Hva er dette relè til? (S4 V8)

Ja, da kan jeg opplyse om at jeg antakelig har fått orden på dette problemet!

 

Jeg klippet en av kablene ut fra "sentralås styring" under baksetet, som angivelig skal gå til comfort lukking. Da forsvant trekket fra batteriet, og alle vindu funksjoner virker, untatt det med å lukke vinduer med å holde nøkkelen en stund til siden, i døra.

 

Høres litt sånn ut som tidligere foreslått, at den ledningen har hull i isolasjonen og kortslutter mot noe, sikkert derfor batteriet ble tomt, vinduene prøvde å lukke seg hele tiden via comfort-lukking.

1992-95 Audi 100/S4, Window Relay Rapidly clicking On/Off?

 

Battery going Dead? Windows and Sunroof closing by themselves?

 

Back in 1999, I ran across a weird problem on a friend/customers 1992 Audi S4. He told me that at random times he would come back to his Audi to find that all the windows and sunroof had closed on their own. Huh? The other random occurrence was he would hear a loud clicking sound coming from the bank of relays in the drivers side kick panel under the dashboard. The battery would be quickly drained from this fun little exercise and the relays behind the kick panel would get very hot.

 

Trying to predict "when" this relay clicking problem would occur was not very straightforward. Here is what I found out by spending a day trouble-shooting this car...... :-( The Central locking/Alarm system/Interior light Delay Control Module (V94) which is all incorporated into the door lock Vacuum pump assembly under the back seat, next to the battery, controls this feature which allows closing all the windows and sunroof from the front door lock/key switch.

 

Here is how the system works:

 

When the driver is locking the car door, and holds the key over to close the windows and sunroof, a signal from the door switch is sent to the Central Locking/Alarm module V94. On the V94 there is a yellow wire at pin #8 (Designated T16/8 in the wiring diagram) which then provides a ground signal to the Power Window Control Module (J139) on pin 10/SK.

 

Then the J139 Window Control Module sends a signal to the Automatic Window Closing Relay (J261) (short stubby 50A relay) to initiate closing all the windows and sunroof. The (J262) relay is activated by pin 6/KR from the (J139) window control module. The (J139) control module and the (J261) relay are located behind the lower left kick panel cover, drivers side.

 

If the car battery voltage drops down below normal, the voltage on this yellow wire T16/8 will also drop down towards 9-10 volts, and at some voltage near 10 volts, the Power Window Control Module (J139) will begin to oscillate and rapidly turn the Window Closing relay (J261) on and off in a most bizarre fashion. I was able to duplicate this random problem repeatedly by using some 5-10K ohm resistors to load down the voltage on this yellow wire T16/8 until the problem would begin to occur.

 

On my friends 1992 Audi S4, the aftermarket radio had been installed incorrectly, and was draining the battery down slowly over time. Keeping the battery charged at the normal voltage "seemed" to prevent this problem from occurring. Disconnecting this T16/8 yellow wire from between the (V94) Central lock/Alarm unit and the Window Closing Unit (J139) will also prevent this problem from occurring, and you only lose the window/sunroof closing feature using the door key.

 

The windows and sunroof work normally from inside the car. I suspect there is a problem with the drive circuitry inside the (V94) central locking/Alarm control module. The logic circuit inside the (J139) Window Control Module could also use some redesign to prevent this odd behavior when the drive voltage is somewhere near 9-10 volts.

 

This J139 relay is expecting the control voltage to either be close to ground potential 0.0-2.0 volts when the automatic window/sunroof closing is activated, or up near +12-14V. My friend did not want to fork out the cash to buy a new V94 Central Locking/Alarm etc. unit to see if this would completely eliminate the problem, so I cut the Yellow wire at pin #8 on the V94 Central Locking/Alarm module (Designated T16/8 in the wiring diagram) and disabled this automatic window/sunroof closing feature.

 

At the same time my customer was having this problem , he had talked to another 1993 Audi 100 owner, who had his car at the Audi dealer with this same problem, the dealer had replaced the (J139) module and the (J261) relay but this did not solve the problem.

 

Some time later I found out that the V94 Central Locking/Alarm module had been superseded to a 4A0 862 257J, instead of the earlier 4A0 862 257B, D versions. So, it looks like the complete solution is to replace the V94 Central Locking/Alarm/Interior Light module.

 

The Window/Sunroof Relay has not been superseded, and the Audi dealer is still showing the 441 959 257B as the correct part. I suppose it is possible for the J139 Window Control Module or the J261 Window closing relay to be damaged if the rapidly clicking on/off problem happens for too long as these relays can get very hot.

 

During the last few years, I have talked to several other Audi 100/S4 owners who have also experienced this weird window relay clicking problem when their battery was partially discharged.

 

 

"Kopiert fra SJM"