Working out resistor values

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naughtydog

Copper - Posts: 90

Joined: May 02, 2002

Location: United Kingdom

Posted: May 02, 2002 at 4:45 PM / IP Logged

Can anybody explain how to work out the resistor value when working with "single wire central door locking". In the UK, the new VW polo for example has single wire negative pulse cdl and requires a resistor to unlock. How is the required value of resistor arrived at??

Is it a matter of trying various resistors until it works???

There must be some method and can it be done with a normal multimeter...

Regards

Naughtydog

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: May 02, 2002 at 5:05 PM / IP Logged

Hi Naughtydog, yes, use your meter to measure resistance to ground during unlock on the lock/unlock lead to determine the value of the needed resistor .

the12volt

naughtydog

Copper - Posts: 90

Joined: May 02, 2002

Location: United Kingdom

Posted: May 03, 2002 at 1:32 AM / IP Logged

Ok,

I set my meter to the resitsance scale. I place the positive lead on my vehicle wire and the negative lead to ground. When I operate the locking, i should get a reading. Does that sound right

Naughtdog

naughtydog

Copper - Posts: 90

Joined: May 02, 2002

Location: United Kingdom

Posted: May 03, 2002 at 5:25 AM / IP Logged

Just a thought...Must this procedure be carried out with the vehicle battery disconnected to obtain the corrrect value required???

naughtydog

Big Dog

Gold - Posts: 1,265

This member consistently provides reliable information

Joined: May 02, 2002

Location: Quebec, Canada

Posted: May 03, 2002 at 7:13 AM / IP Logged

Just to add to the comments, this procedure explained before is correct:

Hi Naughtydog, yes, use your meter to measure resistance to ground during unlock on the lock/unlock lead to determine the value of the needed resistor .

the12volt

However, do your reading while turning the key in the drivers door cylinder.

Prepare your future. It wasn't the lack of stones that killed the stone age.

Big Dog

Gold - Posts: 1,265

Joined: May 02, 2002

Location: Quebec, Canada

Posted: May 03, 2002 at 7:22 AM / IP Logged

Hey Naughtydog, is there a particular car that you're working on? Is it a Chrysler or a Mazda? This info can help us give you more exact info! Working out resistor values -- posted image.

Working out resistor values -- posted image.

Prepare your future. It wasn't the lack of stones that killed the stone age.

naughtydog

Copper - Posts: 90

Joined: May 02, 2002

Location: United Kingdom

Posted: May 03, 2002 at 9:03 AM / IP Logged

Thank fellas...i am just trying to grasp the concept a little better...no particular car!!

We did'nt clarify??? - do you test with the battery connected or not - or does it not matter either way...

Naughtydog

wirewise

Moderator - Posts: 489

Joined: March 07, 2002

Location: California, United States

Posted: May 03, 2002 at 9:09 AM / IP Logged

Leave it connected.

~wirewise~ Verify all wiring with your meter before making any connections!

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Working out resistor values

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