Guest speedfreek155 Posted January 22, 2017 Share Posted January 22, 2017 Hi , I've had my 1990 Reatta now for 2+ years , and have been able to find the answer to every issue I've had , until now . I have recently had an issue with a relay (relay H) clicking off and on in an almost vibrating manner , it affects the radio , sometimes the climate display , headlights and the Door Ajar light in the dash . It happens mostly when cold . I have cleaned and checked all grounds (I believe all) , I replaced relay and even battery lugs to no avail . Currently when I start car , if relay doesn't act up , everything seems fine , but when I shift into gear the Door Ajar light illuminates on the dash . Any input would be greatly appreciated and thanks in advance . Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted January 22, 2017 Share Posted January 22, 2017 Thank you for the input , but unfortunately I went into diagnostics , and showed no codes current , just historical . IAlso looked through my shop manual and couldn't find a solution for this specific problem . I will keep plugging along . Of course I have a spare ECM but no BCM to test Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted January 25, 2017 Share Posted January 25, 2017 As I have been going through troubleshooting I noticed that the door ajar light doesn't come on until i engage into gear . Tonight coming home , cold and light snow , the relay was going nuts and almost turning lights off and engaging and dis-engaging high beams , along with shutting down radio as usual. Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted January 28, 2017 Share Posted January 28, 2017 (edited) I did comprehensive ground cleaning today , thought it may be good , but after short trip to store the relay demon reared its ugly head again . I am going to have to pull BCM and inspect board for bad solder connections and touch them up if I see any . Edited January 28, 2017 by speedfreek155 (see edit history) Link to comment Share on other sites More sharing options...
Ronnie Posted January 28, 2017 Share Posted January 28, 2017 If the BCM is causing the problem relay J should be chattering when relay H chatters. They are both grounded by the BCM on the same circuit to pick them up. The next time it happens, turn on the courtesy light in the mirror and see if it's flickering when the relay is chattering. Usually a relay chatters because it isn't getting enough current to keep it picked up. That could be caused by a poor ground circuit or power circuit. If it were me I would replace RAP circuit breaker #25 and make sure it is clean and tight in the socket. 1 Link to comment Share on other sites More sharing options...
Bushwack Posted January 31, 2017 Share Posted January 31, 2017 FWIW, I've had the door ajar light come on in two different Reattas. As part of troubleshooting, the BCM will not accurately tell you which door is in 'trouble'. If after all of what Ronnie posted has been done and still have that warning light on, as was my case, I'd concentrate on the passenger door first. Yes, makes no sense as the driver's door gets more exercise. Nevertheless it was the passenger doors on both cars that were giving off the warning light. 1 Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted February 3, 2017 Share Posted February 3, 2017 On January 27, 2017 at 9:06 PM, Ronnie said: If the BCM is causing the problem relay J should be chattering when relay H chatters. They are both grounded by the BCM on the same circuit to pick them up. The next time it happens, turn on the courtesy light in the mirror and see if it's flickering when the relay is chattering. Usually a relay chatters because it isn't getting enough current to keep it picked up. That could be caused by a poor ground circuit or power circuit. If it were me I would replace RAP circuit breaker #25 and make sure it is clean and tight in the socket. First , you are correct , both relays H & J are chattering , and the light on the mirror flickered accordingly . RAP relays checked and bypassed with jumpers (temporarily) but problem persists . I have not found a process for removing BCM for inspection , I would really like to look inside unit . In my experience with electronics , It seems like there could be a bad connection or crack on PC board . Link to comment Share on other sites More sharing options...
Ronnie Posted February 3, 2017 Share Posted February 3, 2017 (edited) If you feel the BCM is causing the problem you should buy one that is known to be good and see if that solves the problem. Then experiment with the old one to see if you can find the problem with it. It's always good to have a spare. OR you could ground the circuit right at the relay, bypassing the BCM, then drive the car and see if the relays still chatters. That would tell you if the problem is the BCM, the relay ground circuit, or the circuit that supplies power to the relay... Edited February 3, 2017 by Ronnie (see edit history) Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted February 4, 2017 Share Posted February 4, 2017 On February 2, 2017 at 9:57 PM, Ronnie said: If you feel the BCM is causing the problem you should buy one that is known to be good and see if that solves the problem. Then experiment with the old one to see if you can find the problem with it. It's always good to have a spare. OR you could ground the circuit right at the relay, bypassing the BCM, then drive the car and see if the relays still chatters. That would tell you if the problem is the BCM, the relay ground circuit, or the circuit that supplies power to the relay... I actually thought about doing this , was going to investigate any possible ramifications first , I thought I may have to diode isolate additional ground so there is no feedback in the circuit . Link to comment Share on other sites More sharing options...
Ronnie Posted February 4, 2017 Share Posted February 4, 2017 Re-seating all the BCM connectors might fix it. Spray with some DeOxIt while you have them off. 1 Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted February 5, 2017 Share Posted February 5, 2017 5 hours ago, speedfreek155 said: I actually thought about doing this , was going to investigate any possible ramifications first , I thought I may have to diode isolate additional ground so there is no feedback in the circuit . Added aux ground to relay circuit , didn't have and chatter from relays , but the power retention didn't shut off systems , I tried it numerous times and nothing , so it's time for a BCM . I will post results when I receive it . Link to comment Share on other sites More sharing options...
Guest speedfreek155 Posted February 17, 2017 Share Posted February 17, 2017 Installed good BCM , no more relay chatter ! Now to track door ajar issue , Thanks for all the input Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now