RF Receiver Why can removing blue wire damage locks etc?

Druim · Dec 17, 2011

Well as the title says Why can removing the blue wire/antenna damage locks etc?
Does any other equipment than the key remote use the RF receiver?
Seen words like these about the blue wire removal several times but not the reason:
Replace the RF receiver ASAP or you may find door locks burnt out and a range of other problems.
Removing the blue wire helped me but don't want anything else happening because of it or fork out £££ when not needed so if someone could explain I would be very grateful.

dougdotcom · Dec 17, 2011

Removing the blue wire dose not damage the locks. leaving it in place causes the rf recever to pick up signals that it is not suspose to do causing the battery to run down then this causes the locks to bounce as the door locks loose power. So if the blue wire is off the signals the rf box could do without calnt get into the system, but the very strong ones may still get in.

So replacing with the latest Rf box is the best way to go.

Druim · Dec 17, 2011

Many thanks dougdotcom, makes sense now. Before I removed mine I constantly had to enter EKA but no problem now although the remote only works right next to the receiver.

Datatek · Dec 18, 2011

The early receivers can also suffer internal failures that cause random signals to be sent to the BECM rapidly and repeatedly locking or unlocking the doors thus burning the lock motors.

Rick-the-Pick · Dec 18, 2011

The door locks work off a floating voltage ranging from 5v to 12v.

Not only can the RF receiver bombard the becm with alien signals resulting in excessive voltage, but if the power from the battery drops below 11v can confuse the becm & cause the same problem. This is why door looks still fail when no RF receiver is connected at all.

Druim · Dec 18, 2011

This old'ish car is new to me and IMO it has one or two too many electronic bits, suppose it can all be sorted at £££. Think I will just leave the old receiver for now as I cannot justify changing out parts there may fail, might keep an eye on a used receiver but a little tricky with all the uncertain parts for sale with no part number.
Thank you all for the information.

dougdotcom · Dec 18, 2011

Rick-the-Pick said:
The door locks work off a floating voltage ranging from 5v to 12v.

Not only can the RF receiver bombard the becm with alien signals resulting in excessive voltage, but if the power from the battery drops below 11v can confuse the becm & cause the same problem. This is why door looks still fail when no RF receiver is connected at all.

Hi Rick, can you tell me more about where the system is for the floating voltage? and how the voltage can go above tolerated limits to spike the door latch motors from the Rf box? I understand the voltage for the battery dropping but not the other two reasons. Happy Christmas Rick.

Datatek · Dec 18, 2011

dougdotcom said:
Hi Rick, can you tell me more about where the system is for the floating voltage? and how the voltage can go above tolerated limits to spike the door latch motors from the Rf box? I understand the voltage for the battery dropping but not the other two reasons. Happy Christmas Rick.

I haven't scoped it but I think Ricks description is a bit wide of the mark. The output voltage of the RF to the BECM swings between two levels as it sends data to the BECM, it does not "float". There is no direct electrical connection from the RF to the door locks so it cannot "spike" them. What happens as far as I can determine is that the output of the RF starts to oscillate and some of the changes are recognised by the BECM as commands to lock or unlock. I'm willing to be proved wrong and also to scope what is actually going on for proof

RF Receiver Why can removing blue wire damage locks etc?

Druim

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dougdotcom

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Druim

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Datatek

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Rick-the-Pick

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Druim

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dougdotcom

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Datatek

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