2002 vw passat horn wiring diagram would like to see a schematic of wiring from the clock spring in steering wheel to horn relay to horn

It is not a relay problem it is a clock spring contact issue under the steering wheel.

Do you have a air bag light lit on the instrument cluster ? I ask this because , if the air bag light is lit , could be a clock spring problem . I know ,what the heck is this guy talking about . You have a air bag on the steering wheel ,the horn button is on the steering wheel . The clock spring is located under the steering wheel , in the top of the steering coulmn . It has flat wire tape in side that allows the steering wheel to be turned full left to full right , keeping the horn , air bag , an any other button's on the steering wheel connected electricly to the vehicle. Plus there is a relay , when you push the horn button it energizes the relay turning on the horns. Watch these videos , will explain a little better .
VEHICLE RELAYS Operation Diagnosis
How cars clock spring works

The horn relay is located in the under hood fuse box .

Was Cruise Control working before the New Horn was installed? The power supply to the Horn, (input to ground wire) is connected to the Cruise Control Module (CCM). This CCM is wired to the Relay Switch Box located in the Engine Bay. The Relay Box cover will have a Chart indicating what function each Relay coresponds to. Your local autoparts store (AutoZone) can test the Relay Switch, and you'll know (if any Relay) need to be replaced.

The CCM is also wired to the Steering Wheel, but first passes through the Clock Spring Coil, located just behind the Steering Wheel. The Clock Spring allowes for the Function Buttons on the Steering Wheel to have power while Steering Wheel spins.

The Clock Spring can malfunction or break, its rare, but this will cut power to the Function Buttons on Steering Wheel. If ALL the buttons on Steering Wheel dont work, then the Clock Spring is the Culprit. The Coil may need to be replaced.

The Cruise Control Module itself may have failed and also would cause a few or all Steering Wheel Functions to quit working.

But first check the Relay Switch Box and examine the Harness Cables connecting (Steering Wheel--to--CCM--to--Relay Switch Box--to--Battery Supply).

Also if Cruise Control was working before the new Horn was installed and now not working, then most likely the Problem is a bad wire connection somewhere and/or is a faulty Relay.

(Any Questions/comments [email protected])

Arturo, Passat fuse/relay locations and alarm schematic. Check the attached links,instruction and guides, Good luck
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posible clock spring under the steerin wheel

Check,test or replace a worn out battery

After you have a good battery, have to find out
what the horn circuit looks like

Need a wiring diagram for that

May be your horn system is part of the clock spring
under the steering wheel & that item is worn & needs
to be replaced

Could be the fuse for the horn, the horn relay or the clock spring in the steering wheel column.

Best to start with jumpering the horn relay, to check the horns to the fuse.

Take a jumper wire, and jumper across the normally open contacts in the horn relay socket ( listing in the owners manual ). This is shown as the red line in the picture below.


If the horn does not work with the jumper wire, check the fuse ( engine compartment fuse # 7 ) with a meter. IF the fuse has power on both pins on the back of the fuse, next is to install the jumper and test the horn connector for power & ground ( Yellow w/ light green is from the jumper in the relay socket and black is ground ). If you do not have power using the Yellow w. Light green wire & the black, try another ground, to see if it is an issue with the ground wire. This is to a ground lug on the passenger side inner fender.

If the horn does work, check pin #2 with a meter set to continuity from pin #2 ( diagram above ) and a known good ground. While checking this, have someone press the horn switch on the steering wheel. If you do not get a low resistance (

you may have a problem with the clock spring ( this is the unit that connects the steering wheel to the air bag) if you remove the steering wheel and earth out the horn pin and it works there is a fair chance it is the clock spring.; go to the reckors and get a second hand clock spring but ask them the precautions to take as they are a delicate item and easy to break

Replace the Clock spring. It is mounted behind steering wheel. It alows electrical connection while the wheel turns.

You most likely need a new clock spring rotating contact under the steering wheel, it is a plastic ribbon with wire in it to connect the horn button and other accessories to the steering wheel while allowing the wheel to turn.