Inspection Procedure 1

The Multi-center Display does not Show any Information.

Multi-center Display Power Supply And Ground Circuit Part 1:

Multi-center Display Power Supply And Ground Circuit Part 2:

CIRCUIT OPERATION
The multi-center display 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
- Damaged wiring harness and connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set

STEP 1. Check the multi-center display ground circuit at the multi-center display connector C-09 by backprobing.




1. Do not disconnect the multi-center display connector C-09 and measure at the harness side.




2. Measure the resistance between terminal 6 and ground by backprobing.
- 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 connector C-09 for damage.

Q: Is the multi-center display connector C-09 in good condition?

YES: Go to Step 3.

NO: Repair or replace the connector. Refer to Harness Connector Inspection.







STEP 3. Check the wiring harness between multi-center display connector C-09 and ground.

NOTE: After checking joint connector C-78, check the wires. If joint connector C-78 is damaged, repair or replace the wiring harness. Refer to Harness Connector Inspection.

Q: Is the wiring harness between multi-center display connector C-09 and ground in good condition?

YES: There is no action to be taken.

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

STEP 4. Check the multi-center display power supply circuit (battery) at the multi-center display connector C-09 by backprobing.




1. Do not disconnect the multi-center display connector C-09 and measure at the harness side.




2. Measure the voltage between terminal 1 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 7

NO: Go to Step 5.




STEP 5. Check multi-center display connector C-09 for damage.

Q: Is multi-center display connector C-09 in good condition?

YES: Go to Step 6.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. The multi-center display should work normally.







STEP 6. Check the wiring harness between C-09 and battery.

NOTE: After checking joint connector C-78 and intermediate connector C-89, check the wires. If joint connector C-78 and intermediate connector C-89 are damaged, repair or replace the wiring harness. Refer to Harness Connector Inspection.

Q: Is the wiring harness between C-09 and battery in good condition?

YES: There is no action to be taken.

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

STEP 7. Check the multi-center display power supply circuit [ignition switch (ACC)] at the multi-center display connector C-09 by backprobing.




1. Do not disconnect the multi-center display connector C-09 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 connector C-09 for damage.

Q: Is multi-center display connector C-09 in good condition?

YES: Go to Step 9.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. The multi-center display should work normally.










STEP 9. Check the wiring harness between C-09 and ignition switch (ACC).

NOTE: After checking joint connector C-78 and junction block connector C-108 and C-111, check the wires. If joint connector C-78 and junction block connector C-108 and C-111 are damaged, repair or replace the wiring harness. Refer to Harness Connector Inspection.

Q: Is the wiring harness between C-09 and ignition switch (ACC) in good condition?

YES: There is no action to be taken.

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

STEP 10. Check the multi-center display power supply circuit [ignition switch (IG1)] at the multi-center display connector C-09 by backprobing.




1. Do not disconnect the multi-center display connector C-09 and measure at the harness side by backprobing.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 2 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: Replace the multi-center display. The multi-center display should work normally.

NO: Go to Step 11.




STEP 11. Check the multi-center display connector C-09 for damage.

Q: Is multi-center display connector C-09 in good condition?

YES: Go to Step 12.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. The multi-center display should work normally.










STEP 12. Check the wiring harness between multi-center display connector C-09 and ignition switch (IG1).

NOTE: After checking joint connector C-78 and junction block connector C-111 and C-112, check the wires. If joint connector C-78 and junction block connector C-111 and C-112 are damaged, repair or replace the wiring harness. Refer to Harness Connector Inspection.

Q: Is the wiring harness between multi-center display connector C-09 and ignition switch (IG1) in good condition?

YES: There is no action to be taken.

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