Toyota Tundra Owners Manual: Trailer brake controller

Summary of functions

The trailer brakes can be controlled by the Trailer brake controller via the 7-pin connector. By selecting the type of brakes that are being used on the trailer (electric or electric-over-hydraulic) and setting the gain for the controller, the manual TRAILER BRAKE OUTPUT slider is used to slow just the trailer. The vehicle brake pedal will also slow down as well as stop the trailer when applied, also via the same connector.

Gain values, manual brake outputs, trailer brake types, and the trailer connection status are displayed in the multi-information display.

Using the driving support systems

  1. Trailer connection indicator
    When the trailer has been connected, the indicator comes on green.
  2. GAIN (+/-) selection button
    Pressing the GAIN (+/-) buttons will adjust the amount of power that can be outputted to the trailer brakes. The gain can be adjusted from 0 (no trailer braking) to 10 (maximum output) in 0.5 increments. Each press of the button will increase or decrease the gain setting by one step. The gain value will appear in the multi-information display.
  3. Trailer brake type
    Trailer brake type can be selected by using the multi-information. The combination meter will show which trailer brake type is selected in the multi-information display.
  4. Manual TRAILER BRAKE OUTPUT slider
    Adjusting this slider position will engage the trailer's brakes only. If the manual TRAILER BRAKE OUTPUT slider is used while the vehicle brake is applied, the greater of the two outputs will be sent to the trailer brakes.

Changing settings of the trailer brake type

The trailer brake type can be selected on the multi-information display as following:

1. Press "" or "" of meter control switches and select .

2. Press "" or "" of meter control switches and select "Vehicle Settings", and press .

3. Press "" or "" of meter control switches and select "TBC Trailer Type", and press to select the correct type of trailer brakes that are equipped on the trailer.

Changing trailer brake type will cause the current gain setting to reset to zero. Make sure to set the gain as described in the following section.

Setting the Gain

Gain setting on trailer brake controller should be set for a specific towing condition. Gain setting should be adjusted each time the vehicle load, trailer load, road conditions, or weather changes. Setting the gain value to 0 will disable the trailer brake controller output.

1. Make sure the trailer brakes are in good working condition and functioning normally. See trailer dealer if necessary.

2. Hook up the trailer and make proper electrical connections.

3. Select the correct type of trailer brakes that are equipped on the trailer by using the multi-information display.

4. Drive vehicle with trailer attached on a level road surface similar to towing condition and in traffic-free environment. Driving speed should be approximately 20 - 25 mph [35 - 40 km/h].

5. Using the GAIN (+/-) selection buttons, set a starting gain of 5.0.

Using the driving support systems

6. While driving 20 - 25 mph [35 - 40 km/h], fully apply the manual TRAILER BRAKE OUTPUT slider.

7. Adjust the gain setting, using the GAIN (+/-) selection buttons, to either increase or decrease to just below the point of trailer wheel lock-up.

8. For confirmation, repeat steps 6 and 7 until desired gain setting is reached (just below point of trailer wheel lock-up).

■When using the trailer brake control system Please turn off the intuitive parking assist while towing a trailer. If left on, sonar sensors will detect the trailer being towed.

■When setting the gain Wheel lock-up occurs when the trailer wheel squeals or tire smoke occurs.

Trailer wheels may not lock-up while driving heavily loaded trailer. During this case, adjust the Trailer gain to the highest allowable setting for the towing condition.

■When disconnecting and reconnecting battery terminals The gain setting data will be reset.


■Trailer brake type setting It is the responsibility of the driver to make sure the trailer brakes are functioning normally and adjusted appropriately. Failure to check and maintain trailer brakes may result in loss of vehicle control, crash, or serious injury.

Trailer brake control system will work with most electric and electric-over-hydraulic trailer braking systems up to 3 axles (24A output to trailer brakes).

Please be sure to test compatibility with the system at low speeds and in a safe area. If a warning message appears in the multi-information display, have the vehicle inspected by your Toyota dealer immediately.

Some electric-over-hydraulic trailer brakes will take some minimum output to activate. Trailer brake control system will not work with trailer hydraulic surge brakes.

When driving on slippery road surfaces When stopping with ABS activated, output to the trailer might be reduced in order to reduce the likelihood of trailer wheels to lock. The trailer is not equipped with ABS. Drive safely on slippery road surfaces.

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