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Will this work to bypass the chip keys?

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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Will this work to bypass the chip keys?

Post by wrybread » Mon May 20, 2019 6:06 pm

I was just quoted $425 for each spare key for my s70... After being locked out in the rain for an hour yesterday I almost considered it, but that's just completely absurd.

As it was explained to me there's a chip in each key, and the car needs to be programmed to accept each of those unique chips. But they also said I could get basic chipless keys cheaply...

So can I just stash my one chip key somewhere in the car, and use the generic keys? Any downside other than making my car slightly more stealable?

And any suggestion on where to stash it? I was thinking behind the dash near the ignition.

And speaking of getting locked out of my car, is there some way to disable that ridiculous auto lock feature?



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Re: Will this work to bypass the chip keys?

Post by abscate » Mon May 20, 2019 6:19 pm

I had auto lock turned off all my cars - hate it.

I run my S70 with a single chipped key, but it has to be in the right position relative to the antenna (on the key hole) - as in within a cm, to work,

It can't be in the glove box.

I taped into a spare antenna I had lying around under the dash, and plugged that one into he harness.


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Re: Will this work to bypass the chip keys?

Post by wrybread » Mon May 20, 2019 6:50 pm

Oof on the cm range. Can you explain the antenna a bit more? And how you connected it to the harness? I don't know anything about how the chip key works.



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Re: Will this work to bypass the chip keys?

Post by abscate » Mon May 20, 2019 7:29 pm

I plugged a second antenna into the harness and taped a key into that antenna

Part 9442961 about 45 bucks new

Scavenge from junkyard fir $5
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Re: Will this work to bypass the chip keys?

Post by DeadEric » Mon May 20, 2019 9:30 pm

I've seen quite a few cars with hide-a-key boxes somewhere on them at the shop. I guess that's an option for a nonchipped key.

One guy had a key zip tied to fuel line, the key was so rusty I doubt it still worked. Another put it on his exhaust and everything was melted together. You could see the outline of the key but I'm not sure you could get it out. So don't do those things.

I don't have chips in my keys, I don't know the specifics on how they everything works. I'm not sure if the chip being read and the key being turned in the ignition, shuts off the alarm or how that effects your decision.

I do know, on my car, if I lock the doors with the windows down, use the inside lock to unlock the door, and open it with the outside door handle, the alarm goes off... You then panic a bit and drop the too much stuff you had in your hands too fish the key out, you know, so you can fish the key out. Stick the key in the ignition, turn it hoping the alarm turns off and nothing happens. Yell at your buddy (who looked the doors to be funny) that the fob is on the wife's key ring and you can't just hit the button. Panic a bit more... Then you remember someone posting "to turn off the alarm, unlock the door 3 times with the key" and that finally works.

Thanks who ever posted that.
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Re: Will this work to bypass the chip keys?

Post by wrybread » Mon May 20, 2019 9:56 pm

Ha. Been there done that panicking to turn off the damn alarm. I live part time in the city (San Francisco) where alarms are at best ignored and at worst pelted by eggs, so for that and other reasons I keep meaning to at a minimum disconnect the siren. But with the way things have been going today I'm worried that's going to disable the whole car or cost me $900.



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Re: Will this work to bypass the chip keys?

Post by wrybread » Mon May 20, 2019 10:03 pm

Has anyone extracted the chip in the S70 key (or similar) like this guy has?



Seems like a good idea, unless there's a battery and active circuitry in there.



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Re: Will this work to bypass the chip keys?

Post by jimmy57 » Mon May 20, 2019 10:53 pm

The metal cut keys with chips use the same chip that gets placed in your dog. It is literally the size of a grain of rice. The antenna gets pulsed with current to make magnetic pulses and the pulses are picked up by a winding of wire in the chip and power the chip to broadcast a radio signal. The pattern of the pulses is random so the chip must send back radio signal in the matching pulsed pattern. There is no battery for the immobilizer feature of the key. If the chip is extracted from plastic key head and is in the right proximity to the antenna ring then it would do its job.
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Re: Will this work to bypass the chip keys?

Post by RickHaleParker » Tue May 21, 2019 8:41 am

If I am interpreting the 2000 S70 EWD Early edition correctly, these cars do not have start inhibitor. They have a starter inhibitor that works by opening the ground to the starter relay. If this is all there is to it, one could run a wire from pin #2 (Solid Black) of the starter relay to ground and then any key that can turn the ignition switch will work.

An alternative to grounding pin #2 of the starter relay would be to jumper pins A:1 to B:21 on the Central-locking/anti-theft-alarm control unit, both of the wires are Solid Black.

The ECM is in the starter inhibitor circuit but no indication that the ECM is inhibiting the fuel injectors or the ignition. This is the uncertainty for this theory.

Abscate you got a couple of '99s, care to test this theory?
Last edited by RickHaleParker on Tue May 21, 2019 8:57 am, edited 1 time in total.
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Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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Re: Will this work to bypass the chip keys?

Post by abscate » Tue May 21, 2019 8:55 am

RickHaleParker wrote:
Tue May 21, 2019 8:41 am
If I am interpreting the 2000 S70 EWD Early edition correctly, these cars do not have start inhibitor. They have a starter inhibitor that works by opening the ground to the starter relay. If this is all there is to it, one could run a wire from pin #2 (Solid Black) of the starter relay to ground and then any key that can turn the ignition switch will work.

The ECM is in the starter inhibitor circuit but no indication that the ECM is inhibiting the fuel injectors or the ignition. This is the uncertainty for this theory.

Abscate you got a couple of '99s, care to test this theory?
Both my 1999s start inhibit like this.


First crank - engine catches and starts, runs for about one second, then stalls.

Subsequent cranks work and turn the engine over, but the engine will not fire. I don't know if its fuel or spark or both


From 2017
Outstanding Counselor.

I had two keys made for my 1999, and they messed the first two up. Now I have three keys that work and two keys that open doors and trunk only.

Observation on immobiliser faults with 1999 ME7

The first ignition try the engine catches, runs one second and stops. Subsequent key turns give cranking only, no ignition ( I believe it's spark that is inhibited )

You don't get the run-halt behavior again until you start the car with a good key. Whatever flag is set in the ECU sticks until a good key sequence start is successful


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