Inspection Procedure 3: The Screen is not Normal in the Navigation Mode: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Confirmation in MMCS service mode 

   Check the items below in the MMCS service mode. (Refer to SERVICE MODE  .)

   • Perform the "COMMUNICATIONS & CONNECTION CHECK" in the MMCS service mode to check that the communication and wire connection with the GPS are in good condition. (Refer to COMMUNICATIONS & CONNECTION CHECK ).
   • Perform the "VEHICLE SIGNAL CHECK", and then check the status of the vehicle speed signal. (Refer to VEHICLE SIGNAL CHECK ).
   • Perform the "SENSOR CHECK", and then check the status of the vehicle speed sensor and the gyro sensor. (Refer to SENSOR CHECK ).

   Q: Is the check result normal? 

   • YES (OK for all):  Go to  Step 6.
   • NO < GPS is not OK >:  Go to Step 2.
   • NO < The vehicle speed sensor is not OK, or vehicle speed pulse does not increase after starting from a standstill >:  Go to  Step 3.
   • NO < Gyro sensor is not OK >:  Go to  Step 6.
2. STEP 2. Confirming GPS signal reception 
   1. Activate the multivision display.
   2. Press the [INFO] button.
   3. Select "GPS Information".
   4. Wait for 5 minutes, and then check whether GPS signal can be received.

   Q: Can GPS signal be received? 

   • YES:  Go to  Step 6
   • NO:  Perform Inspection Procedure 5 "GPS signal cannot be received" (Refer to INSPECTION PROCEDURE 5: GPS SIGNAL CAN NOT BE RECEIVED.  .), and then go to  Step 6.
3. STEP 3. Check the speed meter. 

   Check whether the speed meter works normally.

   Q: Does the speedometer work normally? 

   • YES:  Go to Step 4.
   • NO:  Diagnose the combination meter (Refer to Combination meter - Diagnosis - TROUBLE SYMPTOM CHART ).
4. STEP 4. Check combination meter connector C-04 and multivision display connector C-105 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is combination meter connector C-04 and multivision display connector C-105 in good condition? 

   • YES:  Go to Step 5.
   • NO:  Repair or replace the damaged component (Refer to HARNESS CONNECTOR INSPECTION ).
5. STEP 5. Check the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-105 (terminal 11). 
   • Check the communication line for open circuit and short circuit.

   Q: Is the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-105 (terminal 11) in good condition? 

   • YES:  Go to Step 6.
   • NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
6. STEP 6. Substitute a known good multivision display, and check the trouble symptom. 

   Check whether the navigation screen is normal.

   Q: Is the navigation screen normal? 

   • YES:  Replace the multivision display.
   • NO:  Replace the combination meter.