Alarm 3G EWS How do I remove it????

[johnc46]

I hope it's the correct tile, I am wanting to remove the above from my 97 1.9 Z3. will disconnecting all the components affect the original key operated central locking or cause me any other problems.
I have the brick type fob to go with it if anyone is interested, fob lights up when button pressed, the alarm itself when the battery is disconnected is not loud just gives out a sort of high frequency tone is the best I can describe it, they may be like that I have no idea, any help would be very welcome.

 

[NZ00Z3]

I think you may have two systems sort of confused in your title.

The early Z3's had an anti theft system made by Alpine. Its one of the modules under/behind the glove box.
It provides the following functions:
- Allows the key fob to provide remote central locking
- Monitors door switches etc and set off an alarm if one is opened when the alarm is active.

Have a look in the "Resources" on this forums web page and find the wiring diagrams for your car. You can then look up and see how it connects. People often remove or install these alarm systems.

You Z3 also has a EWS security system. It does the following:
- Checks that the key in the ignition is coded to the car.
- Releases the starter circuit, so the car will turn over/crank
- Talks to the DME to tell it that fuel pump, spark and fuel injection can be turned on (drive away protection)

The EWS is a hard part to remove. There is special coding needed for the DME to enable the car to start. We don't talk about this part very much on public forums as crim's can pick up on it and learn how to steal our cars.

 

[johnc46]

Hi, much appreciate the information, I think it's best left alone.

 

[Andyboy]

All Z3's had EWSII as standard as it was fitted to all BMW's from January 1995. If a BMW of this era had the brick type separate remote then it's a dealer fit alarm that can easily be removed. There are various alarm types, 2T and 3T are Sigma alarms and there is the 3G (or IIIG) system. These alarms are independent of EWS and don't affect it. They are removed by finding the control unit behind the glovebox, in with the other modules (EWSII, general body module, wash wipe module). Then follow each wire to where it's been spliced into the car loom. BMW alarms used plugs so you just unplug two alarm wires and reconnect two originals. I always try and start the car after each wire has been disconnected. Generally you have motion sensors in the A post trims, a bonnet sensor switch, wires plugging into the body control module wires that go to the interior light switches, one to the fuel pump, one to the ignition switch as well as the hazard light switch.
It's really not a big deal. I've removed seven or eight of these.

What alarm does it have? The factory fit system has the big key with three buttons that locks/unlocks the car. Some (but not many) had a separate immobiliser demanded by insurance companies. If you can put up a photo of the key and alarm fob it'd be useful. You can remove the glovebox in 10 mins, find the alarm control unit and get the numbers from it also.

 

[johnc46]

Thanks for taking the trouble to reply much appreciated. Here they are

 

[Jim Aldridge]

I appear to have the same system with the same fob. I have never pressed the buttons as I didn’t know if it would cause problems! I did find the alarm mounted in the engine bay on the near side and it appears to have an off and on key switch on it. Mine is a 1997.
I did have in one of the blanks in the centre console, a red light that I assumed was part of the alarm, but found out when removing that it could be pressed and then the light started flashing quickly. So I pressed it again and it stopped. I’m assuming they are connected but I don’t have any handbooks with the car!

 

[jonco]

......I did have in one of the blanks in the centre console, a red light that I assumed was part of the alarm, but found out when removing that it could be pressed and then the light started flashing quickly. So I pressed it again and it stopped. I’m assuming they are connected but I don’t have any handbooks with the car!

These pages are extracts from supplementary manual - the red LED incorporates a `push pulse button` which overrides internal sensors - it's all in the text. HTH

 

[Jim Aldridge]

Thank you for your response!!

 

[johnc46]

Thanks it's a good guide for me also

 

[Andyboy]

Thanks for taking the trouble to reply much appreciated. Here they are

So that's the factory remote central locking system and a 3G alarm. Does the fob do anything? Does the car lock/unlock on the key buttons? If the key works OK, the 3G thing can be removed.

 

[Andyboy]

E36 2G and 3G digital system wiring diagram. There are two choices for wires into the engine ECU (Motronic), pin 81 or 38....it's 81 on an E36 with Motronic 1.7 (M42) but the M44 is 5.2. My BMW alarm manual is from late 1995 so doesn't cover the Z3 or M44 specifically but this gives you an idea. You'd see a wire coming from the alarm box going up into the ECU box but I've a feeling the 3G EWS doesn't have this wire.

 

[jonco]

.........but the M44 is 5.2. My BMW alarm manual is from late 1995 so doesn't cover the Z3 or M44 specifically but this gives you an idea. You'd see a wire coming from the alarm box going up into the ECU box but I've a feeling the 3G EWS doesn't have this wire.

@Andyboy - I'm crap at wiring diagrams but attached pics are from an M44 - 12/97 build but alarm install 04/98 - may help you work it out. On the second pic to the left is a multi-pin plug in. HTH.

 

[jonco]

Thanks it's a good guide for me also

There are some pics in this which may help. There was a changeover in this period so similar production dates may have different EWS versions which were dealer installed as previously stated.

3G EWS remote fob programming

Subject: 3G EWS remote fob programming Background I have a ’98 1.9 Z3 with the old style `house-brick’ remote and had problems with it not operating. I sought help on the zroadster forums and as is usual, there were lots of useful comments and...

zroadster.org

 

[johnc46]

I have only just bought the car, key had no battery now replaced but probably needs resync, although central locking works with key in door lock, not tried the fob as battery is disconnected due to a few jobs being done, this a work in progress not urgent but the information is very welcome.