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Old 2nd October 2021, 11:20   #1
Rickshaw
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Rover 75 Tourer, 2 X75 Saloon , MGTF Sunstorm

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Question What's with the key

My Tourer passed MOT about a month ago and shortly after refused to start. Jump start from another car failed . RAC diagnosed faulty / dead battery - was from 2014 so lasted well. Installed a new battery , all lights , horn , radio etc work BUT starter motor would not work - not any sound at all. At this point I began to think of possible causes eg
• failed ignition switch – but most devices working
• a fuse – have yet to check this but now not likely ( see below)
I then thought outside the box and wondered whether my ‘key’ status was to blame. You see , the fob fell apart a short while ago ( as they do ). I have some spare fob shells and moved all the electronics across into a new one BUT simply could not free up the metal key shaft. Solution – I left the metal shaft in the dead old shell and kept the electronics in the new shell with both on the same key ring. New fob electronics work eg open car, lock etc and old metal shaft will unlock drivers door. In either case all devices , horn , radio, lights work. BUT nothing from starter motor. At this point I decided to try my spare key - it worked !! So it would seem both metal shaft and electronics have to be housed in same shell – but I am not aware of any electrical connection to the shaft and cannot understand why the shaft alone cannot start the car even when fob has opened car? Can anyone explain this to me ? Observations welcome.
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Old 2nd October 2021, 11:26   #2
SD1too
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Hello Roger,

Does the key case with the blade still have the transponder fitted? It's a little black box sitting comfortably in the corner of the casing. This needs to be very close to the barrel in order to communicate with the immobiliser (which disables the starter motor).

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Old 2nd October 2021, 11:29   #3
Arctic
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This thread should give you all the answers you need.

https://the75andztclub.co.uk/forum/s...d.php?t=155068
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Old 2nd October 2021, 11:32   #4
vitesse
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And where's the transponder chip? It has to be within 2cm of the black ring aerial.

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Old 2nd October 2021, 11:47   #5
Rickshaw
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Smile Quick update

It may be the proximity of the transponder - good idea. It is , of course , in the fob shell.
Follow up note :-
Yep , that was it !! The 2cm pointer was spot on. Held the fob right up against the metal key shaft / ignition and car started, Repeated 4 times. Thanks to all members above. This club is SO useful with really helpful members. Big thanks to all

Last edited by Rickshaw; 2nd October 2021 at 12:02.. Reason: update to show problem solved thanks to club members
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