Wiring diagram for cadillac catera 2001 need to download free diagram radio and stero shut off occasionally which also locks trunk and fuel door

Its the K134 Multifunction Module. Its located under the drivers side dashbaord...

Fuel tank door is connected by cable to switch the cable must be worn out please check the cable which is connected gas tank lid and for the radio please check wiring of the radio there must be wiring fault in your car ,,,,,,,

K134 Multifunction relay is under the dash on the driver side. When sitting in driver seat, above your left ankle, it is located behind a cardboard panel. Replacing cures many problems with the Bose radio, sunroof, gas and trunk releases, fog lights.

The problem is with the body computer; my wifes 01 lost the fuel door, trunk lid, radio, clock and sunroof functions intermittently, but all at the same time. It became really annoying reaching through the back seat into the trunk to open the trunk.

I installed a used 99' body computer, took it to the dealer, reprogrammed the computer to accept the existing radio (when you switch the computer, the radio; Bose, will be locked out) because it's married to the car through the body computer. This is the security system used to protect theft of the radio.
If you remove the radio from one car and install in to another, the radio will lock out. You need a tech II scanner to program the computer.
Dealer charged me $120 for labour which is minimum 1 hour shop time. Actual programming took only 10 minutes. That's why GM is doing so well on the car market. I have no pity for them.

Change body computer (buy a used one).
Get it programmed by dealer because radio will be locked out.

most likely all three are on the same fuse try replacing the fuse if still doing same thing then you may have a short in the fuse box

The body computer is defective. Buy a used one, have dealer program it.

It's the body control module. It's located under the dash to the left of the steering column. I had same problem, went to the junk yard and bought one and the problem went away. Dealer wants $600.00-700.00 for the BCM, I paid $30.00

K134 Multifunction relay.

Did you recently have a loss of power to the car? change the battery? if so, you need to reset your system. My husband and I just figured this out this weekend. His sunroof hasn't worked in two years and it turns out you have to reset all the power options in the car. Google 2000 cadillac catera %calibrate ETC% loss of power, you'll find the step by step instructions for recalibrating the car's computer and resetting the power options