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The airbag light on the dashboard comes for few reasons, either there is a bad connection or connection came loose but than the light would stay on at all times, if it comes periodically than I would look up to the owner's manual and also find the airbag check label inside the car as it might be faulty or in need of replacement. The danger is that if it is faulty it can blow up by itself or in case of accident (hope none happens) it will malfunction.
do you whant to disable the air bags or the air bag light on the dashboard?? if you want to disable the air bag mecanism you just have to take the fuse out of the fuse box under the dash or under the hood near the battery.
i took the whole dash apart once to change my radio. some of the wires inside the dash are either for the emergency lights, air bag or temp sensor. that small hump on the top of the dash near the windshield is a sensor.
Part of the Speedo on a Golf has a connection to the engine immobiliser
If a fuse has popped it was for a reason
Is there a warning light on the dash display which looks like an engine with an arrow through it ??
You need a man with a laptop and software to check which codes have ben lost or corrupted
There is a part between the air intake manifold and the air box on your engine, it's usually black on a golf, will look like a 15cm tube around 80-90mm in diameter with a plugged wire leading into it, this is your MAF sensor or MASS AIR FLOW sensor and if dirty / faulty can cause an incorrect temp reading from the air intake and cause rough engine starting, this is a very common problem on mk4 golfs...
the part is apparently cleanable, with isoprop alcohol, or I assume white spirit.
the actual sensor needs to be removed from its housing for cleaning, and as always treat carefully... the part replacement, depending on where you go can be around $50 - $100 used or even new.... part number off the existing one on your car, try ebay as you can do well for price :)
could be fouled spark plugs from rich fuel mix on bad airtemp sensor, could be a million things but the MAF sensor is one of the golden oldies I'd be checking first :)
Possible trouble areas are drivers side air bag, spiral cable in column, wiring to the air bag sensor assembly or the sensor assembly its self. Without a competent technician using the proper diag tools it would hard to pin point the problem.
Apparently, this problem you are experiencing is quite common in VW MK4 Golfs, it's not the bulb but the lighting connection behind your switch. If you bang the right hand side sides your gan controls your fan lights should appear again. Sounds crazy but it's true. I know few people with VW Golf who have this problem.