The early Z3 did not have an alarm as default from the factory. The early Z3 had an alarm fitted as a dealer option. My Z3 came with the EWS IIIG alarm. The IIIG alarm has a separate fob to control the alarm remotely. The alarm cannot be set by locking the car from the car doors. At some point in the past, the fob for the car was either lost or broken and no longer available to me. I can see that the alarm still seems to be active as it flashes when I stop the car and take out the key. It only flashes once and does not seem to be alarmed.
After months of searching around forums and eBay, someone posted a link to an eBay seller that had some IIIG fobs for sale. I quickly jumped on this and bought one.
My Z3 has a strange central locking issue that I need to look in to. When I use the key in either the passenger or drivers door it will operate the central locking for the doors. The boot does not lock or unlock if the key is used from the doors. If I use the key in the boot lid to unlock / lock the boot it also operates the doors. So, if I use the key in the door to unlock the door, both doors unlock but not the boot. If I lock the door from the door, both doors lock but not the boot. If I unlock the boot using the key in the boot, the boot will unlock and both doors will unlock. If I lock the boot from the boot lock, the boot will lock and both doors will lock. So, if I unlock the car from the boot and then lock the car from the doors, the boot will not be locked.
It appears that the signal from the central locking from the doors is not making it to the boot actuator. There is a known issue on the Z3 where the wiring loom that goes from the boot in to the car can sometimes contain broken cables. It could be that there is a broken cable in the loom. You can see examples of broken wires in the photos below (courtesy of @jonco on zroadster.org). Detailed below are the indvidual wires and there function.
As soon as lock down allows I will be out to the car to break open the wiring loom to see if any of my wires are broken and causing my issue. I will update the post with what I find.
I have documented here the details of what each wire is used for is noted below (courtesy of @jonco and @BrianH on zroadster.org)
There are 9 wires in the boot loom. The lock/unlock and switch position functions are controlled via the central ZKE module The two wires below are part of a common loom that triggers the door actuator/lock.
1.5 BL/GR blue/grey – boot lock motor wire
1.5 WS white – boot lock motor wire
The three wires below are supply wires and lock position wires, the supply is fed from fuse 7 (5amp)
UPDATE: I finally got around to opening up the loom and found that I had a blue wire that was broken. I stripped back the wire and soldered it back together and now the central locking works exactly as it is supposed to.