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Old 12-18-2002, 02:12 PM
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Join Date: Mar 2000
Posts: 532
Central Locking System Vacuum Pump Activation

How is central locking system vacuum monitored in the R129? Is there a sensor integral with the pump or is there a separate control unit? Could uncommanded operation of the pump in a system that has no vacuum leaks possibly be due to a fault in this pressure sensing circuit?
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Old 12-19-2002, 07:21 PM
Senior Member
Join Date: Sep 2002
Posts: 2,486
I once fixed a 129 for a similar complaint. The problem was a faulty glove box lock. Every now and then the pump was fooled into thinking that interior central locking was called for. 129's were the only cars with this feature. I hope this helps.
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