Why is my Chevrolet Equinox having starting problems with new stereo?

[juslilbit2nite]

I have a 2005 Chevrolet Equinox. I have installed a Pioneer AVIC-F90BT with a Scosche Chime Interface. To get ACC (accessory) power to both, I jumped them into the heated seats fuse. When I try to start the car, nothing. No crank, noise, or anything.
If I disconnect them again, the car starts. What relation does a circuit for seat heaters have with the ignition system? Is there a better place to tie the ACC wires into? Thanks a lot.

A second question is for anybody on Equinoxcentral.com. I have tried registering there a few times and always get a confirmation e-mail, but cannot sign in. I have sent e-mails to the help address, but have never received a response. This has been going on for months. If anyone is registered there, could you please contact an admin for me? Thanks so much.
The Scosche interface is a DCGM16B and the instructions do appear to say it needs to connect to 12-volt ACC.

[KaeZoo]

Which Scosche interface are you using? Most of them don't require an accessory power connection; you just have to connect them to constant voltage and they'll produce a 12V RAP output to use for the radio accessory input.

If you're somehow connecting 12 volts to a data wire in the radio harness, that could certainly be causing your problem.

Edit: I took a look at the instructions for this adapter, and I think you may be reading them incorrectly. The only accessory wire on the module is an output, not an input; it's meant to be connected to the red wire on your after-market head unit. (There's a relay diagram that's not required unless your after-market deck or other accessories require more than 2 amps of current. It wouldn't be necessary to supply the accessory input of most after-market head units). No connection to a vehicle accessory circuit is required. The module generates its own 12v accessory output, by reading and interpreting the vehicle data bus signal.

I'd remove the connection to your heated seat fuse. The only thing connected to the red wire from the module should be the red wire from the head unit. It's possible that the accessory voltage is causing problems with the module. If disconnecting your extra wiring doesn't solve it, you'll probably need to replace the adapter.

Since the Scosche adapter communicates with your vehicle's computer system through the data bus connection at the radio, a malfunctioning adapter module could certainly cause problems with other vehicle systems--including the Passlock anti-theft system, which would prevent your car from starting.

[tomrharvey60]

I would recommend adding a relay so that you can come directly from the battery for your power. That way you can tie the relay to a lower amp switched circuit.

[THE_SILENT_LINE]

The acc wire is under the steering column

[Dave87gn]

the Equinox is loaded with electrical problems. I know 3 people with them, and they all have electrical problems :(