Renault Kangoo, horn not working, have checked wiring and tested it, also fuse ok. Please advise if the horn feeds through the ECU unit?

not sure if this link will help you out..... https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1CHBD_en-GBGB719GB719&ion=1&espv=2&ie=UTF-8#q=wiring+diagram+for+2009+Renault+Trafic+115+cdi+WIRES+FEEDING+ECU+AND+FUSE+BOX+RELAYS

Best to have the ECU and IP scanned. IP could have shorted leaving the light on. If a relay is stuck or ECU keeps the glow plugs hot. This will eventually burn out the glow plugs.

Had this problem before ,in fact its quite common on the S type with this engine and i think you will need to check the voltages for the heaters i find that one or the other out of the four doesnt have any 12v power ,and trying to find the correct wiring circuit is like a hidden treasure trove ,the 12v heater circuit comes from the ECU and the fault lies here so what i do to make them work and please remember iam a old fleet comercial mechanic not a dealer unit changer i make a feed from a supply via the ignition circuit this will make them work correctly for the emissions test but the light will still be on .To test the circuit remove the multiplug to the sensor and where you have two white wires this is the 12v feed ,do check the earth to make sure its ok but one of the wires is the feed and the other is the ground.you can incoperate a a fuse into the feed wire of 5 amp but a couple of connectors and a fuse of the larger type straight onto the legs ,i wouldnt advise you to take a feed from the other sensor and this could cause that circuit to go down as well ,i have no idea why this happens on these vehicles but i suspect that the chips in the ECU could be made in china and are not of the best quality .

long shot try this
http://www.autozmagz.com/search/renault+kangoo+wiring+

-You already have spark. Next check fuel and power at injectors.

mai Lor

check fixing wires of the horn, if wires are fixed properly, may be the horn is defective and you have to change it.

hi check the terminal connections at the horn attach test light to one and hold prob to other get assistance to press horn test light should light up if it lights up all good to that point attach wire from battery + terminal to one horn terminal and earth other to see if horn working

Most common cause is a failed indicator relay. Just swap it with a known good one to confirm whether it's faulty but ensure it's correctly rated for your Kangoo.

After that, the next most common causes are more expensive: the indicator switch and the hazard light switch.

A fuse always blows for a reason. The reason your fuse must have blown was because of a short to ground in the horn switch. That means the power side of the horn switch is currently touching ground or metal or that the switch is bad on the inside. The more remote possiblity is that you have a short somewhere in the wiring harness. It is always typical for a component to go bad before a harness.

Here are some notes directly from chrysler, let me know if you need any clarification:

Testing and Inspection Notes WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIRBAGS AND SEAT BELTS/AIRBAGS BEFORE ATTEMPTING STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Disconnect and isolate the battery negative cable. Remove the lower steering column cover/knee blocker. Check for continuity between the metal steering column jacket and a good ground. There should be continuity If OK, go to Step 2. If not OK, refer to Steering and Suspension/Steering Column and check for proper installation of the steering column mounting nuts.
2. Remove the driver's airbag module. Unplug the horn switch wire connector. Remove the horn relay from the Power Distribution Center (PDC) . Check for continuity between the steering column half of the horn switch feed wire connector and a good ground. There should be no continuity If OK, go to Step 3. If not OK, repair the short circuit as required.
3. Check for continuity between the steering column half of the horn switch feed wire connector and the horn relay control circuit cavity for the horn relay in the PDC. There should be continuity If OK, go to Step 4. If not OK, repair the open circuit as required.
4. Check for continuity between the horn switch feed wire and the horn switch ground wire on the airbag module. There should be no continuity If OK, go to Step 5. If not OK, replace the faulty horn switch.
5. Depress the center of the airbag module cover and check for continuity between the horn switch feed wire and the horn switch ground wire on the airbag module. There should be continuity If not OK, replace the faulty horn switch.

I had the same problem. Horn not working and indicators not self cancelling.
After removing the steering wheel I found that the central two pronged collet, that engages with the steering wheel and drives the horn contact slipring and indicator cancellation, had worn down its prongs. this had caused the horn wires to stop rotating and they had been snapped by the motion of the steering wheel.
the ideal solution would be to replace the collet and horn wires but I managed to repair both