Hi
I recently bought a 300CE and changed the passenger side presenter, which now works ok, except it always presents, whether there's a passenger or not, and retracts after about 30 seconds. The driver side retracts as soon as the belt is buckled.

I guess (please correct me) there are 2 switches, one to detect pressure on the seat, the other to detect the seat belt in the buckle. I suspect these are in series, the seat belt switch normally closed, and the seat pressure switch normally open. The passenger sits down, the belt presents, engage the belt and the circuit breaks, and the belt retracts.

Can someone please confirm/correct my thoughts? A bonus would be the part numbers of the switch(es).

escosys, I own a 1991 300CE and removed the fuse so the seatbelt presenters do not work. They are a nuisance, in my opinion, and only confuse the occasional passenger who is unfamiliar and not expecting the presenter. It's a simple matter of reaching your hand back, palm down, just above the door sill and grabbing the seatbelt. In my car the trim piece in the rear pod was loose, and the seatbelt presenter only compounded the problem.

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Fred Hoelzle

Its only supposed to present if the passenger door is opened. The switch for it is in the door jamb. It retracts when the seat belt is buckled or it times out.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

So there's no sensing of a passenger in the seat?

nope

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Wait a minute, guys. I don't know if the '97 CL500 and 600 are different than the CE series but in both of those cars two things have to happen. 1) the door has to open, and 2) there has to be weight on the seat. This can be a bag of groceries or a six pack. I had a CE320 at one time but honestly don't remember how they worked. Your manual should certainly give you that information.
I've had trouble only once with the three cars that had presenters and it was a simple fix. There is a cheap plastic gear that wears out. There is a metal replacement found on Jim Forgione's great website.
Anziani

They are, significantly.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Well of course the cars are different. I meant the seat belt operations.
Anziani

I did too. The CE has nothing in the seat related to the presenters aside from the seat belt buckle switch.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

No, that's not the experience I have with mine 98 CL500. When
I let passengers off, upon shutting the door, the presenters always extend,
regardless of weight in seat or not.

I have not seen any circuit drawing or sensor reference to support
statement 2 above, either.

br,
syljua

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1998 CL500 W140
1984 230E W123

syljua, Yes my '97 Cl600 does the same after the bag of groceries is removed. The question was do the CE series act the same? Apparently not from these responses. My old CE320 is still in the area. I'll track him down and take a look.
Anziani

I've had at least three seat belt presenter control modules in my car. The issue in my car is that water can get in (cabriolet), and it pools under the right rear passenger seat, drowning the module. Because it is charged with electricity and made of many dissimilar metals, corrosion sets in rapidly and ruins the module. The one I have now is a good one. But I took it out of the car because water still pools under the seat and I don't feel like drilling drain holes in my car.

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95 E320 Cabriolet, 159K

Kestas, That certainly sucks! Any way you could relocate the module?
Anziani
'97 CL600 58K

I recall reading a post here years ago where the author said he got a seat belt clip from a wreck and would clip it in the latch to keep the presenter from extending. My driver's side presenter hadn't presented itself in years, until once this summer it actually came halfway out. I've taken to fastening the belt before starting the car. Can't stand to hear the motor run and no arm come out.
Nothing at all on my passenger side.

dynalow, sounds like you have a stripped gear in the mechanism, a common problem. On Jim Forgione's great website he has a blip on it with a solution. There is a guy who makes metal replacement gears. I had the same problem as you years ago, bought a metal gear and it worked great until I sold the car. I love the shocked look on people's face when the arm is right next to their head.
Anziani
'97 CL600 58K