PetrofMII

I pulled the stock radio in my 2003 M6 convertible, installed a BT module, and reassembled. To power the BT module I ran the included wire to the included mini-tap (add-a-fuse) circuit which plugs in to the fuse 11 spot in the interior fuse box, and includes a slot for the old fuse.

The car starts, immediately dies, throws "Reduced Engine Power", "Service Engine Soon", and "Low Fuel". HVAC powers on but the radio does not. Coolant temp gauge is maxed, oil pressure and fuel gauges are at zero. Battery charge appears accurate. Prior to pulling the radio, everything was functioning properly.

I'm posting this in the (vain) hope I just popped a fuse, because if it's more than that it will be time to have it towed to the local Corvette specialist. I guess I'll be purchasing some electrical test equipment soon...

lucky131969

From the hip.......Start with removing whatever you put into fuse 11 location in the IP electrical center. Then inspect fuse 47 - IGN 1 (60 amp) in the IP electrical center to see if it's blown.

jcj63

If you unplug the BT module at the fusebox, will the car then act normal? If it is still a problem, trace your wiring and look for a pinched wire. Actually, trace your wiring either way. If it starts running normal you probably still have a wiring problem. I did the same thing with a BT module and everything worked fine so you're not doing something funny.

mmartinez

You have managed to mess up the serial data buss, it is a single wire that connects all of the cars electronic modules. If you look for codes thru the DIC I am pretty sure you will have no comms on all the modules.

C5 Diag

With what you described sounds like a serial data bus issue…I’d unplug that radio and then see what happens…I can do what you’re seeing by just applying a power or ground to the data bus…what other wires do you have connected to your BT and to where ??

PetrofMII

The BT module sits between the passenger side 20-pin plug on the back of the radio and the socket; essentially mates between them with its own socket and plug. The only other BT module connection is a wire to draw power from the accessory line at fuse 11, joining the "add a fuse" mini-tap that is in now in that fuse location.

PetrofMII

Correct; DIC displays NO COMM for all sections.

PetrofMII

I just got back home and pulled the mini-tap from fuse 11, which is what supplies power to the BT module; no change. Thanks for the suggestion!

PetrofMII

When you say "plug that radio" do you mean remove the BT module from the radio connection (just uninstall the BT module)? A serial bus issue sounds accurate based on yours and @mmartinez descriptions, as the DIC is getting NO COMM on all the modules. Given that, it does sound like the car will need help from someone with more ability (and test equipment) than I possess.

C5MSG2004Vert

Just disconnect the BT device from the radio and the car radio plug. It's probably shorting the Data Bus or appling a voltage to it. That should fix your problem.

lucky131969

....and what about fuse 47 - IGN 1 (60 amp) in the IP electrical center ?

PetrofMII

It did; thanks! I pulled it all apart, left the radio unplugged and car was fine. Plugged in the radio, still fine. Reinstalled the BT module without mounting the radio yet, still worked. I then worked the wiring and module back in the cavity in a different manner and screwed down the radio, and started the car to begin my victory dance. So I assume I "pinched" something inadvertently the first time; stupid rookie mistake.

As usual, taking everything apart the second time took a fraction of the time that the first attempt did. That center trim piece surrounding the HVAC controls and the radio is a right nasty beast, though.

PetrofMII

Sorry; should have responded to you earlier; that fuse was fine. I think in the first install I just messed up the placement of the wiring. Thank you for the input, though, it was certainly worth the small effort to check. I really need to get a new digital multimeter.

lucky131969

No worries. I've never seen anyone shut down a car with a BT module, so I'm curious what you did.

PetrofMII

I wonder that as well; how did moving wiring around "fix" a serial bus issue? Or rather, how did the first wire routing create the issue? Certainly freaked me out enough that I thought I'd fried something.

C5MSG2004Vert

This bluetooth module plugged into the radio connector and then it was connected to the radio. It seemed to be that the plug was shorting out or connecting the databus to a voltage.