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Home >> Mitsubishi >> 2010 >> Galant L4-2.4L (4G69) >> Repair and Diagnosis >> Instrument Panel, Gauges and Warning Indicators >> Driver/Vehicle Information Display >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Multi-Center Display >> Inspection Procedure 1

Inspection Procedure 1

INSPECTION PROCEDURE 1: The Multi-center Display does not Show any Information.


Multi-Center Display Power Supply Circuit (Part 1):




Multi-Center Display Power Supply Circuit (Part 2):






CIRCUIT OPERATION
The multi-center display unit is energized by the battery through the ignition switch (ACC) and (IG1).

TECHNICAL DESCRIPTION (COMMENT)
The ground circuit, the battery circuit, the ignition switch (ACC) circuit or the ignition switch (IG1) circuit is suspected to be open or defective.

TROUBLESHOOTING HINTS
- Malfunction of the multi-center display unit
- Damaged wiring harness and connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set

STEP 1. Check the multi-center display unit ground circuit. Measure the resistance at the multi-center display unit connector C-05.







1. Disconnect the multi-center display unit connector C-05 and measure at the harness side.







2. Measure the resistance between terminal 6 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES : Go to Step 4.

NO : Go to Step 2.

STEP 2. Check the multi-center display unit connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is the multi-center display unit connector C-05 in good condition?

YES : Go to Step 3.

NO : Repair or replace the connector.

STEP 3. Check the wiring harness between multi-center display unit connector C-05 (terminal 6) and ground.










- Check the ground wire for open circuit.

NOTE: After checking joint connector (2) C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. check the wires. If joint connector (2) C-03 is damaged, repair or replace the wiring harness.

Q: Is the wiring harness between multi-center display unit connector C-05 (terminal 6) and ground in good condition?

YES : There is no action to be taken.

NO : Repair the wiring harness. The multi-center display unit should work normally.

STEP 4. Check the multi-center display unit power supply circuit (battery). Measure the voltage at the multi-center display unit connector C-05.







1. Disconnect the multi-center display unit connector C-05 and measure at the harness side.







2. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES : Go to Step 7.

NO : Go to Step 5.

STEP 5. Check multi-center display unit connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is multi-center display unit connector C-05 in good condition?

YES : Go to Step 6.

NO : Repair or replace the connector. The multi-center display unit should work normally.

STEP 6. Check the wiring harness between C-05 (terminal 1) and battery.










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

NOTE: Also check intermediate connector C-29 and joint connector (1) C-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-29 and joint connector (1) C-01 is damaged, repair or replace the wiring harness.

Q: Is the wiring harness between C-05 and battery in good condition?

YES : There is no action to be taken.

NO : Repair the wiring harness. The multi-center display unit should work normally.

STEP 7. Check the multi-center display unit power supply circuit [ignition switch (ACC)]. Measure the voltage at the multi-center display unit connector C-05.







1. Disconnect the multi-center display unit connector C-05 and measure at the harness side.
2. Turn the ignition switch to "ACC" position.







3. Measure the voltage between terminal 3 and ground by backprobing.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES : Go to Step 10.

NO : Go to Step 8.

STEP 8. Check multi-center display unit connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is multi-center display unit connector C-05 in good condition?

YES : Go to Step 9.

NO : Repair or replace the connector. The multi-center display unit should work normally.

STEP 9. Check the wiring harness between C-05 (terminal 3) and ignition switch (ACC).










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

NOTE: Also check joint connector (2) C-03, and intermediate connector C-29 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If or joint connector (2) C-03 or intermediate connector C-29 is damaged, repair or replace the wiring harness.

Q: Is the wiring harness between C-05 (terminal 3) and ignition switch (ACC) in good condition?

YES : There is no action to be taken.

NO : Repair the wiring harness. The multi-center display unit should work normally.

STEP 10. Check the multi-center display unit (middle grade type) power supply circuit [ignition switch (IG1)]. Measure the voltage at the multi-center display unit (middle grade type) connector C-05.







1. Disconnect the multi-center display unit connector C-05 and measure at the harness side.
2. Turn the ignition switch to "ON" position.







3. Measure the voltage between terminal 2 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES : Replace the multi-center display unit.

NO : Go to Step 11.

STEP 11. Check the multi-center display unit connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is multi-center display unit connector C-05 in good condition?

YES : Go to Step 12.

NO : Repair or replace the connector. The multi-center display unit should work normally.

STEP 12. Check the wiring harness between multi-center display unit connector C-05 (terminal 2) and ignition switch (IG1).













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

NOTE: Also check joint connector (2) C-03, junction block connector C-211 and C-215 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector (2) C-03 or junction block connector C-211 or C-215 is damaged, repair or replace the wiring harness.

Q: Is the wiring harness between multi-center display unit connector C-05 (terminal 2) and ignition switch (IG1) in good condition?

YES : The procedure is complete.

NO : Repair the wiring harness. The multi-center display unit should work normally.
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