Mitsubishi Electric 55624R(S)-MF Service Manual page 179

13. HEADLIGHT ACTIVATION CIRCUIT
Ignition
switch (ACC)
alarm
light
relay
THEFT-ALARM SYSTEM
Description of operation
The ECU transistor is turned
opened without use of the key. This energizes the headlight
relay to activate the headlight.
Checking the headlight activation circuit (Disconnect the
connector of the ECU, then short-circuit terminal No.2 (YL line)
and activate the headlight relay)
Step
1
2
3
Diode
TSB Revision
ON
Check object
Headlight relay ter-
minal voltage
Headlight terminal
Battery
voltage
positive
voltage
Headlight terminal
The
voltage
light
voltage
isn't
turned
if the vehicle door, etc. are
Cause
ov Harness damaged or Repair the
disconnected harness
Malfunction of the Replace the
headlight. Harness headlight or
damaged or discon- dimmer
switch
Malfunction of Dim- Repair the
harness