo XC90 Tow Wiring and Brake Controller Install  

Question:

Helpful Expert Reply:

To install the Tekonsha Prodigy RF Brake Controller # TK94FR brake controller on your 2010 Volvo XC90 and trailer you have established an excellent plan. You are correct in choosing the Tekonsha Prodigy RF Brake Controller for your vehicle that is equipped with multiplex wiring. You will also need a functioning 4-pole trailer connector.

You can install either the Curt T-Connector # 56045 or the Tow-Ready # 118411 to establish a 4-pole wiring connector. To install either of these connectors you will have to access the area behind your rear taillight assemblies and plug the connectors inline to the factory wiring. Then you will have to run a power wire from the converter box to the positive battery terminal.

Once the 4-pole is installed you will then need to use the 4-pole to 7-way adapter, part # C57674. The 4-pole portion of the adapter will plug directly into the 4-pole connector you just installed. Once that is completed, the adapter has four additional wires. The blue wire typically carries the Brake output voltage, but because you are using the RF controller, this circuit will not be needed. Simply tape the end of the wire off and coil it up out of the way. The white wire is grounded to the vehicle frame. The yellow wire is intended for a reverse light circuit, but will not be needed. Tape off the end and coil up out of the way like the blue wire. The black wire provides 12-volt power to the trailer connector to feed the RF unit. Use a butt connector to attach enough 10 gauge wire # 10-1-1 to reach he positive battery terminal. A 40 AMP circuit breaker, part # Pk54540 needs to be installed inline on this circuit.

Now that the 7-way is installed on your Volvo you can proceed to mount and install the Tekonsha wireless brake controller # TK94FR. The optimal position to mount this controller is on the a-frame or tongue portion of your trailer. I have included a photo of the preferred mounting locations for your reference.

You can then proceed to pair the remote brake controller unit to the hand held remote. When doing this please be sure to follow the instructions exactly because the syncing process is very specific for this remote brake controller.

If you are towing this trailer with a vehicle that already has a brake controller installed, then you can bypass the Tekonsha brake controller all together. This is done by plugging the trailer directly into the tow vehicle which bypasses the remote brake controller entirely.

I have included links to the parts listed above, as well as some videos for your reference.

expert reply by: Rachael H

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