Parts Needed To Add 7-way Connector and Trailer Brake Controller On 2021 Toyota Sienna  

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Expert Reply:

To add a 7-way connector to your 2021 Toyota Sienna you will first need to add a 4-way connector of which I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # TK69FR as it is a plug and play installation with not splicing.

With the 4-way connector installed there are two options for a 7-way connector. The # ETBC7 with a traditional controller like the Tekonsha Prodigy P3 # 90195, or the option I recommend is the # ETBC7L with the Curt Echo Wireless # C51180.

The reason for this is the # C51180 plugs into the 7-way connector meaning you will not need to run wiring into the passenger compartment of your vehicle, and will not have to drill any holes in the dash to mount a controller.

To install the # ETBC7L you will plug it into your new 4-way connector and make the following connections:

White wire grounded to frame of vehicle
Black wire to positive terminal of battery with included 40 amp circuit breaker.

I also recommend the no drill mounting bracket # 18140 to secure the 7-way connector to your trailer hitch receiver.

I included videos of the products mentioned for you to take a look at.

expert reply by: Samuel C

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