Danpatters583 Posted April 17, 2022 Share Posted April 17, 2022 So, after putting off looking at the wire splices on my '90 Reatta for about a year, I finally decided to start the job. Ive been having alot of issues with my power locks, mirrors, interior lighting, trunk release ect. After scouring the forums it appears that this woukd be my problem. A Broken wire splice or two. I got to the splices and so far have checked about half of them and there is no corrosion or anything out of the ordinary. Im a bit confused since my fuses appear to be good. So my questions are as follows. 1) Is there something else I should look for? I saw something on on google about a power supply module? What does it do? 2) is it possible the body control module could cause all these problems? Thank you all for your help. Link to comment Share on other sites More sharing options...
Padgett Posted April 18, 2022 Share Posted April 18, 2022 Thee is a central power supply module but it mainly provides 7vdc for the instrument and not 12vdc for the items you mention. I'd put a 12v power monitor in the cigarette lighter and see if it jumps around. Like this. Link to comment Share on other sites More sharing options...
Danpatters583 Posted April 18, 2022 Topic Author Share Posted April 18, 2022 I did happen to notice my instrument cluster is intermittent all of a sudden. I got multiple issues apparently. Link to comment Share on other sites More sharing options...
Ronnie Posted April 18, 2022 Share Posted April 18, 2022 12 hours ago, Danpatters583 said: Ive been having alot of issues with my power locks, mirrors, interior lighting, trunk release ect. Are they not working at all or is this something that is intermittent? Link to comment Share on other sites More sharing options...
Danpatters583 Posted April 20, 2022 Topic Author Share Posted April 20, 2022 None of them work at all. Haven't since I bought the car. Link to comment Share on other sites More sharing options...
Ronnie Posted April 20, 2022 Share Posted April 20, 2022 I would look at all those components not working as separate issues even though they all might be related. Start with the interior lights. Do a little test to see if the problem is with no 12 volt power or with a ground. Interior lights are controlled by the BCM on the ground side of the light. I'm assuming you have a coupe and I'm assuming your '90 is like my '88 model... Remove the cover from the overhead (dome) light so you can see the bulb. Use a meter or test light to check each side of the bulb for power. One side should have 12 volts. If it does, ground the other side of the bulb and see if the bulb comes on. If it doesn't, replace the bulb and repeat the test. Let us know what you find. 1 Link to comment Share on other sites More sharing options...
Danpatters583 Posted April 22, 2022 Topic Author Share Posted April 22, 2022 On 4/20/2022 at 10:02 AM, Ronnie said: I would look at all those components not working as separate issues even though they all might be related. Start with the interior lights. Do a little test to see if the problem is with no 12 volt power or with a ground. Interior lights are controlled by the BCM on the ground side of the light. I'm assuming you have a coupe and I'm assuming your '90 is like my '88 model... Remove the cover from the overhead (dome) light so you can see the bulb. Use a meter or test light to check each side of the bulb for power. One side should have 12 volts. If it does, ground the other side of the bulb and see if the bulb comes on. If it doesn't, replace the bulb and repeat the test. Let us know what you find. It is set up like that. Ill check once I finish looking at the splices. Also, where is the bcm located? I haven't looked at the manual yet. Link to comment Share on other sites More sharing options...
Ronnie Posted April 22, 2022 Share Posted April 22, 2022 The BCM is right behind the glovebox. Remove the glovebox and it will be the silver box with lots of wires going to it. Link to comment Share on other sites More sharing options...
Danpatters583 Posted April 22, 2022 Topic Author Share Posted April 22, 2022 9 hours ago, Ronnie said: The BCM is right behind the glovebox. Remove the glovebox and it will be the silver box with lots of wires going to it. Thank you. I'll let you know what I find. Link to comment Share on other sites More sharing options...
Danpatters583 Posted April 23, 2022 Topic Author Share Posted April 23, 2022 On 4/20/2022 at 10:02 AM, Ronnie said: I would look at all those components not working as separate issues even though they all might be related. Start with the interior lights. Do a little test to see if the problem is with no 12 volt power or with a ground. Interior lights are controlled by the BCM on the ground side of the light. I'm assuming you have a coupe and I'm assuming your '90 is like my '88 model... Remove the cover from the overhead (dome) light so you can see the bulb. Use a meter or test light to check each side of the bulb for power. One side should have 12 volts. If it does, ground the other side of the bulb and see if the bulb comes on. If it doesn't, replace the bulb and repeat the test. Let us know what you find. So I tested the light bulb. Zero volts. New bulb is installed no difference. Ill dig a little further later. Boncing back and forth between a few different things right now. Link to comment Share on other sites More sharing options...
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