key fob passive reader on ignition barrel

hi, can anybody tell me if the passive reader on the ignition barel is coded to the key fob, mine has been disconnected, everything works ok but if the battery goes flat i have to resync the keyfob using the key in doorlock and pressing the buttons method, would be much easier if i could just put key into ignition and the system sorts itself out. the car is 1996 4.6 hse

It would be interesting to know for sure, my guess is that it is not. I think all it does is induce the FOB to transmit which is picked up by the RF receiver.
I could be way off on this one though.

The exciter ring, around the ignition, isn't coded. It would pick up on any fob.

However, depending on what software level your vehicle is working on depends if this feature is fitted.

The key fob is only programmed to the becm, so the RF receiver would also pick up on any fob.

thanks for the input, is the feature something i could enable using t4 or rovacom?,

steveshone said:

thanks for the input, is the feature something i could enable using t4 or rovacom?,

Click to expand...

I'm not sure that the 96 had that feature? Thought it came in in 99. Could be wrong on that though. If the car is working without it, I would think that is the way it's meant to be and perhaps the lock has been changed at some time???

steveshone said:

hi, can anybody tell me if the passive reader on the ignition barel is coded to the key fob, mine has been disconnected, everything works ok but if the battery goes flat i have to resync the keyfob using the key in doorlock and pressing the buttons method, would be much easier if i could just put key into ignition and the system sorts itself out. the car is 1996 4.6 hse

Click to expand...

Why not sort out your battery problem if it goes flat all the time?

The barrel feature wasn't there in 1996 as data says, also says in RAVE... 99 onw... Actually 97MY see correction further down

the battery issue was caused by the nearside rear airbag leaking, i don't use the car on a day to day basis and as it was slowly leaking the eas would be trying to compensate for the drop until the battery went flat, thats now sorted with a set of arnott bags fitted, which i must say have transformed the ride, i have also reconnected the snipped wire on the exciter module and it now resync's the key when i put it into the ignition, still baffled though as to why the previous owner had disconnected itand moreso that he snipped the wire rather than unplugging it?

steveshone said:

the battery issue was caused by the nearside rear airbag leaking, i don't use the car on a day to day basis and as it was slowly leaking the eas would be trying to compensate for the drop until the battery went flat, thats now sorted with a set of arnott bags fitted, which i must say have transformed the ride, i have also reconnected the snipped wire on the exciter module and it now resync's the key when i put it into the ignition, still baffled though as to why the previous owner had disconnected itand moreso that he snipped the wire rather than unplugging it?

Click to expand...

Even more odd is the fact that the feature did not apparantly exist on a 96 model
The EAS will not cause the battery to go flat even if it drops the the stops, it only wakes up every 6 hours to re-level

Druim said:

Why not sort out your battery problem if it goes flat all the time?

The barrel feature wasn't there in 1996 as data says, also says in RAVE... 99 onw...

Click to expand...

Correction: See underneath from RAVE

Resynchronisation
On vehicles up to 97MY, resynchronisation is
achieved by locking or unlocking the driver’s door
using the vehicle key with 30 seconds of locking,
superlocking or unlocking using the remote handset.
The BeCM monitors the condition of the driver’s door
CDL switch to initiate the resynchronisation.
On vehicles from 97MY, friendly resynchronisation
was introduced on vehicles with passive
immobilisation. A remote handset that is not
synchronised to the BeCM will automatically be
resynchronised when the key is inserted in the ignition
without using the vehicle key or Emergency Key
Access (EKA) procedure.
The resynchronisation uses a pick-up coil in the
remote handset and a passive coil located around the
ignition barrel. The passive coil provides a signal for
the remote handset to transmit an unlock signal to
remobilise the vehicle

Firstly apologies if this is in the wrong section, I posted on here a few years ago regarding my 96 p38 4.6, having bought the car 10 years ago and doing only 1 mile in it after which for most of the time it has sat locked away in my garage, I decided to remove the v8 which was an unknown quantity and I have converted it to diesel bmw 2.5 M51. I purchased the engine complete with all ancillaries and loom, bell housing, coolant and oil cooler radiators, 2.5 torque converter,
I had to change my HP24 auto box front end for a HP22 front end which has a shorter stator and turbine shaft to accommodate the 2.5 converter and also change the transmission controller ecu under the passenger seat
I had to change the transmission cooler pipes to 2.5 cut them and fit hard line connectors so that I can re route the transmission cooler and still keep my fog lights.
air con was a case of swapping pipes for the 2.5 version and re routing the compressor clutch wire
rather than having to mess about with trying to sync and match emu's I bought a matched set, BECM, ECM, instruments, drivers door lock glove box lock, 2 keys/fobs then just a case of swapping them over.
the engine came complete with its wiring loom but I had to change the under bonnet fuse box , the diesel loom comes with a round black plug and I had to splice in the corresponding socket the loom beneath the coolant header tank tracing each with with the help of workshop manual wiring diagrams,
I had to replace the pedal box with a diesel pedal box as it has the throttle pedal sensor a lot of work for the difference of a 5cm hole and two captive nuts
coolant plumbing is a straight swap for diesel coolant pipes
I have used the petrol feed and return pipes which are original and factory clipped to the chassis and joined to them with the diesel feed and return plastic pipes across the bulkhead the joins being next to the brake fluid reservoir, I replaced the petrol in tank pups for the diesel type and replaced the fuel filler pipe to accommodate the diesel filler pump nozzles.
stainless steel exhaust but I had to shorten the middle box forward pipe and reeled the flange in place and then cut off and fabricate a two bolt flange onto the 2.5 down pipe

car is back together now starts first time and sounds really well but I have a couple of issues which I would appreciate any input on,
firstly I have an issue with the under bonnet SRS fuse which keeps blowing fuse 23, but having disconnected the feed wire from the fuse box C173 pin 4 to the drivers side heated screen and leaving it unplugged fuse 23 remains intact, looking at the wiring diagram fuse 23 supplies only SRS and instrument cluster, I am thinking perhaps a fuse box internal short and will be checking for any continuity between pin 4 and fuse 23 I have already tried another relay as a process of elimination

my other issue is central locking, the car locks and unlocks using the drivers door lock with no issues, but not with the fob, I have tried the resync with key in door lock at per the handbook and also tried it in the ignition to no avail,
I have looked at BECM with Nanocom and cleared RF Memory I then went through resync procedurerescanned and have the following message:THE BECM HAS RECEIVED A VALID RADIO CODE
when I look at one of the BECM settings pages I see IMMOBILISATION CODE and a box with 4 numbers, below that EKA and a box with4 dashes and no numbers, below that FOB CODE and 3 boxes each with 3 dashes each but no numbers,
is it that the fob codes are not written ti the BECM and therefor not working, if so where can I get the fob codes, as stated above I purchased the BECM etc at a matched set.

Best regards
Steve

Datatek said:

I'm not sure that the 96 had that feature? Thought it came in in 99. Could be wrong on that though. If the car is working without it, I would think that is the way it's meant to be and perhaps the lock has been changed at some time???

Click to expand...

I didn't think it came in until later on although not sure if '97 or '99.

Edit. Just read Druim's post. 97 it is.

steveshone said:

Firstly apologies if this is in the wrong section, I posted on here a few years ago regarding my 96 p38 4.6, having bought the car 10 years ago and doing only 1 mile in it after which for most of the time it has sat locked away in my garage, I decided to remove the v8 which was an unknown quantity and I have converted it to diesel bmw 2.5 M51. I purchased the engine complete with all ancillaries and loom, bell housing, coolant and oil cooler radiators, 2.5 torque converter,
I had to change my HP24 auto box front end for a HP22 front end which has a shorter stator and turbine shaft to accommodate the 2.5 converter and also change the transmission controller ecu under the passenger seat
I had to change the transmission cooler pipes to 2.5 cut them and fit hard line connectors so that I can re route the transmission cooler and still keep my fog lights.
air con was a case of swapping pipes for the 2.5 version and re routing the compressor clutch wire
rather than having to mess about with trying to sync and match emu's I bought a matched set, BECM, ECM, instruments, drivers door lock glove box lock, 2 keys/fobs then just a case of swapping them over.
the engine came complete with its wiring loom but I had to change the under bonnet fuse box , the diesel loom comes with a round black plug and I had to splice in the corresponding socket the loom beneath the coolant header tank tracing each with with the help of workshop manual wiring diagrams,
I had to replace the pedal box with a diesel pedal box as it has the throttle pedal sensor a lot of work for the difference of a 5cm hole and two captive nuts
coolant plumbing is a straight swap for diesel coolant pipes
I have used the petrol feed and return pipes which are original and factory clipped to the chassis and joined to them with the diesel feed and return plastic pipes across the bulkhead the joins being next to the brake fluid reservoir, I replaced the petrol in tank pups for the diesel type and replaced the fuel filler pipe to accommodate the diesel filler pump nozzles.
stainless steel exhaust but I had to shorten the middle box forward pipe and reeled the flange in place and then cut off and fabricate a two bolt flange onto the 2.5 down pipe

car is back together now starts first time and sounds really well but I have a couple of issues which I would appreciate any input on,
firstly I have an issue with the under bonnet SRS fuse which keeps blowing fuse 23, but having disconnected the feed wire from the fuse box C173 pin 4 to the drivers side heated screen and leaving it unplugged fuse 23 remains intact, looking at the wiring diagram fuse 23 supplies only SRS and instrument cluster, I am thinking perhaps a fuse box internal short and will be checking for any continuity between pin 4 and fuse 23 I have already tried another relay as a process of elimination

my other issue is central locking, the car locks and unlocks using the drivers door lock with no issues, but not with the fob, I have tried the resync with key in door lock at per the handbook and also tried it in the ignition to no avail,
I have looked at BECM with Nanocom and cleared RF Memory I then went through resync procedurerescanned and have the following message:THE BECM HAS RECEIVED A VALID RADIO CODE
when I look at one of the BECM settings pages I see IMMOBILISATION CODE and a box with 4 numbers, below that EKA and a box with4 dashes and no numbers, below that FOB CODE and 3 boxes each with 3 dashes each but no numbers,
is it that the fob codes are not written ti the BECM and therefor not working, if so where can I get the fob codes, as stated above I purchased the BECM etc at a matched set.

Best regards
Steve

Click to expand...

Duplicate post?

... and a duplicate answer!

You said you got all replacement locks and fobs as well. It is just possible that your old system was 433 MHz and the replacement fobs 315 MHz or vice versa. If that is the case then the receiver won't "see" the key as it is in the wrong band. We have trouble here with the same issue. I bought a replacement key off of LR for my truck, it wouldn't work. Seems LR supplied a 433MHz key for my 315MHz vehicle. Refund thanks!

So as a way forward, give Les at Classic Rides North Wales a call, he is very helpful and can give you pointers as to which frequency range your receiver is in. Take a photo of it before you call him.