My radio, trunk and fuel door all work sometimes. Where is the Multifunction relay? I believe the part# 90494163 It is a 2000 Catera Cadillac. Thanks

I would think it may be something bad in a Relay , it may not be working and its keep consuming energy , check the relay box in the engine area beside the battery. You have to check each to see which one is not working. I ll check this first going to other step.

Fuel door and trunk issues? How about no fog lights and your radio randomly turning off. If you have any of these issues it is the k134 multifunction relay. It controls all of the above.

the K134 relay is a multifunction relay the controls the proper operation of the radio, fuel door, and the trunk. As far as I can tell the A/C is a separate issue and the check engine is most likely related to the relay being bad.

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

K134 Multifunction relay is on the driver side, inside the dash above the driver's left ankle (area). (2) panels need to be removed below the steering column to access this area. The first is a panel that matches your dash. The second is a cardboard panel with foam padding on it that encompasses the arms holding the brake pedal and accelerator. You'll then need to lay on your back on the floor board, head in first. Look for a gray box about 3" square by 1 1/2" thick. Push it 'up' off of it's mounting bracket to release. Unplug the wiring harness. Plug in new relay and re-mount.

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

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

it could be a relay. the trunk switch is controlled by a relay. there are some relays in the fuse box and there are some in the larger fuse panel that is located under the hood.