US pre-facelift headlights have a rectangular glass lensed headligtht surrounded by a plastic frame, which includes the fog lamp portion. the foglamps use H3 bulbs.
you pull the headlight switch straight out one click in either the parking light or normal on position to turn on the fog lamps.
page 61 of this PDF (page labeled 124) shows the fog and head lamp circuits for 1986-1990
ETM.pdf#page=61
(give the link sufficient time to load and it should take you to page 61).
the circuit looks quite simple. if the fog lamp switch is on, the grey/green wire that is on pin "N" of the headlight switch assembly is powered. this connects to pin 5 of the bulb out sensor unit, which in turn powers pins 6 and 8 for the left and right fog lamps. It appears the fog lamps are unfused on these models.
you pull the headlight switch straight out one click in either the parking light or normal on position to turn on the fog lamps.
page 61 of this PDF (page labeled 124) shows the fog and head lamp circuits for 1986-1990
ETM.pdf#page=61
(give the link sufficient time to load and it should take you to page 61).
the circuit looks quite simple. if the fog lamp switch is on, the grey/green wire that is on pin "N" of the headlight switch assembly is powered. this connects to pin 5 of the bulb out sensor unit, which in turn powers pins 6 and 8 for the left and right fog lamps. It appears the fog lamps are unfused on these models.
