please help stop the weirdness--long
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Instructor
Joined: Sep 2008
Posts: 177
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please help stop the weirdness--long
Posted also on Forum; Tech section suggested, here goes: Greetings, some strange happenings that have mechanic and me baffled. Car is a '99, 6 speed, all stock, no mods. Mileage is around 109K. I've had the car 8 years and put on 2-3K a year, long distance and local miles. Last year I hit rough, bumpy pavement on an interstate. Immediately all sorts of warning lights came on, variety of messages on the DIC, oil pressure and fuel gauges went to 0, but temp gauge went to 260. Radio went off but outside temp gauge stayed on. Windows would not go up or down. Pulled over, turned car off, waited maybe half hour, started up, everything normal for rest of trip (couple hundred miles), and the issue never happened again. Until Sunday. I hit a bump at maybe 5 miles an hour. Immediately got such messages as low fuel, check tire pressure, reduced engine power (but engine power was not affected), the dreaded ding ding ding, check gages, service engine soon, and the like. Kept driving about 10 miles. Turned car off, waited 20 minutes, started up, all normal, hit another bump, got the ding ding ding, etc., hit another bump and ANOTHER set of messages appeared. Monday took car to mechanic (3 miles away), all normal. With key on (but not engine) he started banging on the ECM and the fuse box in the footwell and the symptoms appeared. Further banging around eliminated the symptoms, back to normal. All fuses tight. Drove around rest of the day, all normal. Strikes me that hitting a strong bump causes something to become loose, another bump affects something else, another bump eliminates the warnings (brilliant deduction!). I have a raft of codes but only a few seem remotely relevant (?), such as B2282 and B2284, U1255, U1301, and the U1001-1254.. I get B2587 and 2592, column lock related (fix was done). No flood or water damage. Car always garaged. Any thoughts appreciated. Thanks, Larry
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,615
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From: Cape Coral, Florida
Check out the thread below this one...same thing almost...is this what you're seeing on the video ??...may be the Door Modules connectors inside those accordion tubes when you open the door...you'll see them...maybe an intermittent bad ground on some other module...disconnect the door connector and do a good visual inspection...corrosion, loose pins etc...power jumps on your serial data line intermittently and bing bang boom it's lights out for the car !!...don't go to a mechanic...don't even go to a dealership...they are CLUELESS !!...now it may come back so may have to do a little more troubleshooting if it re appears !!...best way to check is with a scan tool that can see ALL the modules...if you can't communicate with that module that's most likely the bad one !!
EDIT: don't let them bang on that stuff !!
EDIT: don't let them bang on that stuff !!
Last edited by C5 Diag; Jun 25, 2019 at 05:42 PM.
Race Director
Joined: Apr 2007
Posts: 11,152
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From: South Western Ontario
That is presenting as a problem on the serial communications bus. I'd check the wiring in the passenger door accordion first. Look for damaged wires going into the connectors and for the female pins being damaged.
