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Home >> Mitsubishi >> 2009 >> Galant L4-2.4L (4G69) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Procedures >> Inspection Procedure 8

Inspection Procedure 8

INSPECTION PROCEDURE 8: The navigation screen is not displayed at all.

CAUTION: Before replacing the navigation unit or multi-center display, ensure that the power supply circuit and the ground circuit are normal. (Check that the voltage is 10 V or more.)


Part 1:




Part 2:






TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The DIN cable may be defective
- The multi-center display may be defective
- The navigation unit may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set

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

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

YES : Go to Step 2.

NO : Go to Step 3.

STEP 2. Service mode top menu check
1. with the service mode top menu displayed, check if "navi" operation can be accepted. Scan Tool Testing and Procedures

Q: Is the check result normal?

YES : Recheck the trouble symptom. If it is not normal, go to Step 10.

NO : Go to Step 3.

STEP 3. 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 4.

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

STEP 4. 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. 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 6.

NO : Go to Step 5.

STEP 5. Check the wiring harness between navigation unit connector F-10 (terminal 8) and the battery.'







- Check the wiring harness for open circuit and short circuit.







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).

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.

STEP 6. 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.







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 8.

NO : Go to Step 7.

STEP 7. Check the wiring harness between navigation unit connector F-10 (terminal 5) and ignition switch (ACC).







- Check the wiring harness for open circuit and short circuit.







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).

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.

STEP 8. 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.







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 10.

NO : Go to Step 9.

STEP 9. Check the wiring harness between navigation unit connector F-10 (terminal 4) and ground.







- Check the ground wire for open circuit.

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.

STEP 10. Check the DIN cable connector shape and engagement between the navigation unit and multi-center display.

Q: Is there any abnormality to the DIN cable connector shape and engagement between the navigation unit and the multi-center display?

YES : Go to Step 11.

NO : Replace the DIN cable.

STEP 11. DIN cable inspection between the navigation unit and the multi-center display

Q: Is the DIN cable between the navigation unit and the multi-center display normal?

YES : Go to Step 12.

NO : Replace the DIN cable.

STEP 12. 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.

NO : Go to Step 13.

STEP 13. 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.

NO : Replace the DIN cable.
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