XJ XJ6 / XJR6 ( X300 ) 1995-1997

immobilizer or synros problem XJ SIX 4.0 V6 240CV BVA from 1995

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Old Aug 16, 2025 | 02:47 PM
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From: havre
Default immobilizer or synros problem XJ SIX 4.0 V6 240CV BVA from 1995

Good evening and thank you for your welcome I am looking for help or information to start Daimler XJ SIX 4.0 V6 240CV BVA immobilizer problem with alarm synchronized and therefore unlocked following a total loss of key the vehicle was bought like that neiman and key changed but impossible to learn the keys via the obd socket. Because I have no diagnostic tool that connects to this vehicle, so I made 2 new keys and programmed with the module but I still have no starter launch so immobilizer active while the transponders are ok the alarm deactivated via the remote control, I have the impression that it is the alarm which blocks the start, I have the original remote control of the vehicle the frequency is good it emits a signal so dry and goes in circles with this car. Who could help me if you know this system because I don't know this system or is there a diagnostic tool with which I could connect to interrogate the system and see what is blocking me since now I have the keys that are programmed but still no cranking of the starter Thank you
Thank you for your help and sorry for my poorly translated English.
 
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Old Aug 17, 2025 | 12:59 AM
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Oops.

Your XJ6 is known as an X300. Confusing, yes, but you get used to it.

The X300 Members will have the answers you seek.

Good luck.
 
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Old Aug 29, 2025 | 12:51 AM
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From: havre
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Hello
I hope you're all well? I'm still looking for information on how to get this vehicle running. Can anyone give me a little help, please?
I'm looking for an old manufacturer's diagnostic tool so I can run my diagnostics and see if I can use the OBD port to learn the keys or find out what's blocking it. Thank you for your help and have a nice day.
 
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Old Aug 29, 2025 | 12:58 AM
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Who could give me the location of the injection computer so I can check that it has no problems! Thank you
 
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Old Aug 29, 2025 | 03:26 AM
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X300 Jaguars outside the USA have a transponder chip in the key.
The keys must be matched to the Security and Locking Control Module (SLCM) using dealer level software.
If the key is not recognised by the SLCM fuel injection is inhibited by the Engine Control Unit (ECU).
The ECU is located behind the trim panel in the right hand footwell.
 
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Old Aug 30, 2025 | 10:57 AM
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Editing

The chip in key exciter / transponder / decoder does have a fuse and a tricky down the system wiring connector that can be mis connected

There is a BPM and SLCM hard reset that brings them to zero state that does not effect the engine ECU , but does lock out the original Jaguar / Alpine stereo head ( theft protection )

The Body Processor Module is the summation point of your starter enables , the BPM then provides a ground to close the starter solenoid relay

The 2 fuses are # 3 left engine bay fuse box and the group of 4 in the right engine bay fuse box ( # 10 , 12 , 14 , 16 )

The starter solenoid relay is one of 10 - 16 and one of them is the first power to the engine ECU ( must be powered to provide an enable to the BPM so it can provide the ground to close the starter solenoid relay

fuse # 10 , 12 , 14 , 16 must have the small relay in the corner of the fuse box close , there is a simple test and relay swapping option

Andy in England can negate the immobilizer as is a common issue

To get the car running you can jumper between socket 3 to 5 of the starter solenoid relay socket with a medium gauge jumper wire

The chip in key decoder does not show in this picture as in chapter 16 picture

the decoder definitely feeds the SLCU ( chapter 16 ) but is the Engine ECU that handles the enable to the BPM so not straight fwd

Your 1995 should have a 315 hz FOB and most likely the correct 315 antenna on the rear glass

The fuse in the trunk for the security system may have been pulled during storage to keep alarm silent after battery drain down

The location of the SLCU is fwd of the left trunk hinge and the 4 connecters can be installed incorrectly ( positive battery must be removed ) and some water can get into them from the fuel fill well having the drain line clogged ( you will see the stainer black piece and it wiggles out to remove






 

Last edited by Parker 7; Aug 30, 2025 at 11:24 AM.
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