Wiring Location For Trailer Brake Controller On a 2021 Buick Enclave With Factory Trailer Package

Updated 12/16/2024 | Published 11/30/2021

Products Featured in This Question

Redarc Tow-Pro Elite Brake Controller - Dash Knob - Off-Road Mode - Up to 3 Axles - Proportional

(1697)

$290.00

Deka Heat Shrink Butt Connector - 16-14 Gauge - Nylon Insulation - Blue - Qty 5

(1141)

$9.09

Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 5

(1141)

$7.51

Question:

do you have a wire harness to connect a Drawtite Electric Brake Controller to a 2021 Buick Enclave WITH factory trailer package. thanks

asked by: Mark N

Expert Reply:

Your 2021 Buick Enclave has a wiring pigtail and not a connector for wiring a Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR. The 4 wires are located below the OBD2 port behind the side kick plate(see Image). This is where you will be able to attach the included pigtail using the Heat Shrink Butt Connectors # DW05744-5 and # DW05745-5. You will only need 2 of each connectors for the 4 wires that connect to the brake controller pigtail.

expert reply by: Bud M

Wiring For Trailer Brake Controller On 2021 Buick Enclave
(click to enlarge)

Donna O.

3/27/2024

I can’t find the trailer wiring shown in your picture in my 2021 Buick Enclave. You have a still picture of it and we need to know if you had to unwrap that wire harness from other wire harnesses. It is so hard to find.

Bud M.

3/28/2024

@DonnaO The wiring is just wrapped up on itself. Do understand this can easily be different on different vehicles even of the same year depending on how it was installed from the factory. The best recommendation I can make is following the main harness and feeling for any places where you can feel some additional wires which may have gotten rolled up on the larger harness as well. It could have also gotten tucked down below the flooring since it is such a short strand of wiring that is not secured off in any way.

Donna

4/1/2024

@BudM I did find the wires but no power going to the 12 volt red wire. Says in my manual have technician connect 12 volt wire to battery block??? We can’t find anything under the hood to connect.

Donna

4/2/2024

@BudM It was a blown fuse in rear of car for trailer brake.

See All (4) Replies to Donna O. ∨

John H.

12/16/2024

The 2021 Enclave, without OEM trailer package, did not provide the brake apply signal on the white/blue wire. I'm trying to get the dealer to see if this can be reprogrammed.