The low-beam head lights on my Mazda 626 (1990) has just stopped working! I have checked all the fuses - all OK. When I switch the lights control-lever to high-beam, all 4 head lights come on, and yet if I switch it back to low-beam, all 4 lights will go off. Does this mean that the 'control unit' at the steering is defective and needs replacing? If this is the case, do I have to replace the whole unit, or can I just replace faulty switch at the base of the lever? Many thanks in advance for your advice.
-Mike