A4 B5 no start/ need cancel clutch switch wiring diagram!

[gaudiaudi]

I'm getting the "press the clutch pedal message" and can't for the life of me figure it out... I have no juice getting to the connector of the cancel clutch switch when i turn the key so i dont think its the sensor. Checked all the fuses and relays ... Cant follow the wire since it goes in the radio section. Does anyone have the wiring diagrams or any tips?

I'm desperate ---don't want a tow the car for an electrical issue

[AlexHurley]

I'm not sure I fully understand what you're saying; when you press the clutch in and turn the key, the car doesn't start and the engage clutch message doesn't turn off? If that's the case my first guess is a clutch sensor. Have you tried scanning with vagcom?

[gaudiaudi]

I don't own a vagcom will try to get my hands on one.
What I did is take the fuse panel and the panel above the pedals off.
Gave me acces to the connector and the cancel switch itself. I unpluged the switch and I tested to see if there was power going to the switch when i turn the key. Nothing. I checked every fuse and relays including the ones in the ecu box. They are all fine. I'm thinking it's a connector or wire issue since a while back water was getting in the car (i had a blocked drain under the battery). I can't find the wiring diagram for the circuit

[Mad Cow]

If you want a diagram you need to at least tell us what year your car is, motor would be nice too.

[walky_talky20]

I think this is what you want:



You won't find any power at the clutch switch, because it's actually delivering a *ground* signal to the relay, and there are no fuses involved with that aspect.

This is for a 97-99.5, but the wiring is pretty much identical for the later years too. The circuit is quite simple. If there is an immediate need to get the car going, I'd bypass the starter relay with a jumper wire across the load contacts. Note that this will disable all starter safety features. The car will start in gear, and immediately run over people. It will kill them dead. This is serious, so be careful.

Since you have the knee bolster removed, I would suggest you begin testing of the circuit at the starter relay location. You can test almost everything from that spot. There are 4 pins on the relay. 2 should be hot (12v+) with the key held in the START position. 1 should be ground with the clutch pushed down, and 1 should be a low resistance to ground through the starter solenoid. On that last pin, if you momentarily tap 12v+ to it, the starter should engage, like...right meow. So make sure it's not in gear if you decide to do that test. Actually for any dealings with this circuit. Neutral selected with e-brake pulled is a good idea.

[AlexHurley]

I had something similar happen to me in my b5 s4, I think the clutch sensors are pretty much the same on b5's. The sensor that gets depressed when the clutch pedal is pressed became loose and the plunger wasn't getting pushed in far enough to register a signal so no start. Hope that helps, good luck.

[gaudiaudi]

2000 A4 B5 1.8T quattro

[gaudiaudi]

Thank you walky_talky thats excatly what I was looking for and thanks for the advice I didnt know.

[walky_talky20]

Just checked the 2000 diagram. It is identical.

[gaudiaudi]

Do you know the position or number of the starter relay?

[gaudiaudi]

I think its the 53 in the right side of the front panel ?!

[gaudiaudi]

So the starter relay is the 53 top right. Turns out the cancel switch is good the relay is good and te connector is good but I still get the press the clutch to start te engine message... ( i get 12v between the hot wire and the one at the botom when i press the clutch and i get 0 when i dont while starting the car) also i get 12v between the other two on the relay connector. I don't know where to look next....

[gaudiaudi]

Ok thanks everyone and thank you for the diagram i could have wasted a lot more time on this because of the stupid message in my dashboard... Its the starter :(
Fml