SWS ± Troubleshooting
54B-29
Inspection Procedure I-1
Headlamp, tail lamp: Tail lamp do not illuminate. Probable cause
The column switch or the front-ECU may be defective. D Malfunction of column switch
D Malfunction of front-ECU
D Malfunction of harness wire or connector
NOTE
If only one lamp does not illuminate, the harness wire between the lamp and front-ECU may be defective
or the light bulb may be burned out. In this case, check the tail lamp circuit.
OK
Replace the Front-ECU.
Is a diagnosis code output when the ignition switch is at the
OFF (LOCK) position?
Yes
Carry out troubleshooting while referring to the Diagnosis
Code Chart on P.54B-7.
No
MUT-II input signal check
D Tail lamp switch
NG
Check the tail lamp switch input circuit. (Refer to P.54B-45, Inspec-
tion Procedure N-14.)
Inspection Procedure I-2
Headlamp, tail lamp: Headlamps (low-beam) do not
illuminate.
Probable cause
The column switch or the front-ECU may be defective. D Malfunction of column switch
D Malfunction of front-ECU
D Malfunction of harness wire or connector
NOTE
If only one of the headlamps (low-beam) does not illuminate, the harness wire between the headlamp
and front-ECU may be defective or the headlamp bulb may be burned out. In this case, check the headlamp
circuit.
OK
Replace the Front-ECU.
No
MUT-II input signal check
D Headlamp switch
NG
Check the headlamp switch input circuit. (Refer to P.54B-45, In-
spection Procedure N-14.)
Is a diagnosis code output when the ignition switch is at the
OFF (LOCK) position?
Yes
Carry out troubleshooting while referring to the Diagnosis
Code Chart on P.54B-7.
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