[JohanSL]

My right hand horn sit right behind the headlamp, and not behind the bumper as I read elsewhere?

Its not working, I removed it and tested it on a spare battery - its dead, BUT ................. so is the wiring?? I connected my electrical tester to the wires and pushed the horn (on steering wheel) and, nothing!
I do not understand perhaps the horn had gone bad and caused another problem. The left side horn does work.

Does anyone have a wiring diagram for the horn?

 

[bayhas]

My right hand horn sit right behind the headlamp, and not behind the bumper as I read elsewhere?

Its not working, I removed it and tested it on a spare battery - its dead, BUT ................. so is the wiring?? I connected my electrical tester to the wires and pushed the horn (on steering wheel) and, nothing!
I do not understand perhaps the horn had gone bad and caused another problem. The left side horn does work.

Does anyone have a wiring diagram for the horn?

I thought thats the ATA (alarm) horn...

 

[JohanSL]

Aha, I might be wrong I did not know that the alarm use a separate horn?
That might be why there is no reading on my volt meter when I push the horn.

 

[Merc-S600]

My left hand Horn dident work too when i 1st board this Car , i check't just like you did,no Power ran to it ,i even connected a different horn wich also dident work ,but still i went out and board a new MB Horn, connected it and boom ,it work't just like b4 , looks like the W140 likes to b spoiled and wants its own Private Parts ,try a Horn of similarshape maybe it will work out for you .
Ciao:thumbsup:
By the way ,is your Car fitted with the Original Factory Alarm,there should b a light on the Dash wich says it has it.

 

[JohanSL]

By the way ,is your Car fitted with the Original Factory Alarm,there should b a light on the Dash wich says it has it.

Don't know, there's no light on the dash that look alarm related so I suppose not. What does the light look like?

 

[Merc-S600]

Hi Johan
Sorry i mistak't with my other Car wich has the Alarm light on the Dash & the Tripcomputer alarm in the W140 ,whereever fitted , the W140's fitted with the Alarm by MB have a verry small triangle fitted with a square Button in the Centre of it , on either the left or right side ( maybe both sides (?)-) above where the Seatbelts retracts into on the Top ,it should look like a Square press Button,this will only alowe u to have a Dog or a Person sitting in the Car with the Alarm On , when you arm the Alarm ( if Fitted ) the Blinkers should also flash once or twice but some dont even do that .
AS for the Horn Power ,i could b wrong ( wouldent surprise me ) but it could well be that the right hand Horn supplies the Power to the Left hand side Horn and thats why most likely ,when we check if there is Power and there is none ,that you need to have someone to push the Hornbutton while you check if there is any Power to it with your Power checking Gadjet ( did this make any sense ? lol ) ,if it does work out to b like this it would explain why my Horn started working again after i installed a New MB one .
Hopefully this will help u out , i Surrender .:surrender:
Ciao
Alarm info is on Page 41 in the Owners Manual (S500 Manual)

 

[bayhas]

Hi Johan
Sorry i mistak't with my other Car wich has the Alarm light on the Dash & the Tripcomputer alarm in the W140 ,whereever fitted , the W140's fitted with the Alarm by MB have a verry small triangle fitted with a square Button in the Centre of it , on either the left or right side ( maybe both sides (?)-) above where the Seatbelts retracts into on the Top ,it should look like a Square press Button,this will only alowe u to have a Dog or a Person sitting in the Car with the Alarm On , when you arm the Alarm ( if Fitted ) the Blinkers should also flash once or twice but some dont even do that .
AS for the Horn Power ,i could b wrong ( wouldent surprise me ) but it could well be that the right hand Horn supplies the Power to the Left hand side Horn and thats why most likely ,when we check if there is Power and there is none ,that you need to have someone to push the Hornbutton while you check if there is any Power to it with your Power checking Gadjet ( did this make any sense ? lol ) ,if it does work out to b like this it would explain why my Horn started working again after i installed a New MB one .
Hopefully this will help u out , i Surrender .:surrender:
Ciao
Alarm info is on Page 41 in the Owners Manual (S500 Manual)

Early ATA does not have a warning light, mine doesnt, my car does not have an immobilizer, yet the horns will go off if you open a door without unlocking the car properly, 10 min after you have previously locked it.

 

[Brett San Diego]

Aha, I might be wrong I did not know that the alarm use a separate horn?
That might be why there is no reading on my volt meter when I push the horn.

Yep. There's a high and low pitch horn. One on either side. Both are tucked just behind the bumper cover corners.

Brett

 

[Merc-S600]

Hi Johan
Let me understand one thing,you say that your Horn is behind the Headlamp,where it cannot be acsessed from the bottom but only by opening the Hood , right ?,have you had a look from underneat the Front Bumper ,look up onto the far sides with a Torch and look for the Horns or maybe even the Connectors or a holding bracket ,what i come up with is that the supposed to be Horn behind the Headlamp must be 1 of the Alarm Horns instead ,since those need a more secure Space / Position within the Car as Car thieves could cut the wiring from underneat,pretty obvious ,u know what i mean ,my Car has a loose connector on the right side too,it's a slightly bigger black Connector plug,it just sitts there ,i have no idea what it is ,it could well b that it is what u have there ,i will investigate into this .
Ciao
Horntime now .....

 

[JohanSL]

You can not even reach it from above, its behind the headlamp in the headlamp cradle - you have to remove the headlamp to get to it.
I'll look under the car this afternoon.

I would still like to know how do I determine whether my car has an alarm system or not?

 

[Merc-S600]

That makes 2 of us , i never heard mine or have seen any sirens or flashing Blinkers or have a Triangle fitted above the Seatbelts but the Manual says that it supposed to arm in 10 seconds ,i guess that it is not fitted , i will have to hire a Car thief and see what happens ,LOL,or force a door open and see if it goes of ,on my Alfa Romeo Gt all i had to do was Kick a Tyre hard inaf and it would go off .
Ciao

 

[Merc-S600]

This is the Man who has an Alarm in his W140 and this Man could tell us how it works just that this Man dosent know how to use the god dam thing .
No Offence Bazooka-tooth but if u r reading this could you add some info about the Alarm u have installed,how it works , how it gets activated etc ..we all asume with the Remote Key automatically , obviously but is there a Siren somewhere or extra Horns like behind the Headlights or under them ?? .
Ciao
http://www.benzworld.org/forums/w140-s-class/1432759-half-my-locking-system-doesnt-work.html