Quote:
Originally Posted by dieselbenz1
I would start at the pump under the rear seat you can check the signals you are getting at the electrical plug. If I remember correctly +12 to one terminal pressures the system to open while another terminal +12 creates vacuum to lock the doors.
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Finally had some time to diagnose this issue, and used this method. Got to the pump, pulled the connector, and verified that each of the three locks (RF door, LF door, and tailgate) all gave the correct signals, which means the problem is in the pump circuitry.
I've also determined that all 124 models used the same pump, and I've got a spare somewhere in the garage.
I'd like to learn more about the circuit in the pump, and see if that is repairable.