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D3 - Everything Else Anything that doesnt fit elsewhere |
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#1
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Disable keyless ?
Is there a way to code out or otherwise disable the keyless entry, even better each door separately ?
Im trying to locate a battery drain, and since it gets worse when its raining, my best guess is one or more of the door handles keep waking the car up while its parked for 20 hours a day.. No fault codes of course. I pulled fuse 42 on the left side of the dash, but that seems to disable the whole car.. It ended up triggering the car alarm when I tried turning the light switch from Auto to 0 (when I locked the car with the key, the front and rear parking lights didn't turn off?)
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06 A8 3,0TDIq My daily driver and project... 97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 14 VW Caddy 1,6TDI from my employer.. (X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E |
#2
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Yes, it may be possible, but may also not be needed. I've had a look through the wiring diagrams and coding / adaptation channels for the modules involved. What I've found out is that the door handles are connected to both J518 module (Access / Start Auth.) and its relevant door module (driver, pass., RR, RL). Each door handle has an aerial and touch sensor. It seems that the aerial wires go to J518 and the touch sensor to the door module.
It's more than likely that the touch sensor(s) are at fault, it is well documented. Unfortunately pulling a fuse will take out a whole system and therefore not recommended. I have a suggestion to remove all touch sensors by physically disconnecting the wire by removing the pin at the door handle or at the door module, whichever is easier. Pin 3 - Gray Black at each handle Pin C12 - Gray Black at front door modules Pin B7 - Gray Black at rear door modules This will allow KESSY to work, along with driver identity and the start button, but locking only by the key-fob. It may introduce an open circuit fault at the door modules. But that's better than a flat battery! You could reintroduce each switch one by one until you find the fault and can then replace it. As I said earlier that KESSY can be coded out, but here the problem is with the touch sensor that is connected to the door module. Should someone want to code KESSY out you will loose function of the start button and driver identity. Furthermore, the driver identity module has component protection so there is a tiny chance CP may kick in.
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Matt 2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN, Last edited by mattylondon; 18th September 2017 at 08:22 AM. Reason: updated pins |
#3
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Ok, but disconnecting these wires is a door disassembly job right ?
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06 A8 3,0TDIq My daily driver and project... 97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 14 VW Caddy 1,6TDI from my employer.. (X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E |
#4
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I gambled that this was the wire you were talking about.. From pin3 on the door handle (G415) to C12 on the Driver door control unit (J386). Grey/black wire.
Your pin assignment and wire color must be from a different year or something I guess, the B-plug in my Elsawin diagram is the one going to the door card switches. I pulled it from the plug on the control unit, so didn't have to remove the door "subframe". But looked inside the "inspection hole" over the door handle, and I can see electrical tape in there...so someone have definitely been inside there and "repaired" something before...
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06 A8 3,0TDIq My daily driver and project... 97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 14 VW Caddy 1,6TDI from my employer.. (X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E |
#5
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Excellent work. When I studied the pin assignment I was looking at the rear doors, glad that you checked for the front doors and didn't pull the wrong wire!
Please do update on the battery drain.
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Matt 2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN, |
#6
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Well I only disconnected the front left door, that certainly didn’t help.. But the wire I disconnected is for the locking button, and that is normally the problem ? Not the «unlock» touch sensor ? Because when I wash the car I notice it comes to life when I use the high pressure across the handles (incl. the disconnected one).. So I wondered if rain was enough to «trigger» the «unlock»-sensor or if I just have to disconnect the other «lock»-buttons as well ?
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06 A8 3,0TDIq My daily driver and project... 97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 14 VW Caddy 1,6TDI from my employer.. (X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E |
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