I complained about a behind ignition relay clicking noise. It is there since I purchased this car in Nov last year. I think it is time to find what is amiss there. One reason is the horn has also died (though I believe, it intermittently comes alive, at times). Remember there is an SRS light permanently ON. Here are the facts:
1. The previous owner claimed that the SRS light turned ON, when he asked his mechanic to fix the horn.
2. Papu Ustad in Rwp, used star diagnostics to solicit the trouble to two crash sensors, one under each front seat for the SRS issue. (I wonder how would crash sensors under the seat, get affected by a work on steering column!)
3. I broke the cruise control, ordered one from ebay and got it fitted a month ago. Electrician next to Papu ustad (the electrician who worked sounds crafty but the owner is a looter -- asked for Rs.2,000 for the job (for fitting cruise control level and HVAC control panel) and at the end settled on Rs.1,000. I told the worker about the relay type problem, he said there is a loose nut there, he changed it. That, I guess, was not the problem as nothing improved after that.
4. That behind ignition clicking sound (repeated relay clicking sound, many times) usually comes when I have recently done something, some action in the car. When that clicking starts, if I put my fingers on the key, I can feel the thumping in the key. Like just started the car, pressed on brake pedal, turned on an indicator, etc and then would remain for 2 - 20 seconds and then settle down. (I have a fear of the steering getting locked while driving!!! Is it possible?
5. The horn used to blow somehow (I mean not right when I wanted with the press on the panel but after fidgeting a bit around) before that but after that, I found the horn more dead than alive. Today I tried to blow it and no matter where I touch, it would not sound.
6. I can hear the horn-relay (not the behind ignition one) clicking when I press to blow for horn but no sound. I have not, as of yet, diagnosed whether the horns blow when 12V applied directly to them or not. Not checked the fuse (if any) too.
My read on this thread:
W202 - Faulty Horn!! - Mercedes-Benz Owners' Forums
makes me guess that, somehow, all these are connected, i.e., the three problems -- SRS light, horn failure and clicking behind ignition key. My guesses are:
- horn relay.
- Clock spring (horn steeringwheel airbag contact ring)
- Some loose connection.
I feel restricted because I do not have proper tools to carry out this job otherwise I believe I am good at debugging. Hadn't really thought at creating a proper tool kit.
Please guide as to what can I do, to localize where the problem really is, before going to the technician. Thanks.