CHASSIS ELECTRICAL – Headlamp
54-33
TROUBLESHOOTING
DIAGNOSIS FUNCTION
INPUT SIGNAL INSPECTION POINTS <VEHICLES WITH ETACS-ECU>
Refer to Group 00 – How to Use Troubleshooting / Inspection Service Points.
The lighting monitor buzzer does not sound even when
the ignition key is removed with the tail lamps or
headlamps ON and the driver’s side door open. [However,
the key reminder warning buzzer sounds when inserting
the key into the ignition key cylinder.
Probable cause
The cause is probably a malfunction of the lighting switch input circuit system or
a malfunction of ETACS-ECU or buzzer ECU. When the key reminder warning buzzer
is sounding, the lighting monitor warning buzzer does not sound even if the tail lamps
or headlamps are lit.
D Malfunction of harness or connector
D Malfunction of ETACS-ECU
D Malfunction of buzzer ECU
<Vehicles with ETACS-ECU>
MUT-II Pulse check
OK: MUT-II buzzer sounds once
when the lighting switch is
turned from OFF to TAIL or
HEAD.
NG
Check the following connectors.
B-79
Repair
OK
Check trouble symptom.
NG
OK
Replace the ETACS-ECU.
<Vehicles with buzzer ECU>
NG
Check the harness in the junction block.
NG
Replace the ETACS-ECU or the buzzer
ECU.
OK
Repair
NG
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