Inspection Procedure 3

INSPECTION PROCEDURE 3: Check The Power Supply Circuit System Of Multi-center Display.

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 multi-center display may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set

STEP 1. Check multi-center display connector C-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector.






Q: Is multi-center display connector C-32 in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts. Then, check that the power supply circuit of multi-center display is normal.

STEP 2. Check the battery power supply circuit to the multi-center display. Measure the voltage at multi-center display connector C-32.




1. Disconnect multi-center display connector C-32 and measure the voltage available at the wiring harness side of the connector.




2. Measure the voltage between terminal 26 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 4.

NO : Go to Step 3.

STEP 3. Check the wiring harness between multi-center display connector C-32 (terminal 26) and the battery.









NOTE: Also check joint connector C-01 and intermediate connector C-29 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-01 and intermediate connector C-29 are damaged, repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between multi-center display C-32 connector (terminal 26) 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 power supply circuit of multi-center display is normal.

STEP 4. Check the battery power supply circuit to the multi-center display. Measure the voltage at multi-center display connector C-32.




1. Disconnect multi-center display connector C-32 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 25 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 multi-center display connector C-32 (terminal 25) and ignition switch (ACC).









NOTE: Also check joint connector C-03 and intermediate connector C-29 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 and intermediate connector C-29 are damaged, repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between multi-center display C-32 (terminal 25) and ignition switch (ACC) 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 power supply circuit of multi-center display is normal.

STEP 6. Check the battery power supply circuit to the multi-center display. Measure the voltage at multi-center display connector C-32.




1. Disconnect multi-center display connector C-32 and measure the voltage available at the wiring harness side of the connector.
2. Turn the ignition switch to the "ON" position.




3. Measure the voltage between terminal 36 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 multi-center display connector C-32 (terminal 36) and ignition switch (IG1).









NOTE: Also check junction block connector C-211, C-215 and joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-211, C-215 and joint connector C-03 are damaged, repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between multi-center display C-32 (terminal 36) and ignition switch (IG1) 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 power supply circuit of multi-center display is normal.

STEP 8. Check the ground circuit to the multi-center display. Measure the resistance at multi-center display connector C-32.




1. Disconnect multi-center display connector C-32 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 28 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 multi-center display connector C-32 (terminal 28) and ground.









NOTE: Also check joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 is damaged, repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between multi-center display connector C-32 (terminal 28) 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 power supply circuit of multi-center display is normal.

STEP 10. Temporarily replace the multi-center display, and check that the screen is displayed to the multi-center display.

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

YES : Replace the multi-center display. Check that the power supply circuit of multi-center display is normal.

NO : Return to Step 1.