[KC0KEK]

Is there really no way to keep the vehicle in retained accessory power mode for more than 10 minutes? I was at a drive-in theater last night, and I kept having to hit the start-stop button every 10 minutes to keep the radio on. Very annoying, especially when it was a double feature.

The manual says RAP mode is limited to 10 minutes. Cadillac customer service says: "The main reason this shuts off after this time is to conserve the power of the battery. The only way you can have the radio still running while in park is if the engine is still on."

Is this the case with all vehicles that have a start-stop button? Or just Cadillacs?

 

[Cutlass]

If you just push the Start button once without your foot on the brake, doesn't that put it in "Accessory" mode.Or you could press and hold the start button for something like 5-10 seconds. That puts you in ignition on mode, similar to turning an ignition key to "on" with the engine off.
But I would definitely be worried about killing the battery after a while.

 

[KC0KEK]

If you just push the Start button once without your foot on the brake, doesn't that put it in "Accessory" mode.Or you could press and hold the start button for something like 5-10 seconds. That puts you in ignition on mode, similar to turning an ignition key to "on" with the engine off.
But I would definitely be worried about killing the battery after a while.

Yup. That's what I had to do every 10 minutes over the course of a 2:15 movie and then a 1:30 movie. Fortunately the battery still had plenty of juice when I turned the engine on to leave.

The instruments also are illuminated in RAP mode. I turned down the brightness as far as I could.

 

[Cutlass]

The press and hold for 10 seconds should stay on indefinitely.

 

[KC0KEK]

The press and hold for 10 seconds should stay on indefinitely.

Unfortunately it doesn't. Here's what Cadillac said: "After looking into your owner's manual, while it does mention the vehicle having a Retained Accessory Power feature, it also states that the Infotainment system can only be used up to 10 minutes after the engine is turned off. The main reason this shuts off after this time is to conserve the power of the battery. The only way you can have the radio still running while in park is if the engine is still on. For more information on this, you can go to page 195 of your owner's manual where it will describe more about this feature."

I think Cadillac and other OEMs are getting hypersensitive about battery drain. I do work for some of their Tier 1 and Tier 2 suppliers, and their marketing messaging to the OEMs increasingly plays up how their tech won't cause a battery to go dead when a vehicle sits in airport parking for a week.

An example is next-gen key fob systems that can determine the driver's direction when approaching a vehicle so they know whether to pop the trunk or hatch. This eliminates the need for a sensor under the bumper to detect a foot, but constantly listening for a fob can drain the battery . . . or so the story goes. I don't see how it's more of battery suck than the foot sensor.

 

[Cutlass]

I guess what I’m referring to is called “service mode.”
Click onto this website, scroll down to the “system diagnostics” header and read the first few paragraphs. It says it’ll stay on for 3 hours in “Service Mode” or 10 minutes in “Accessory Mode”

Push Button Start Technology

I’m sure you’ve heard the phrase, “Don’t get pushy.” Well, in the automotive world this phrase seems to have taken on a new meaning. In the last 10 to 15 years or so the number of buttons on a motor vehicle seems to have grown immensely. I remember back in the early days of my automotive career...

m.autoserviceprofessional.com

 

[KC0KEK]

Thanks for the tip. I wasn't aware of that mode. Sounds as if it would do the trick at a drive-in.