Central Locking

Cynical26 · 08-04-17, 10:57 PM

After a couple of false starts with items from eBay, I fitted a replacement central locking pump today.

Original pump part No. 4A0862257A
Replacement part No. 4A0862257C

Same electrical connections for both.

Vacuume pipes have already been tested and passed as functional without leaks.

Anyway, new pump fitted and it won't operate the locks from the driver's side. The door just locks and unlocks without activating the others. The central locking does work properly when using the key or button on the passenger side. This will also lock and unlock the driver's door.

Question is: Is there an electric switch connected to the system behind the door card? Or should the movement of the door lock closing the vacuume pump in the door do the job on its own?

Hanuman · 09-04-17, 01:09 AM

Item 4. It should have a 3pin(?) plug. Both doors. Don't be too surprised if you find that someone has tried to tap into it for an alarm system, or fitted a non switched one from another part of the car, or other vehicle completely, or simply not reconnected it properly after some repairs.

Do you know how to do a continuity test? You should be able to identify the correct pins on the plug to the vacuum pump.

(All of the above based on my knowledge gleaned from working on other models, so don't shoot me if I'm off on a tangent)

Cynical26 · 09-04-17, 05:41 PM

Cheers Mark.

I removed both of the door cards and swapped over the lock actuator pump from the (working) passenger side. Still nothing.

Checked the loom, found a break in the wire somewhere between the door and the central locking pump. Couldn't pin point where the break was so jointed in a new wire at either end.

An hour of stripping out half of the car's trim and wrapping the loom, and new wire in tape the whole way, and the problem is sorted.

Now I've got fully functioning central locking for the first time since buying the car

John. · 09-04-17, 05:54 PM

Quote:

Originally Posted by Cynical26

Now I've got fully functioning central locking for the first time since buying the car

Nice one

Another wee job done.

sinbin5t · 09-04-17, 05:57 PM

Great stuff !

Cynical26 · 09-04-17, 07:24 PM

Quote:

Originally Posted by John.

Nice one

Another wee job done.

It's a good feeling knowing each step is a step forward

I need to proof read things more closely before posting

Fat thumbs don't help either!

Hanuman · 09-04-17, 08:49 PM

for breaks in wiring, the passage from door to shell proves popular. Chafing, that sort of thing.

09-04-17, 01:09 AM	#2
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	Item 4. It should have a 3pin(?) plug. Both doors. Don't be too surprised if you find that someone has tried to tap into it for an alarm system, or fitted a non switched one from another part of the car, or other vehicle completely, or simply not reconnected it properly after some repairs. Do you know how to do a continuity test? You should be able to identify the correct pins on the plug to the vacuum pump. (All of the above based on my knowledge gleaned from working on other models, so don't shoot me if I'm off on a tangent) __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

09-04-17, 05:41 PM	#3
Cynical26 Grown up member Join Date: Dec 2016 Location: North Ayrshire Posts: 735	Cheers Mark. I removed both of the door cards and swapped over the lock actuator pump from the (working) passenger side. Still nothing. Checked the loom, found a break in the wire somewhere between the door and the central locking pump. Couldn't pin point where the break was so jointed in a new wire at either end. An hour of stripping out half of the car's trim and wrapping the loom, and new wire in tape the whole way, and the problem is sorted. Now I've got fully functioning central locking for the first time since buying the car Last edited by Cynical26; 09-04-17 at 07:22 PM.

09-04-17, 08:49 PM	#7
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	for breaks in wiring, the passage from door to shell proves popular. Chafing, that sort of thing. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

09-04-17, 05:57 PM	#5
sinbin5t 4 ring whore! Classic Audi Club Member Join Date: Jan 2010 Location: Where a spike points skywards Posts: 12,960	Great stuff !