Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

Volvo s70 '99 - Immobiliser stops engine after starting

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Old 07-20-2015, 04:12 AM
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Default Volvo s70 '99 - Immobiliser stops engine after starting

Hey all,

When I start the car about 2 seconds later it turns of - but its not a sudden stall its a wind down so I am 99% sure its the immobiliser. Further to this, it doesn't start again after the first try - I have to wait 5 minutes to start it again (or dis/reconnect the battery). I read in the manual that this is the immobiliser.

I have tried both keys, and neither one works - which makes me think its probably not an issue with the ring antenna although I checked that anyway and it looks ok (no frayed wires or contacts).

Prior to this happening, I had the battery out for 1.5 days - could having the battery out reset the code in the immobiliser? Do I have to somehow reprogram the immobiliser? Is there anyway to bypass or remove it all together?

Thanks. My engine seems to be working fine now, but since I removed the battery the immobiliser is causing me grief. Thanks in advance.
 
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Old 07-20-2015, 05:16 AM
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If this happens with either let, that would mean the problem isn't the key and is more likely the antenna ring. I would try a new antenna ring since you don't need to program it.
 
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Old 07-20-2015, 05:47 AM
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Thanks, yeah most of what I have read indicates new antenna ring, although it looks so new - perhaps is shorted out when I plugged in the battery?

If I get a new antenna ring, how does the immobiliser know not to activate? Wouldn't I have to program that as well? Just curious thanks.
 
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Old 07-20-2015, 09:25 AM
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The antenna ring simply reads the key and communicates that info to the immobilizer.
 
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