Dtkw, you say could be switch. Could you breifly tell me how to check it? Sorry for being a dumbo on this.What did you fix on your locking pump, does the pump run. If it does, it should activate some thing. If the pump does not run, it wont operate your lumbar, headrests if you got vacum ones, or HVAC support.
Help a LITTLE?? Whoa! That was dead on! Thanks Peter! I take it I'll have to pull the rear seat on this one? Is there a "screw trick" to this one, as well? (please let there beThe 140 series of cars had two pumps. The one over the rear wheel "CLOSED" the doors and trunk lid. This means it pulled them in after the first catch is noticed by the pump computer. I was a little leery about the screw trick, but it seems to be working for some people. I had a second go bad and MB replaced it at N/C after almost a year, never attempted to fix the first.
The second is a locking and unlocking pump, this pump is located under the passenger rear seat in a foam enclosure. This pump provides vacum/pressure to lock and unlock the doors, trunk, gas door,lumbar, HVAC assist, rear headrests if you dont have electric seats, and the trunk handle on some cars (there was a mod to use the closing pump for this). If the handle and lid go in at the same time, you have the mod, if they seemm to be independent (delay) you dont. This pump runs forward and backward to lock and unlock the doors, and gets its input from the keys in the front doors and trunk, the switch in the inside, and also from the "remotes". Those pumps dont go bad as often.
That should help you a little
Holy Crap! You just saved my bacon sir! Do you know how hard it is to come by this information? I stupidly removed my pump to avoid a core charge and completely forgot where the lines went.Peter Guenther - 9/6/2003 1:42 PM
ZV Connection for lock & unlock YELLOW hose
RH Connection for backup asist rods ORANGE
SFG Connection for trunk lid grip BLACK
FKS Connection for headrests (non power rear seats)
P+ Connection for orthopedic GRAY
P- Connection for manifold vacum HVAC CLEAR
Are there any hoses attached? I see the ports in AllData, but there's no mention of anything hooked to them.Does anyone know what the TBS lines are for? On the manifold (for the pre-facelift pump), there are four would-be cut-outs for TBS...
And, can someone tell me what exactly the pump does for the HVAC system?
I think the extra plug you're talking about is the interface connector for the anti-theft/alarm module (N26), plus one wire to the HVAC controller.this thread is awesome.
Also, does anyone know what the smaller plug on the vacuum pump under the rear seat is for? Someone hacked up my wiring harness. I got the main plug wired back up fine, but the small one that plugs into the pump right next to the large one still has wires leading to nowhere.
I cannot even find a reference to it in alldata. I see the connector, but i can't find the wiring diagram for it.
This concerns me because my side vents don't work, and i think it may be because those wires aren't hooked to anything.
Thank you for your help. I'll do the test when i get back to the shop.I think the extra plug you're talking about is the interface connector for the anti-theft/alarm module (N26), plus one wire to the HVAC controller.
NOTE - these values are for a '93 300SEL - your wiring harness may be different
I found the pinout in Vehicle / Diagrams / Electrical Diagrams / Antitheft and Alarm Systems. This is what I found:
Pin 6 - Blue - N26 Pin 11
Pin 4 - Blue/Gray - N26 Pin 19
Pin 5 - White/Pink - N26 Pin 24
Pin 3 - Brown/Green - N26 Pin 26
Pin 2 - Brown/Pink - N26 Pin 25
Before I'd reconnect any of these wires, I'd pull the connector from N26, which is in the trunk and is the only non-rectangular module mounted to the upper right of the fusebox. Test connectivity from the pins back to your open wires before making any repairs.
I'm afraid this has nothing to do with your side vents.
Silly question, but you do have the valves open for the vents (the outer pair of dials below the center vent), right? If they don't work at all, I'd suspect the multiplexer device behind the glove box. Everything HVAC is controlled from that device which is controlled itself by the main HVAC control in the dash.
There is a flapper test program for the HVAC to help you diagnose problems just like these: Vehicle / Heating and Air Conditioning / Testing and Inspection / Component Tests and General Diagonstics / Component Tests / Individual Flap Test in AllData gives you the procedures. It should point you to where the problem is preventing the side vents from opening up...