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How To Put Your Corvette Into "True" Accessory Mode

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How To Put Your Corvette Into "True" Accessory Mode

Old 01-11-2019, 06:48 PM
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Default How To Put Your Corvette Into "True" Accessory Mode

So I realized that there are a number of people that are not sure of how to put their vehicles with Push-Button Start / Keyless Ignition into Accessory/On mode (without the vehicle actually running. Getting into the vehicle and pressing the start button one quick time without your foot on the brake and/or clutch will put your vehicle into Accessory Mode. However, as I mention in the video, if you're attempting to leave the house early in the morning / late at night and you parked the car with the exhaust set to Sport or Track, you fear waking the entire household. I show you how to keep that from happening in the video.


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Old 01-11-2019, 07:42 PM
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That's not Accessory Mode, that is actually the same as being full ON but without actually cranking the engine (or the engine running)

Last edited by KenHorse; 01-11-2019 at 07:44 PM.
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Old 01-11-2019, 07:51 PM
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Originally Posted by [email protected] View Post
Can someone remind me how to embed videos?
Put the YT ID inside [yt] tags


Last edited by KenHorse; 01-11-2019 at 07:52 PM.
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Old 01-11-2019, 08:01 PM
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Originally Posted by KenHorse View Post
That's not Accessory Mode, that is actually the same as being full ON but without actually cranking the engine (or the engine running)
So how do you put in accessory mode only?
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Old 01-11-2019, 08:13 PM
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Originally Posted by V Vette View Post
So how do you put in accessory mode only?
M7 - Press and release START button without depressing clutch.

Auto - Press and release START button without depressing brake (I believe this to be true but I've never owned an auto C7)

This places the car into RAP mode (Retained Accessory Power). However not all features are accessible in this mode, hence the OP's post. But what he demonstrates is NOT "Accessory Mode"

Last edited by KenHorse; 01-11-2019 at 08:15 PM.
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Old 01-11-2019, 08:26 PM
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Accessory mode is the quick push and release of the button without stepping on the brake or clutch that does not enable all the features that are on when running. Back in the old days it was used (usually by turning the key backwards or one click forward) to turn things on without energizing the ignition circuit, which could burn ignition points under the right conditions.

The only real difference between accessory mode now and then is that it times out after a short period rather than staying on as it used to. Holding the start button without the brake until it goes full on is good for using the FM radio at the drive in movie since there is no concern for those pesky points anymore.

Another cool trick is holding the start button with both the brake pedal pressed and the throttle pedal pressed to the floor. That will crank the engine without starting until the throttle is released which is (opinion here!) a good idea if the car has not been started for a long time. That's how it works with the A6 tranny anyhow, not sure about the M7.
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Old 01-11-2019, 11:20 PM
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Originally Posted by KenHorse View Post
M7 - Press and release START button without depressing clutch.
Yeah, that works - but it times out. There's no true accessory mode on the C7. Not that I'm aware of anyway......
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Old 01-11-2019, 11:38 PM
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As Ken says, this is not "true accessory mode," No such thing. this is called SERVICE or SERVICE ONLY MODE. If you want to read more, it's explained in the OM.

This is the same as old keyed ignitions in the ON position (as opposed to ACC position for the key), where most if not all things are the same as when the engine is running. You can even run codes in it.

Beware, this does not time out like ACCESSORY MODE will. You will need to exit this mode, or you will come back to a dead battery.

Last edited by owc6; 01-12-2019 at 12:22 AM.
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Old 01-12-2019, 01:40 AM
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Originally Posted by TyBoo View Post
Accessory mode is the quick push and release of the button without stepping on the brake or clutch that does not enable all the features that are on when running. Back in the old days it was used (usually by turning the key backwards or one click forward) to turn things on without energizing the ignition circuit, which could burn ignition points under the right conditions.

The only real difference between accessory mode now and then is that it times out after a short period rather than staying on as it used to. Holding the start button without the brake until it goes full on is good for using the FM radio at the drive in movie since there is no concern for those pesky points anymore.

Another cool trick is holding the start button with both the brake pedal pressed and the throttle pedal pressed to the floor. That will crank the engine without starting until the throttle is released which is (opinion here!) a good idea if the car has not been started for a long time. That's how it works with the A6 tranny anyhow, not sure about the M7.
Holding down the accel pedal to the floor puts it in "clear flood mode". It shuts off the injectors, that why it doesn't start.
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Old 01-12-2019, 02:34 AM
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Interesting video, Josh. Thanks.
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Old 01-12-2019, 08:55 AM
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If you have a manual trans and put the car in "Service" mode" you can bump start the car if it's on a hill. Just like the old first notch of the key.
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Old 01-12-2019, 10:37 AM
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Josh, Thank You!
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