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97SL500R129, 01ML320W163, 94E320W124 & 93500EW124
2,930 Posts
automatically unlocks itself!!!

The symptom indicates that your lock/unlock circuit is shorted (or grounded) somewhere where it shouldn't be. Check/test all electrical and vacuum connection starting with with the vacuum pump, all doors and the trunk. Start with the drivers door since it is used the most.

Good luck! and please report back your findings.
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