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ford fiesta st 2008 deadlock problems

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=101840
Printed Date: July 15, 2025 at 1:31 AM


Topic: ford fiesta st 2008 deadlock problems

Posted By: tr03bor
Subject: ford fiesta st 2008 deadlock problems
Date Posted: February 03, 2008 at 6:36 PM

THis is what i have figure out regarding the central locking system on the New fiesta ST's

The locking wires in the ST come from relays that are configured in a ‘toggle’ fashion. This means that at any one time the locking wire will be connected to either ground or +ve. The locking wire is never left ‘floating’ ie not connected to any polarity.

To lock all doors; +ve is applied to PIN 2 (yellow/red on drivers door, YELLOW /GREEN on passenger). PIN 4 (double locking wire) and PIN 10 (unlocking wire) are resting to ground at this point.

When the doors are locked the motor spins to the locked position and in doing so catches a switch. This switch, when pressed, flips the connection from one side of the motor to Pin4. One side of the motor is connected to Pin10 whilst the flipped side is connected to Pin4, with both pins being at ground. This stops the motor progressing any further.

To unlock all doors; +ve is applied to PIN 10 (WHITE/ green drivers door, WHITE/ red passenger side). At this time the other side of the motor will be connected to Pin4 (dl wire) which will be at ground. Pin4 is momentarily used as the grounding for the motor. Pin2 (locking wire) will also be at ground and will connect to the motor as soon as the motor moves off from the “locking” switch, keeping a closed circuit thus making the motor fully wind round. The motor will continue to try to turn for as long as +ve is applied to Pin10.

To set deadlocking; when the doors are locked, +ve is applied to Pin4 (deadlocking wire). At this time Pin2 & Pin10 are at ground.

To unset deadlocking (while still keeping the door locked); Pin4 (deadlocking) goes +ve along with Pin10 (unlocking). Pin2 (locking) remains at ground. This moves the motor from deadlocking position where it is connected to Pin2 & Pin10 across to the switch where the motor is connected to Pin4 (+ve) and Pin10 (+ve), halting it at locking position.

Now how would I get my alarm to activate the deadlocking with shortcircuiting the locks??

any help is welcome!

Thanks
Rob




Replies:

Posted By: tr03bor
Date Posted: February 04, 2008 at 2:37 AM
Can anyone help? I do apologise if I have posted this in the wrong section.



Posted By: tr03bor
Date Posted: February 04, 2008 at 12:28 PM
Is thier no one out there that can help me ?



Posted By: tr03bor
Date Posted: February 06, 2008 at 5:38 AM

no one :(!

i really really need some advice!


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