DAC on a Toyota Highlander stands for Downhill Assist Control. This system helps the vehicle descend a steep hill at a constant low speed without the driver needing to operate the brake pedal.
What is DAC on a Toyota Highlander?
DAC is the acronym for Downhill Assist Control, a vehicle feature documented in Toyota's owner manuals as a downhill-driving aid. It is not a phone or app setting; rather, it is a stability and convenience feature available only on Highlander models if equipped. The system is designed to maintain controlled speed on steep or slippery descents, giving the driver more confidence in off-road or low-traction conditions.
How Downhill Assist Control works
When activated, Downhill Assist Control automatically applies the brakes to individual wheels to maintain a slow, steady speed down a steep slope. This happens without any brake pedal input from the driver. The system works in conjunction with the vehicle's traction control to reduce the risk of skidding or loss of control, making it especially useful when towing heavy loads or driving on slippery surfaces.
How to activate and use DAC
To activate the system, press the DAC button located on the vehicle's control panel. The slip indicator will flash to confirm that DAC is operating. In some older Highlander models, the system engages only when the shifter is in S1 or R mode. To turn the system off, press the DAC button again.
DAC speed limits and model year differences
The exact speed at which DAC maintains descent varies by model year. In the 2023 Highlander owner's manual, Toyota states the system helps the vehicle descend at about 18 mph (30 km/h). An older Highlander quick-reference guide shows a lower speed of about 3 mph (5 km/h). Additionally, one owner's manual section documents that DAC does not operate, or stops operating, if vehicle speed is higher than 15 mph (25 km/h). Because these figures differ, you should check your specific owner's manual for the exact behavior of your Highlander's model year.
Frequently Asked Questions
Is DAC the same as a phone setting?
No. Toyota documents DAC as a vehicle feature controlled by the DAC button or switch, not by phone menus or a mobile app. There are no iPhone, Android, or carrier steps for Highlander DAC.
Does DAC work on all Highlanders?
No. Toyota says DAC is "if equipped" and depends on the model year and specific equipment package. Not every Highlander has this feature.
What tells the driver DAC is active?
The slip indicator flashes when DAC is operating. This is the primary visual confirmation that the system is engaged and working.
Can DAC be turned off?
Yes. Pressing the DAC switch or button again turns the system off, as documented in Toyota's owner manuals.
Is DAC the same as hill descent control on other vehicles?
Yes. DAC and hill descent control (HDC) are essentially the same technology, though different manufacturers may use different names. Both systems assist the driver when navigating steep downhill terrain.
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