CHASSIS ELECTRICAL ± Multi-Center Display <High Grade>
54A-99
INSPECTION PROCEDURE 2
TAPE/CD, UML switches do not work. (Display appears.)
NG
Repair
OK
Does the audio sound turn on or off
when operate VOL/POWER switch?
NO NG
Repair fuse or harness.
YES
Check the harness between audio C-54
and multi-center display B-09 connector.
NG
OK
OK
NG
Check the DIN cable between audio
and navigation unit.
OK
Are the result of key checking (audio
switch checking in the service function)
normal?
NO
YES
NO
Malfunction of operation switch.
Replace the audio unit.
Replace the navigation unit.
NO
YES
YES
NO
Check the connector of CD changer and
DIN connector between navigation unit
and CD changer.
Is a CD changer connected?
Check connectors: C-11, C-53, C-54
and DIN connectors between audio and
navigation unit
Replace the audio unit.
Measure at audio unit connector C-11.
D Ignition switch: ACC
D Voltage between terminal (10), (11)
and body earth
OK: System voltage
Repair
Replace the DIN cable.
YES
Check again after program-loading is
done. If same error happen, replace
navigation unit.
Insert a map CD-ROM. Does the mes-
sage ªloading the programº appear?
YES
NO
Replace the navigation unit.
Does the sound change in accordance
with the switch operation?
Replace the audio unit.
Does the navigation screens appear
when NAVI switch is pressed?
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