THEFT-ALARM SYSTEM
Troubleshootina
13. HEADLIGHT ACTIVATION CIRCUIT
Ignition
switch (ACC)
alarm
light
relay
Diode
Description of operation
The ECU transistor is turned
ON
if the vehicle door, etc. are
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
line)
and activate the headlight relay)
Step
1
Check object
Cause
Headlight relay ter-
minal voltage
-Ground)
2
Headlight terminal
Battery
ov
Harness damaged or
Repair the
voltage
positive
disconnected
harness
voltage
3
Headlight terminal
The
Malfunction of the
Replace the
voltage
-Ground)
headlight. Harness
headlight or
voltage
light
damaged or
dimmer
isn’t
switch
turned
Malfunction of
Repair the
switch
harness
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