First of all the alarm and vacuum locks are activated by a micro switch on the vacuum element, and the convenience feature is activated by a switch on the door handle itself. The convenience feature is separate from the alarm. I have yet to run into a 90 or newer 124 without this feature although I can't swear it iwas an option. You can check easilly by removing the bottom section of the rear seat. The control module is located under the seat on the driver's side.

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Auto Zentral Ltd.

I have a 1991 300CE W124. I have a few items which I think are related to the Convenience Control Module:

1) My driver's window will not go all the way down with the auto-mode stopping about 10cm from fully open (always the same position). If I hold the switch and it will go all the way down. .until it gets atIt did begin fully opening a few times only to resume not fully opening but now it stops at a different position (but again, now always stopping at this new position). At this stopped position, the auto-mode will not work until the window moves down about 10-15cm and then will resume auto mode or it will fully open if I hold the switch. Passenger door seems to work fine. Note: driver's window motor has been replaced before I acquired the car.

2) I discovered the open and close with the key feature. It worked last night after driving the car at the driver's door and the passenger door. (I didn't try the trunk.) This morning... Nothing at the doors or trunk.

3) The driver and passenger door window do not open slightly when respective the door is opened and close when the door is closed. I am not completely sure that this is supposed to happen, but that is what I have read.

4) The passenger door lock does not seem to arm/disarm the anti-theft. At least, when I lock with the driver's door, and unlock with the passenger door, it sets off the alarm.

Question: Is the interior light supossed to illuminate when the car is unlocked? Mine doesn't but seems like it should.

Any advise on these issues or if they are related is greatly appreciated. Any way to test/recondition the convenience module? From what I have read it may not be completely solid state and my have relays in it.

I had the same hot/warm start issue with my 1989 300E with 95,000 miles. I changed the spark plugs and it got better. Changed the fuel filter (has only been changed once) and now it starts on the first try everytime without hesistation. Also, I did noticed a significant decrease in mpg's and started to smell gas. Turns out the rubber fuel hose from the fuel filter to the metal gas line was cracked and leaking. Ordered the special fuel line hose online for about $22.

I thought your oxygen sensor may have been defective but you said your car recently passed a smog test. I would, however, still suspect the sensor since it does regulate your air fuel mixture which may be running too rich at times.

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1989 300E

2005 Acura TL

2011 Hyundai Elantra Limited

Swing hard! Take chances!