Batboard

I have a just installed a new CDM1250 in my 2003 F-350 Superduty 7.3 Diesel. I would like to use the ignition sense cable to power the radio on and off when cranking and turning off the engine. I have programmed it in CPS to "On & OFF & Ignition. The only problem I have is that the longest you can delay the radio is for 6400 milliseconds before it turns on. With it getting colder now, it sometimes takes 5-8 seconds for the "wait to start" light to go off, which exceeds the 6400 milliseconds. I also have a remote starter and it has a 15 second delay. So.. whatever I do I need to have the radio at least stay inactive for longer than 15 seconds. I have checked the fuse box and can't find a fuse that is only hot while running or I would run the ignition sense wire to that. Any suggestions?

Usually the am/fm radio has an ign/accy fuse that also turns off during crank.

If I did use that method I would be your recommendation for the "Accessory Power Up Delay"? Also what is the "Duration Debounce" in Motorola CPS for the CDM1250? Thanks for you help!

I guess I don't understand the question. I should look at the cps to see what you are talking about.

The accy power up delay is how long the radio ignores an active input on the accy plug after power up, not how long the radio delays powering up. This prevents the radio from acting on an input when either it ,or the accessory, might be in an invalid state.

You seem to be attempting to delay the radio from turning on. Why would you need to delay powering up a radio after the ignition sense line goes high?

To prevent the radio from being on while I crank the vehicle. It is diesel, so in cold weather...I'm looking at 3-8 seconds before it starts. If i am using my remote starter it delays 15 seconds. However. I believe I have found the solution for the issue.... using the AM/FM 5 amp startup fuse, it disables the radio just as the vehicle begins to crank and then the radio turns back on after cranking. Thanks for the help!

Good choice. It will force the radio off and prevent it from going to a weird place during engine crank - the same reason Ford did it. Glad to help.

Thanks for the help..However, I have a new problem. Everything works fine until I put my truck into park. The radio then turns off. If I put it back into drive the radio comes back on. Kinda weird....

Engineer209 wrote:Thanks for the help..However, I have a new problem. Everything works fine until I put my truck into park. The radio then turns off. If I put it back into drive the radio comes back on. Kinda weird....

Sounds like your power feed is not in the right place. Try to find another ignition soucre point.

Jim

Voltmeter time.

Duration debounce - a software option that essentially (heavily paraphrasing here) to let the input line stabilize before it commits to interpreting the logic signal. If you had a GPIO input that was looking for 12vdc to trigger something, and the 12vdc signal applied flutters heavily when it starts and doesn't go perfectly to voltage high status - the GPIO would geek out and try to interpret all the modulations and "bounce around" until it normalizes. From what I understand, this forces the radio to delay the GPIO interpretation for a little, to allow stabilization & less falsing.

thebigphish wrote:Duration debounce - a software option that essentially (heavily paraphrasing here) to let the input line stabilize before it commits to interpreting the logic signal. If you had a GPIO input that was looking for 12vdc to trigger something, and the 12vdc signal applied flutters heavily when it starts and doesn't go perfectly to voltage high status - the GPIO would geek out and try to interpret all the modulations and "bounce around" until it normalizes. From what I understand, this forces the radio to delay the GPIO interpretation for a little, to allow stabilization & less falsing.

Okay.....Can you break that down a little bit more for me? LOL!

IIRC, it adds a delay to the IO line in question, to make it more reliable.

that's as much as i can do. It's a wicked simplification.