CHASSIS ELECTRICAL ± Multi-Center Display <High Grade>
54A-97
INSPECTION PROCEDURES FOR EACH TROUBLE SYMPTOM
INSPECTION PROCEDURE 1
TAPE/CD, UML switches do not work. No display appears after the ignition key is turned to ACC.
Check connectors: C-11, C-53, C-54
and DIN connectors between audio and
navigation unit
NG
Repair
OK
Turn off the ignition key and turn to ACC
position again. Does any screen appear
about 30 seconds after it?
YES
Measure at the multi-center display
connector C-52.
D Ignition switch: ACC
D Voltage between terminal (25), (26)
and body earth
OK: System voltage
NG
Repair fuse or harness.
NO
Disconnect multi-center display con-
nector C-53.
D Ignition switch: ACC
D Measure waveform at terminal (7),
(8), (17) of harness connector with
an oscilloscope.
OK: Hi: 4 ± 5 V, Lo: 0 ± 1 V,
pulse signal
OK
Replace the multi-center display.
NG
NG
Repair
Check the harness between audio C-54
and multi-center display C-53 connector.
OK
Does the sound turn on/off when the
audio VOL/POWER switch operated?
NO
NG
Repair fuse or harness.
YES
OK
Measure at audio unit connector C-53.
D Ignition switch: ACC
D Voltage between terminal (10), (11)
and body earth
OK: System voltage
Replace the audio unit.
NG
OK
Replace the DIN cable.
Replace the navigation unit.
Check the DIN cable between audio
and navigation unit.
NG
Repair
OK
Check the harness between audio C-54
and multi-center display C-52 connec-
tor.
NG
OK
Replace the DIN cable.
Check the DIN cable between audio
and navigation unit.
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OK
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