I just purchased an alarm control unit pt #203-820-27-26 for an s430 does annyone know if this unit needs to be reprogrammed by an M.B.dealer in order to function.
2nd when the alarm system is engaged does it neutralize the starter.
mb_buddy

Is that part number actually the PSE pump? It would have a bulge in the housing that looks like there would be an electric motor underneath, and vacuum lines attach to it to run the vac actuators. That is usually the heart of the anti-theft system. It does need to be version coded. i don't believe there is any engine interface. I believe it can shut off the fuel pump, but only in an accident, it has it's own crash sensor to do this. It will also activate the hazards in case of a crash, and unlock the doors if they were locked. As far as anti-theft systems for the engine, the smart key has that pretty well covered, the engine control unit won't be released to operate without the EIS (Electronic Ignition Switch) giving it's official okey dokey......Gilly

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Gilly, this control unit has no vacuum lines it is just a plain control unit situated under the right rear seat. the car in question does not turn over and the components under the right rear seat were stolen from the car everything has now been replaced.the car was sitting for at least 6 months
with the battery been disconected.we are not sure about this control unit if after it being installed it needs to be programmed.i was also told that the alarm system reprograms itself after a good battery is connected to the car all lighting seems to function in the car,is this true or is there a set of operations that need to be performed in order to reset the alarm system.

mb_buddy

"restting" the alarm system doesn't make sense, you may need to have the module version coded at a dealer. I'll check on Monday to see what the module is "really" called that you have and get back to you......Gilly

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PS: seperate out 3 systems and tell me what works: central locking (locking and unlocking) anti-theft alsrm (lock car, wait a minute, reach in and unlock doors, does the alarm activate) and DAS (driver authorization) allows engine to start, I can already guess DAS is not authorizing a start, as the car won't start. Does it crank or just crank and no start?....Gilly

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What I also need to know is when you put in the key, are you able to turn it to start, or is the ignition switch staying locked?.....Gilly

Buddy: The part number you gave me can have 3 names. You can call it the Towing Protection Alarm Unit, the Anti-Tow sensor, or the Inclination Sensor. When the alarm system is set, it senses if the car has been tilted, as though being towed away (the only "good" way to steal one), or if someone is jacking it as if to steal the wheels. It is not on the interior CAN bus, it reports to the rear SAM, which then transmits the anti-tow sensor signal on the CAN. It needs no programming at all. The part number you gave was for 2001 only, a 2000 part number is 202-820-38-26, that number may convert over to the number you gave though, I didn't check. I'm sure it's a minor difference. The alarm won't keep the car from starting. I found this out tonight on a 2001 S430 I did a PDI on. I set the alarm off, then as soon as you put the smartkey in the ignition, the alarm shut itself off. If the key is inserted and won't turn, you have other problems. If the key does release and turn, but the car won't crank, go back to basics and check for a crank signal at the starter, we have had a couple bad starters on 112/113 engines already. As a general rule, any component without CAN wires won't need to be programmed. If a component does have CAN wires running to it, it will at least need to be version coded......GILLY

gillytech thanks for the update and help I haven't replied to your other inquires because I'm not near the car this week.i will get you those answers next week. 1. I know that the car doesn't crank when key is turned to crank,it doesn't jam.but there was an alarm-buzzer that went off when we attempted to crank it,this again was before receiving that anti-tow sensor.what is meant by CAN and SAM.i will also verify the central locking system and get back to you asap/.
mb_buddy

CAN is controlled area network, it's MB nomenclature for the information bus, 2 wires taking the info from different areas of the car and sharing it. There are several SAMs on the interior CAN (there are 2 CANs to worry about, the interior CAN and the engine CAN, there are a couple other independent CANs, but these 2 are the biggies). A sam is a system activation module, it's a convenient way to divide up responsibilty throughout the car. Since the anti-tow sensor is under the seat, instead of putting the sensor itself on the CAN, the sensor "reports" its status to the rear SAM, which then puts the anti-tow sensor status on the CAN. The appropriate control module will then recieve the info from the anti-tow sensor via the CAN. Many items are also controlled in this manner, for example the exterior lights are not hardwired to the switch (well, there are exceptions there, too) but in general, the light switch is actually a control module calling for the various SAMs to do the dirty work of sending electricity to the lights. Also you notice when opening the trunk there seems to be a very small delay for the trunk to actually unlatch, that is because by pushing the button on the trunk lid is actually just a switch which signals the rear SAM (in this case) to "open the damn trunklid!"(in German, I'm sure). I would proceed with caution in regards to the starting complaint. This may not be easy, but by the same token, remember your basics. If the key is releasing (turning), it should try starting. I am unsure what the buzzer you heard is. Is it buzzing in the cluster, like a lights-on reminder? Is there a warning displayed in the cluster, in the area of the odometer field? Anyways, as far as the basics, make sure the battery is fully charged, and check for a crank signal at the starter. There may be a relay involved here, this is an unusual complaint, so I'd be breaking out diagnostic manuals if the crank signal is missing at the starter. To be honest, I am leaning towards recommending a dealer look at it, but if you are determined, let me know if you need more help. Also, if I remember correctly, I believe I read that the car should try to start even with the anti-tow removed, it might make a difference if the alarm was set when the part was stolen, so yeah, try it with the anti-tow sensor installed, then lock/unlock the car and try it again.....Gilly

gilly ,well I'm back near the car.
1 the remote does not unlock the drs,the light on the remote goes off when you press it to unlock the drs i am not sure if it suppose to remain on until the drs are unlocked, no matter drs do not unlock using remote.
2-key does not turn inside the ignition only .the only way key was made able to turn was by jumping a sensor in the ignition but it never allowed full power to all circuits.
3 if you lock the drs and you open a dr from the inside it does not set off the alarm.....
by what you're saying the important system is the starting system since the others will not overide it,but the starting will overide the alarm .......mb_buddy

[Edited by mb_buddy on 05-16-2001 at 10:27 PM]

Sounds like "dealer city" to me, Buddy.
1. The red LED on the key means "nothing", almost. It is a battery check function, and is also used as an indicator for when the key program is changed from "Global" to "selective", see owners manual.
2. I am not familiar with any way the key will release to be turned unless the key and EIS exchange pleasantries. No other outside influences will release the EIS, if you got it to rotate by somehow jumping something, i'd like to know what it is that you are jumping.
3. If the remote is not unlocking the doors, it probably won't lock the doors either, so the alarm is probably not actually being "set" to begin with, which is why it isn't going off. Do the locks work with the console switch? Since you can't get power to all circuits, you probably don't know for sure. Get back to me on this, I'd like to help, but really i think the car needs it's "mama".......Gilly

gilly 1st thanks 4 your help and advice,and i am considering it more and more-the dealer thing but i am going to probe your knowledge a it more 1st.
1 this whole system if the bags did deploy would it disactivate the ignition circuit/and if it did is it a reprogramable system or is it something like a relay that you have to turn back on/and location?
2if the ignition switch was pulled would this immobilize the ignition circuit/making it necessary to reprogram
3where is this pse pump/alarm control unit 4 alarm system
4overiding system if someone brakes window to access car than has right key for car can he than start car.
hey thanks again..............mb_buddy

1. I'm not sure, haven't had one smashed all that badly yet. I believe there is a safety circuit to shut off the fuel pump. Sounds like the major problem with the starting problem is the DAS being released, not anything else really. On many of these cars, the SRS (airbag) control unit is a one-shot deal, I'm not sure about the 220 chassis. If I think of it and get time, I will research it.
1a. What the hell happened to this car?
2. No, I don't believe pulling the EIS will screw it up, should work OK.
3. I believe the PSE on a 220 is under the rear seat on the right side. Look for the plastic vacuum pipes leading to it.
4. If you leave a window open on a smartkey car, with the alarm set (doors locked), and reach in and open the door, the alarm will go off, then you can just put the key into the EIS and the alarm will stop, and the motor will start. Question #4 wasn't really posed as a question, but if that is what you are asking, I would say yes, if you break the window to get in, but the key is working, it should start. The smartkey has a metal blade to get into the car though, so I wouldn't think this should have to be done unless the central locking quit working (maybe a dead car battery) or the key took a dump or has a dead battery, AND the metal blade is missing. DOH!
Gilly