Relay location

[LRPMAN]

Where are the relays for the electric door locks? The key works the indicator on the door flashes yellow and green like it should. the fuses are good but nothing happens when you use the remote. It worked, went to the store and it quit, thanks for the help

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[99210]

i think door locks are not electric and are vacuum//controled by pse pump//dose your door close assist work

[LRPMAN]

ONLY things NOT working are the:
Door locks and the truck close assist also the handle for the trunk does not pop out.
Withe the remote you can:
Close the windows and sun roof but NOT lock the doors.
The door close assist and the pump under the RR seat area WORK.
All fuses are good
Now what PLEASE?

[wbrian63]

First - you're talking about a W140 car, not a W220. You might get better headway in that forum area.

Second - you say the pump under the rears seat works, but you can't lock or unlock the doors, and the handle doesn't pop out on the trunk.

There are only a few other things that pump does:

Release the rear headrests, if your car doesn't have reclining rear seat. Does this work?
Provide pressure for the lumbar supports in the front seats. Does this work?
Extend/retract the reversing aid masts (if your car is a 92, 93 or 94 - otherwise ignore this).
Extend the latching pawl on the trunk lid when you open the trunk. Do you hear a solid "click" after opening the trunk, coming from the area of the pin (pawl) that sticks out of the trunk lid?

It sounds to me like the PSE pump under the rear seat has gone south.

Do you hear the pump running when you attempt to lock/unlock the car doors? Do you hear the pump running when you unlock the trunk and it attempts to extend the grab handle?

It has it's own computer, and depending on the MY of your car, you can read the codes from the system and it will tell you what's wrong. For instance, if you've got a serious leak in the locking system, it will tell you. Each door has it's own separate hose for the lock actuator, so it can tell you which door is having issues.

I think most likely the pump has gone south, or you've got a leak at the connectors where they attach to the pump. Pulling the rear seat to gain access is a 5-minute job, max. I'd start with that and listen to what the pump is or is not doing when you lock/unlock the doors.