The MMCS stores a lot of information which your customer registers in
its memory. Some of this information will be cleared when the battery terminals are disconnected.
Therefore, the preset channels must be stored before the vehicle battery is disconnected. Vehicle’s
current position and destinations must be stored if the vehicle battery remains disconnected
for long periods.
DIAGNOSIS TIPS CONCERNING THE ENTIRE SYSTEM
If at least two system functions
are defective at the same time, it is possible that communication between the system components
is abnormal. Check the system using the communication and wire connection check in the service
mode.
If an error is displayed, check that relevant wiring harness connectors
are engaged correctly. If a failure is found, repair the connectors and check the trouble symptom
again.
If the wiring harness connectors are engaged correctly, check the
wiring harness. If the wiring harness is in good condition, replace relevant component(s). Now
the error code and the service mode data must be stored.
note
If a system communication related failure is suspected, diagnose the
system.
DIAGNOSIS TIPS CONCERNING THE NAVIGATION FUNCTION
The precision of the GPS positioning
is limited due to its operation principles. So, some of customer reports do not mean that the
system is defective. Prior to troubleshooting, interrogate your customer about how the navigation
system is used and where he/she drives. If you determine that the system is OK, explain
to your customer about how the system works and how the customer should operate it.
If the system is not OK, diagnose the system according to the trouble
symptom chart.