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Sitting in a parked RAV4 Hybrid: accessory mode vs READY, the AC and heat, and what stays on after you shut the RAV4 Hybrid off

This guide is for car campers, parents waiting at pickup, and anyone sitting with a dog in the back. Here's how to sit in a 2019 to 2025 RAV4 Hybrid with the radio, AC or heat on without draining the 12-volt battery, and how the gas RAV4 compares.

For a minute or two, like finishing a song in the driveway, accessory mode is fine in a RAV4 Hybrid. For anything longer, put your foot on the brake, press the power button, and sit with the READY light on. In READY, the RAV4 Hybrid keeps its 12-volt battery charged, and the gas engine only runs now and then.

With the AC on, the RAV4 Hybrid's engine stays off most of the time, because the AC runs off the hybrid battery. With the heat on, the RAV4 Hybrid's engine runs a lot more.

Both the RAV4 Hybrid and the gas RAV4 shut themselves off after about an hour in Park. And never sit in READY in a closed garage, because the RAV4 Hybrid's engine can start by itself without warning.

A lot of people coming from a gas car have the same habit. To sit in a parked car and listen to the radio, you press the button once without the brake and leave the engine off. But on a RAV4 Hybrid, that habit only works for a minute or two.

In this guide, I'll go through the RAV4 Hybrid's power modes and why READY is the better way to sit. And I'll cover how the AC and heat work while you're parked, and how the gas RAV4 compares.

The RAV4 Hybrid's power modes: OFF, ACC, ON and READY

Now the power button on the RAV4 Hybrid does different things depending on whether your foot is on the brake. With the smart key in the car and your foot off the brake, each press moves you through the modes in the table below. With your foot on the brake, one press starts the hybrid system and puts the RAV4 Hybrid in READY.

Power modeHow to get thereWhat worksWhat the gauge screen shows
OFFStop, shift to P, and press the power buttonOnly the emergency flashersThe gauges go dark
ACC (accessory)Press the power button once with your foot off the brakeAccessories like the radio and screen work. The hybrid system is off."ACCESSORY"
ONPress the power button again with your foot off the brakeEverything electrical works. The hybrid system is still off."IGNITION ON"
READYShift to P, press the brake firmly, then press the power button onceEverything works, with the hybrid system on and charging the 12-volt batteryThe green READY light stays on

Basically, to get into READY you only need one short, firm press. You don't need to press and hold the power button. Keep your foot on the brake until the READY light stops flashing and stays on (2023 to 2025 RAV4 Hybrid owner's manual, pp.219 to 220).

And to turn the RAV4 Hybrid off, stop, set the parking brake, shift to P and press the power button. Then check that the gauge screen doesn't say "ACCESSORY" or "IGNITION ON" (p.221).

Something to note is that if you turn the RAV4 Hybrid off while the shifter isn't in P, the RAV4 Hybrid goes to ACC instead of OFF. To fix that, shift to P, check that "ACCESSORY" shows on the gauge screen, and press the power button again (p.223).

Why sitting in ACC drains the RAV4 Hybrid's 12-volt battery

So the RAV4 Hybrid has two batteries. The big hybrid battery drives the RAV4 Hybrid, and a small 12-volt battery runs things like the radio, screen and lights. The RAV4 Hybrid only recharges the 12-volt battery while the hybrid system is on, which is when the READY light shows (p.487).

That means in ACC or ON, the radio, screen and fan all run off the small 12-volt battery, and nothing charges the 12-volt battery. That's why Toyota's manual says not to leave the RAV4 Hybrid in ACC or ON "for long periods of time without the hybrid system on" (p.219).

Now the RAV4 Hybrid does have a backup, called the auto power off function. If the RAV4 Hybrid is left in ACC for more than 20 minutes, it turns itself off. The same goes for ON after more than an hour with the shifter in P (p.223).

But keep in mind Toyota says the auto power off function "cannot entirely prevent the 12-volt battery discharge." So I wouldn't count on that 20 minute timer to save the 12-volt battery.

If the RAV4 Hybrid turned itself off this way, you'll see "Auto Power OFF to Conserve Battery" on the gauge screen. So the next time you start the RAV4 Hybrid, Toyota says to leave the hybrid system on for about 5 minutes to recharge the 12-volt battery (p.468).

And if the 12-volt battery has already gone flat, my RAV4 12-volt battery guide goes through where the battery is and how to jump-start a RAV4 Hybrid.

Why READY is the better way to sit in a RAV4 Hybrid

So in READY, the RAV4 Hybrid keeps recharging its 12-volt battery, and the radio, screen and fan don't drain the 12-volt battery. And the gas engine doesn't run the whole time.

The RAV4 Hybrid's engine shuts off while you're parked and sitting still. The engine starts by itself when the hybrid battery needs charging or the engine needs to warm up, and then shuts off again (pp.70 to 71).

Basically, the RAV4 Hybrid sits quietly most of the time, and then the engine kicks on for a few minutes, which is completely normal. My guide to normal RAV4 Hybrid sounds covers the hums and vibration you'll notice when the engine starts and stops.

Something to note is that you'll want to keep the shifter in P while you sit, not in N, because in N the hybrid battery doesn't charge (p.70).

Sitting in a RAV4 Hybrid with the AC on

So the AC is where the RAV4 Hybrid really pulls ahead of the gas RAV4. On the RAV4 Hybrid, the AC compressor is one of the high-voltage parts, along with the hybrid battery, the electric motors and the orange high-voltage cables (p.75).

Basically, that means the RAV4 Hybrid's AC runs off the hybrid battery, not off a belt on the engine. So in READY with the AC on, the RAV4 Hybrid's engine stays off most of the time and only starts when the hybrid battery needs topping up.

Now how long the engine stays off depends on the weather and your settings.

One owner tested a 2020 RAV4 Hybrid XSE in Florida at about 80ยฐF, with the AC set to 64ยฐF. The AC ran on the hybrid battery for about 15 to 20 minutes. Then the engine ran for about 5 minutes and shut off again (Inspirational Nomad).

So by my own rough math from that one owner's test, the RAV4 Hybrid's engine ran about a fifth to a quarter of the time. That was a short test on a dealer lot, not a full night, so treat the fifth to a quarter as an estimate, not a measured number.

And to get the most cooling, turn off Eco drive mode and Eco air conditioning mode. In Eco drive mode, the RAV4 Hybrid limits the engine speed and the AC compressor, so cooling and heating are weaker. Eco air conditioning mode also turns the fan speed down (pp.343 to 345).

My guide to RAV4 Hybrid drive modes shows where the drive mode switch is and how to get out of Eco.

Also, when it's over 75ยฐF outside with the AC on, the RAV4 Hybrid may switch to recirculated air by itself to use less power (p.344). That's normal, and you can press the air intake button any time to switch back to outside air.

And never sit with the AC on in ACC or ON. Toyota's manual says not to leave the AC on longer than necessary when the hybrid system is off, because the AC drains the 12-volt battery (p.346).

Sitting in a RAV4 Hybrid with the heat on

So the heat works a lot differently in a RAV4 Hybrid than the AC does. The RAV4 Hybrid's cabin heat comes from engine heat, so the engine has to run to make it. Toyota's manual lists "when the heater is switched on" as one of the times the RAV4 Hybrid's engine may not stop by itself (p.71).

On a cold day, the RAV4 Hybrid's engine runs a lot more while you sit, and it may barely shut off at all. That means the idea that a RAV4 Hybrid can sit for almost free mostly holds up in warm weather with the AC on.

The RAV4 Hybrid still beats a gas RAV4 that idles the whole time, but the gap is a lot smaller in the cold.

If you're sleeping in your RAV4 Hybrid on a cold night, my cold weather car camping guide covers safer ways to stay warm. It also covers whether to leave the RAV4 Hybrid running all night.

Gas RAV4 vs RAV4 Hybrid when you're parked

Now both RAV4s share a lot of the same rules when you're parked. The big difference is what each RAV4's engine does while you sit with the AC on.

Sitting parkedGas RAV4RAV4 Hybrid
With the AC onThe gas RAV4's engine idles the whole time to run the ACThe RAV4 Hybrid's engine stays off most of the time and starts now and then to charge the hybrid battery
With the heat onThe gas RAV4's engine idles the whole timeThe RAV4 Hybrid's engine runs a lot more, and may not stop at all
Fuel usedA quarter to a half gallon an hour for a gas car idling, depending on engine size and AC useNo published number for a RAV4 Hybrid parked in READY
Shuts itself off afterAbout 1 hour in Park with the engine runningAbout 1 hour in Park in READY
Left in ACCTurns off after 20 minutesTurns off after 20 minutes
Garage and snow warning in the manualYesYes

Now keep in mind the gas RAV4's fuel number is for gas cars in general, not a RAV4 test. fueleconomy.gov says a gas car idling burns "a quarter to a half gallon of fuel per hour, depending on engine size and air conditioner (AC) use."

And nobody has published a measured fuel-per-hour number for a RAV4 Hybrid sitting in READY with the AC or heat on, so I won't guess one. But the RAV4 Hybrid's engine is off most of the time with the AC on. So in warm weather, the RAV4 Hybrid uses a lot less gas sitting parked than the gas RAV4.

The gas RAV4's shutoff times are the same as the RAV4 Hybrid's (2023 to 2025 gas RAV4 owner's manual, pp.206 to 208). So ultimately, for sitting parked with the AC on, the RAV4 Hybrid is the better pick, because its engine stays off most of the time. With the heat on, the gap gets a lot smaller.

The RAV4 Hybrid's one-hour shutoff, and how to keep the RAV4 Hybrid running

So if the RAV4 Hybrid sits in Park with the hybrid system on, the RAV4 Hybrid shuts itself off after about 1 hour (p.221). That turns off the AC or heat too, which can catch you by surprise if you're waiting in a pickup line or sleeping in the back.

Basically, the timer starts over any time you press the brake or shift out of P. So if you're sitting in the driver's seat, a tap on the brake resets the hour.

And there's one more way to keep the RAV4 Hybrid from shutting off after an hour. If you lock the doors with the door lock switch on the inside of the door, the one-hour shutoff turns off. The same goes for locking from outside with the metal key that slides out of the key fob.

The one-hour shutoff comes back on the next time the driver's door is opened (pp.221 to 222).

Keep in mind Toyota's manual also says not to leave the RAV4 Hybrid with the hybrid system running for a long time. If you have to, park in an open space and make sure exhaust can't get inside (p.222).

Sitting in a RAV4 Hybrid safely: garages, snow, kids and dogs

Never sit in READY in a closed garage. The RAV4 Hybrid is silent in READY, so it's easy to forget the RAV4 Hybrid is on. But the engine can start by itself at any time to charge the hybrid battery, and exhaust has carbon monoxide, which you can't see or smell.

So if the RAV4 Hybrid is in a closed or poorly ventilated area, like a garage, Toyota says to stop the hybrid system (pp.48 and 222). The gas RAV4's manual has the same warning for the gas engine (p.207).

Now a Car Talk column from 2022 told a reader that leaving a RAV4 Hybrid on in an attached garage for 15 minutes probably wasn't dangerous. But Toyota's manual says to stop the hybrid system in a garage, so I'd go with the manual every time.

And snow is the other danger when you're sitting in a RAV4 Hybrid with the hybrid system on. Toyota says not to leave the hybrid system running where it's snowing or where snow is piling up. If snow builds up around the RAV4 Hybrid, exhaust can collect and get inside (pp.48 and 222).

My cold weather car camping guide covers keeping the tailpipe clear on a snowy night.

And if you're waiting with kids and need to step out, Toyota's manual says never to leave children alone in the vehicle (p.10). And if you leave a dog in the RAV4 Hybrid with the AC on, keep in mind the AC stops when the one-hour shutoff kicks in. My RAV4 dog setup guide covers gear for riding with a dog.

The screen and lights that stay on after you turn the RAV4 Hybrid off

Right after you shut off a RAV4 Hybrid, some lights can stay on for a bit. That's normal, and the lights shut off by themselves.

And if the center screen is still lit, go by the gauges instead. If the gauges are dark and the gauge screen doesn't say "ACCESSORY" or "IGNITION ON," the RAV4 Hybrid is off (p.223).

A few more tips for sitting in a RAV4 Hybrid

RB

Buddy's take

So ultimately, if you're sitting in a RAV4 Hybrid for more than a couple of minutes, I'd put it in READY, not accessory mode. READY keeps the 12-volt battery charged, and with the AC on, the RAV4 Hybrid's engine stays off most of the time. In the cold, the heat keeps the engine running a lot more, but READY is still the right way to sit.

And just tap the brake now and then so the one-hour shutoff doesn't catch you. But never sit in READY in a garage or with snow piling up around the RAV4 Hybrid.

So hopefully this helps the next time you're waiting in the car. And if you have a question, feel free to email me at contact@ravbuddy.com. I read as many messages as I can, and your questions help me make these guides better.

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