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electric gremlins?

  • slackware
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09 Mar 2019 11:00 #27684 by slackware
electric gremlins? was created by slackware
'08 Buick Lacrosse. 3800 v6
power door locks WORK when putting in drive or park. But from key, or unlock switch pot luck, locking or unlocking. some will work, others don't.
At first I thought it was the extra voltage from engine running, but put in gear with car off, and they all locked, and unlocked when put back in park.
Would they put TWO separate power lines to the locks?

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  • guafa
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09 Mar 2019 12:03 #27687 by guafa
Replied by guafa on topic electric gremlins?
Maybe a bad ground?

A bad ground contact can cause electromagnetic noises on electronic modules.

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  • cheryl hartkorn
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09 Mar 2019 13:19 #27688 by cheryl hartkorn
Replied by cheryl hartkorn on topic electric gremlins?
any codes? the door switch is a module

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  • slackware
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12 Mar 2019 11:00 - 12 Mar 2019 11:41 #27765 by slackware
Replied by slackware on topic electric gremlins?
No codes.
But the wiring diagrams are at my library. So am pulling them together. Crazy setup, putting signal, ground, switches, connectors, and wire routing in separate places.
Haven't found the shifter control signal yet, since it works, the problem has to be from a branch after it, or it triggers something else to open and close the locks..
Switch is used for rear trunk release as a press and hold, and it opens the trunk, and I haven't found that wiring yet either. It all should go into the BCM at some point I would think.
Ohh, the alarm thinks it locked the doors. If you open it to press the door lock you set off the alarm.
Last edit: 12 Mar 2019 11:41 by slackware. Reason: add symptom.

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14 Mar 2019 00:20 #27797 by wacoeagle
Replied by wacoeagle on topic electric gremlins?
LOOK FOR relays..

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14 Mar 2019 14:45 #27815 by Desmond6004
Replied by Desmond6004 on topic electric gremlins?
I'm just wondering if putting it in gear simply forces them all to lock regardless of their state while perhaps using the key or remote first checks that they are all closed properly and won't lock them if they don't show as latched - perhaps bad switches in the doors that don't lock?

Getting involved in discussions because I have a lot to learn still.

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