XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

No central locking, No cranking, No start. Security Moduale,

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Old Jun 6, 2025 | 08:47 AM
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Default No central locking, No cranking, No start. Security Moduale,

Greetings.
1996 XJS Celebration coupe, 4.0L, Auto, UK spec.
I managed to flatten the battery, put on charge but now it won't start. All the dash lights come on but it will not crank over. I have changed the battery in the remote. Car battery is less than 12 months old. Prior to this the central locking was behaving erratically. I suspect the Security module is the issue. for my car it has the part number DPP 1051/01 and Body number 7K006694. I am struggling to find a replacement unit. What are my options ? Alternatives ? I notice that one of the connectors in the loom has a wire bridging two contacts. And another contact has been taped up. Looks like someone has been here before. An help gratefully received.
I am in Blackpool UK.


Looks like someone has been here before !
Looks like someone has been here before !
Red insulating tape Grn/Yel Blo/Gry
Red insulating tape Grn/Yel Blo/Gry
This is the connector with the red wire bridging two terminals.
This is the connector with the red wire bridging two terminals.
Opposite side of bridged connector.
Opposite side of bridged connector.
 
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Old Jun 10, 2025 | 03:57 AM
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AVRO XJS,

Before you think about changing items, maybe start with the basics:

- What is the battery voltage (measure it at both the battery terminals AND ALSO at the bulkhead terminals. Is it above 12.4v and within 0.1v at the bulkhead?
- Is there any noise eg a click, when you try and turn it over or no change at all from being in ign Pos II?
- Does the car lock and unlock with the remote now that the battery is charged?
- Do you have the additional fob-key operated immboliser fitted to the car at the ignition switch?

Paul
 
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Old Jun 23, 2025 | 05:16 AM
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Thanks PJs1sound advice. Don't panic check the basics !
I had the car on trickle charge whilst on holiday. Came back and checked all the basics. Turned out that one remote was dead. The spare did not work even with a new battery, until I cleaned the coroded battery contacts ! all good now huge sigh of relief. Thanks for your input.
Regards Tig
 
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