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Mounting start button on old S70?

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
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Mounting start button on old S70?

Post by baxtex » Sun Sep 15, 2019 11:56 am

So I recently swapped my lock cylinder to one I got at the scrap. I taped my old key behind the antenna so I didn't have to program my "new" keys. Now I'm thinking, would it be possible to hook up a start button in case my new key starts having problem starting the car. Do anyone have a schematic of the cables that are connected to the ignition lock? I'm guessing I would have to hook into these and connect them to a start button.



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Re: Mounting start button on old S70?

Post by abscate » Sun Sep 15, 2019 12:30 pm

On a 1999, the ECM will not like having the key in constant proximity to the antenna, and might give a code for this. Its a non CEL code, so you won't see it, but you might get a start stall cycle, followed by a successful start and run cycle after that. There is no other reason to think you new key and lock cylinder won't work, all the other electrical part of this circuit is identical. It is possible two keys close to the antenna might also confuse it, though. I mounted my antenna rings under the dash for that reason(I had a spare one)
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Re: Mounting start button on old S70?

Post by baxtex » Sun Sep 15, 2019 12:51 pm

abscate wrote:
Sun Sep 15, 2019 12:30 pm
On a 1999, the ECM will not like having the key in constant proximity to the antenna, and might give a code for this. Its a non CEL code, so you won't see it, but you might get a start stall cycle, followed by a successful start and run cycle after that. There is no other reason to think you new key and lock cylinder won't work, all the other electrical part of this circuit is identical. It is possible two keys close to the antenna might also confuse it, though. I mounted my antenna rings under the dash for that reason(I had a spare one)
Oh really? I didn't know that...then I might do what you did, tuck the antenna ring away and tape the old key there.



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Re: Mounting start button on old S70?

Post by abscate » Sun Sep 15, 2019 1:10 pm

I have another problem in my S70, the immobilizer never sleeps, so my antenna ring is always illuminated. That might be the cause of my IMMOB fault and start/fail cycle, and Im pretty confident of that.

In my car, its start, stall. Count to three, start again, and drive away.


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Re: Mounting start button on old S70?

Post by baxtex » Mon Sep 16, 2019 1:24 am

abscate wrote:
Sun Sep 15, 2019 1:10 pm
I have another problem in my S70, the immobilizer never sleeps, so my antenna ring is always illuminated. That might be the cause of my IMMOB fault and start/fail cycle, and Im pretty confident of that.

In my car, its start, stall. Count to three, start again, and drive away.
Sounds odd but yeah, it's not unreasonable to think that it is causing your issues...

If you remove your key, the antenna ring turns off? Do you still have this cold start issue then? I am thinking if removing it somehow clears this code you are talking about.



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Re: Mounting start button on old S70?

Post by scot850 » Mon Sep 16, 2019 9:13 am

I have a key mounted up inside the dash area as you need that to by-pass the ignition to allow remote start to work.

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Re: Mounting start button on old S70?

Post by baxtex » Mon Sep 16, 2019 10:26 am

scot850 wrote:
Mon Sep 16, 2019 9:13 am
I have a key mounted up inside the dash area as you need that to by-pass the ignition to allow remote start to work.

Neil.
It's not enough to have it on the same keyring as the new key?



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Re: Mounting start button on old S70?

Post by abscate » Mon Sep 16, 2019 10:06 pm

No, and more than one key on a ring can also confuse the immobilizer


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Re: Mounting start button on old S70?

Post by baxtex » Tue Sep 17, 2019 2:55 am

abscate wrote:
Mon Sep 16, 2019 10:06 pm
No, and more than one key on a ring can also confuse the immobilizer
Ok, then I will just put it inside the antenna ring like the rest of you guy and move it away from the actual cylinder so my new key doesn't interfere.



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