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850 immobilizer fun

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Re: 850 immobilizer fun

Post by summakor » Wed Jun 08, 2016 10:08 pm

For the V70, the ECU is linked to the immobilizer under the steering column, which in turn is programmed to recognize the proper chipped keys. Maybe replacing all three with a set (ECU, immobilizer, key) could work. Some locksmiths will program the transponder if you take it to them (easy), for example something like LostVolvoKeys.com will do it by mail. It's not cheap but better than towing the car to the dealership.

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Re: 850 immobilizer fun

Post by misha » Thu Jun 09, 2016 5:40 pm

They are linked,but ONLY in the way that immo sends ok signal to ecu...nothing else...on pre '99 models.So you would only need immo ecu and it's key.Ecu just needs "green light" from immo ecu.
'99 model car's immo system is linked with ecu in different way.In this case you would need ecu,immo ecu and it's key(chipped key) because there is confirmation code which ecu is requesting from immo ecu.

On pre '99 models it's so much simpler.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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