i had a problem like this with my pajero, i checked the heater plugs one by one, they were working ok,the light on the dash was coming on and off as usual but when i put a multimeter to the heater plug supply....nothing.
traced the fault back to it being a faulty heater plug relay.............check your relay out along with the wiring pins to which the relay connects for bad connections/ corrosion .........hope this helps
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