Inspection Procedure 1

No Screen is Displayed.

Multi Center Display Power Supply And Ground Circuit:

Connectors:

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 harness wires 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-08 by backprobing.
1. Do not disconnect the multi-center display connector C-08 and measure at the harness side.




2. Measure the resistance between terminal 6 and ground by backprobing.

Q: Is the resistance value less than 2 ohm?

YES: Go to Step 4.
NO: Go to Step 2.




STEP 2. Check the multi-center display connector C-08 for damage.

Q: Is the multi-center display connector C-08 in good condition?

YES: Go to Step 3.
NO: Repair or replace it. Refer to Harness Connector Inspection.







STEP 3. Check the harness wires between multi-center display connector C-08 and ground.

NOTE: After checking joint connector C-141, check the wires. If joint connector C-141 is damaged, repair or replace it. Refer to Harness Connector Inspection.

Q: Is the harness wires between multi-center display connector C-08 and ground in good condition?

YES: There is no action to be taken.
NO: Repair them. 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-08 by backprobing.

1. Do not disconnect the multi-center display connector C-08 and measure at the harness side.
2. Measure the voltage between terminal 1 and ground by backprobing.

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

YES: Go to Step 7.
NO: Go to Step 5.




STEP 5. Check multi-center display connector C-08 for damage.

Q: Is multi-center display connector C-08 in good condition?

YES: Go to Step 6.
NO: Repair or replace it. Refer to Harness Connector Inspection. The multi-center display should work normally.










STEP 6. Check the harness wires between C-08 and battery.

NOTE: After checking joint connector C-141 and intermediate connector C-209, check the wires. If joint connector C-141 and intermediate connector C-209 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Is the harness wires between C-08 and battery in good condition?

YES: There is no action to be taken.
NO: Repair them. 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-08 by backprobing.
1. Do not disconnect the multi-center display connector C-08 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.

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

YES: Go to Step 10.
NO: Go to Step 8.




STEP 8. Check multi-center display connector C-08 for damage.

Q: Is multi-center display connector C-08 in good condition?

YES: Go to Step 9.
NO: Repair or replace it. Refer to Harness Connector Inspection. The multi-center display should work normally.










STEP 9. Check the harness wires between C-08 and ignition switch (ACC).

NOTE: After checking joint connector C-141 and junction block connector C-301 and C-308, check the wires. If joint connector C-141 and junction block connector C-301 and C-308 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Is the harness wires between C-08 and ignition switch (ACC) in good condition?

YES: There is no action to be taken.
NO: Repair them. 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-08 by backprobing.

1. Do not disconnect the multi-center display connector C-08 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.

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

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-08 for damage.

Q: Is multi-center display connector C-08 in good condition?

YES: Go to Step 12.
NO: Repair or replace it. Refer to Harness Connector Inspection. The multi-center display should work normally.







STEP 12. Check the harness wires between C-08 and ignition switch (IG1).

NOTE: After checking joint connector C-141 and junction block connector C-301 and C-308, check the wires. If joint connector C-141 and junction block connector C-301 and C-308 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Is the harness wires between C-08 and ignition switch (IG1) in good condition?

YES: There is no action to be taken.
NO: Repair them. The multi-center display should work normally.