Mitsubishi MOTORS Laser 1991, Service Manual, Page: 220 / 320

Ignition switch Lighting switch Dimmer passing switch
Headlight relay
ON
“ACC” or “ON”
“ACC”
or “ON”
“HEAD”
“PASS“
ON
ON
Turning the ignition switch to the ON position
causes the headlight relay, daytime running light
relay
and tail light relay to be energized,
which causes the headlights, tail lights, etc. to
come on.
Placing the lighting switch in the HEAD position
causes the headlight relay and daytime running
light relay
to be energized.
If the dimmer/passing switch is placed in the LO
position at this time, the headlights light up in low
beam.
Placing the lighting switch in the HEAD position
causes the headlight relay and daytime running
light relay
to be energized.
If the dimmer/passing switch is placed in the HI
position at this time, the headlights light up in
high beam.
l This indicator illuminates during use of the high
beam of the headlights, and when the passing
signal (high beam) is activated, thus indicating
that the headlights’ high beam is illuminated.
1. Headlights don’t come on.
But the tail lights do illuminate.
Check the headlight relay.
Check the multi-purpose fuse
The tail lights also don’t illuminate.
Check the lighting switch.
2. The low beam at both sides doesn’t illuminate.
Check the “LO” contacts of the dimmer
switch.
3. The upper beam at both sides doesn’t illuminate.
The passing signal functions OK.
Check the “HI” contacts of the dimmer
switch.
The passing signal doesn’t function.
Check the dimmer switch.
Check the daytime running light relay
Check the transistor relay.
4. One headlight doesn’t illuminate.
Check the bulb.
5. Can’t switch from low to high beam or
vice-versa.
Check the dimmer switch.
6. With the ignition switch at the “ON” position, the
headlights’ low beam does not illuminate.
Check the daytime running light relay
Check the transistor relay.
7. The high beam indicator light doesn’t illuminate.
The high beam of the headlights is normal.
Check dedicated fuse No.
Check the bulb.