INSPECTION PROCEDURE 7: The navigation screen is not displayed at all: Diagnosis

Required Special Tools: 

• MB991223: Harness Set

1. STEP 1. Check that the navigation system map disc can be inserted and ejected. 

   Q: Can the navigation system map disc be inserted and ejected? 

   YES:  Go to Step  9

   NO:  Go to Step 2

2. STEP 2. Check navigation unit connector F-10 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is navigation unit connector F-10 in good condition? 

   YES:  Go to Step 3.

   NO:  Repair the damaged parts. Then, check that the navigation screen is displayed.

   Fig 1: Identifying Connector F-10 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the battery power supply circuit to the navigation unit. Measure the voltage at navigation unit connector F-10. 
   1. Disconnect navigation unit connector F-10 and measure the voltage available at the wiring harness side of the connector.
      Fig 2: Identifying Connector F-10 Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Measure the voltage between terminal 8 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

   Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

   YES:  Go to Step  5.

   NO:  Go to Step 4.

   Fig 3: Measuring Voltage Between Terminal 8 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the wiring harness between navigation unit connector F-10 (terminal 8) and the battery. 
   Fig 4: Identifying Connector F-10 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-29, C-25 and joint connector C-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-29, C-25 and joint connector C-01 are damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between navigation unit connector F-10 (terminal 8) and battery in good condition? 

   YES:  No action is necessary and testing is complete.

   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. Check that the navigation screen is displayed.

   Fig 5: Locating Intermediate Connector C-29, C-25 And Joint Connector C-01

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the battery power supply circuit to the navigation unit. Measure the voltage at navigation unit connector F-10. 
   1. Disconnect navigation unit connector F-10 and measure the voltage available at the wiring harness side of the connector.
   2. Turn the ignition switch to the "ACC" position.
      Fig 6: Identifying Connector F-10 Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Measure the voltage between terminal 5 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

   Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

   YES:  Go to Step  7.

   NO:  Go to Step 6.

   Fig 7: Measuring Voltage Between Terminal 5 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between navigation unit connector F-10 (terminal 5) and ignition switch (ACC). 
   Fig 8: Identifying Connector F-10 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-29, C-25 and joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-29, C-25 and joint connector C-03 are damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between navigation unit connector F-10 (terminal 7) and battery in good condition? 

   YES:  No action is necessary and testing is complete.

   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. Check that the navigation screen is displayed.

   Fig 9: Locating Intermediate Connector C-29, C-25 And Joint Connector C-03

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check the ground circuit to the navigation unit. Measure the resistance at navigation unit connector F-10. 
   1. Disconnect navigation unit connector F-10 and measure the resistance available at the wiring harness side of the connector.
      Fig 10: Identifying Connector F-10 Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Measure the resistance value between terminal 4 and ground.
      • The resistance should be 2 ohms or less.

   Q: Is the measured resistance 2 ohms or less? 

   YES:  Go to Step  9.

   NO:  Go to Step 8.

   Fig 11: Measuring Resistance Value Between Terminal 4 And Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
8. STEP 8. Check the wiring harness between navigation unit connector F-10 (terminal 4) and ground. 

   Q: Is the wiring harness between navigation unit connector F-10 (terminal 4) and ground in good condition? 

   YES:  No action is necessary and testing is complete.

   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. Check that the navigation screen is displayed.

   Fig 12: Identifying Connector F-10 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check the DIN cable connector shape and engagement between the navigation unit and the radio, the CD player, and CD changer. 

   Q: Is there any abnormality to the DIN cable connector shape and engagement between the navigation unit and the radio, CD player, and CD changer? 

   YES:  Go to Step 10.

   NO:  Replace the DIN cable, the navigation unit, or the radio, CD player and CD changer. Check that the navigation screen is displayed.

10. STEP 10. DIN cable inspection between the navigation unit and the radio, CD player, and CD changer 

    Q: Is the DIN cable between the navigation unit and the radio, CD player, and CD changer normal? 

    YES:  Go to Step 11.

    NO:  Replace the DIN cable. Check that the navigation screen is displayed.

11. STEP 11. Check multi-center display connector C-31 and radio, CD player and CD changer connector C-134 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are multi-center display connector C-31 and radio, CD player and CD changer connector C-134 in good condition? 

    YES:  Go to Step 12.

    NO:  Repair the damaged parts. Then, check that the navigation screen is displayed.

    Fig 13: Locating Multi-Center Display Connector C-31 And CD Changer Connector C-134

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
12. STEP 12. Check the wiring harness between multi-center display connector C-31 (terminal 7, 8, 17) and radio, CD player and CD changer connector C-134 (terminal 27, 28, 39). 

    Q: Are the wiring harness between multi-center display connector C-31 (terminal 7, 8, 17) and radio, CD player and CD changer connector C-134 (terminal 27, 28, 39) in good condition? 

    YES:  Go to Step 13.

    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. Check that the navigation screen is displayed.

    Fig 14: Locating Multi-Center Display Connector C-31 And CD Changer Connector C-134

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
13. STEP 13. Temporarily replace the navigation unit, and check that the navigation screen is displayed. 

    Q: When the navigation unit is temporarily replaced, is the navigation screen displayed? 

    YES:  Replace the navigation unit. Check that the navigation screen is displayed.

    NO:  Go to Step 14.

14. STEP 14. Temporarily replace the multi-center display, and check that the navigation screen is displayed. 

    Q: When the multi-center display is temporarily replaced, is the navigation screen displayed? 

    YES:  Replace the multi-center display. Check that the navigation screen is displayed.

    NO:  Replace the radio, and the CD player and CD changer. Check that the navigation screen is displayed.