2000 Catera Sport Radio Problems

barryr · #1 (**permalink**) 12-28-06, 07:20 PM

Just bought a 2000 CAT Sport for $500.00 with blown motor. Replaced with newer motor and have the vehicle back up and running!! Was out test driving and getting the Check engine light cleared. When I re started the car the radio won't come on and both the truck and fuel door switches don't work. I've checked the fuses all were good. Could someone please point me in the right direction??
Thanks

lakesidepark · #2 (**permalink**) 12-29-06, 12:42 PM

Possibilities?
1) the "multifunction" module is failing and powering down the circuit due to "low-power" fault. you did not say if the radio works when the car is off, or if it works and fails. Do your trunk and fuel door still work with the remote? Try this - use the remote when the car is running and the radio has failed, and see if it causes the radio to come on. If it does, it is resetting the module (because voltage is applied to the opposite side of the failure when the remote is used). I never fixed mine - I just soldered a jumper across pins 12 and 14 of the module. When it chokes now I lose my interior lamp but the radio stays on (I'll replace it someday).
2) There are TWO fuses that control the radio - one powers it when the car is OFF (twilight mode) and the other when the car is ON. If radio works with car off but not ON check those fuses again.
3) Failing heater auxillary water pump - will cause the multifunction module to "low-power" fault the radio circuit....strange but true.

contourbs · #3 (**permalink**) 12-30-06, 12:37 AM

yeah replaced the battery and you will be good to go

barryr · #4 (**permalink**) 12-30-06, 08:28 AM

Thanks for the tips..I got the trunk and fuel door to open but only when the car is running and in gear!! Still no radio, either when car is on or is off. I don't have a remote to try one didn't come with the car. Where is the maltifunction module located??

pizzolanti · #5 (**permalink**) 01-07-07, 01:19 PM

Did you ever figure out what the problem was? I have the same problem on my 98 and would welcome any suggestions.

pizzolanti · #6 (**permalink**) 01-07-07, 01:23 PM

Hi. It seems like you know about this particular problem. Could you help me in figuring out what it is. I have the same problem with mine. My radio works when the car is off but not when it is running.

barryr · #7 (**permalink**) 01-07-07, 09:28 PM

What I was able to figure out from all of the tips in this forum, is that the radio circuit is powered by a variety of different circuits. I went after the multifunction switch as both the fuel and trunck buttons would not work as well as the radio. I jumped pins 12 & 14 of the switch and everything worked. The only problem is the radio had to be turned on every time I started the car. I changed the switch and everthing works fine now.

pizzolanti · #8 (**permalink**) 01-10-07, 05:00 PM

I see you found a bcm module at a junk yard for $2.00. Is that what you replaced and the radio worked? Are you still having problems with the radio? Thanks for your suggestions.

barryr · #9 (**permalink**) 01-10-07, 05:19 PM

Wasn't the BCM modual, it was the "Multifunction Switch". Once replaced all my radio problems and several others went away. The junk yard I use is a pull it yourself place, the counter help doesn't know what the part is out of or what it does, great place !

pizzolanti · #10 (**permalink**) 01-10-07, 05:41 PM

Hey, see if they have the bcm Module. I am willing to pay $50.00 plus shipping.