Inspection Procedure 5

Inspection Procedure 5: The Combination Meter Light Does Not Illuminate Normally Or The Multi Information Display Is Not Displayed Normally.

CAUTION: Before replacing the combination meter, be sure to check that the power supply circuit, ground circuit, and communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)
When the signal from each ECU is received via the CAN communication, the combination meter illuminates the corresponding display light or warning light, or has the multi information display to display corresponding information.
If the lights do not illuminate or the multi information display does not display normally, the wiring harness and connector(s) in the CAN bus lines, or the each ECU or the combination meter may have a problem.

TROUBLESHOOTING HINTS
- The combination meter may be defective
- The each ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1.Using scan tool MB991958, diagnose the CAN bus line.







CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.

NO : Repair the CAN bus line.

STEP 2. Using scan tool MB991958, read the combination meter diagnostic trouble code.

Check again if the DTC is set to the combination meter.

Q: Is the DTC set?

YES : Troubleshoot the combination meter. Diagnostic Trouble Code Descriptions

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read for any diagnostic trouble code.

Check again if the DTC is set to the engine control module, TC-SST-ECU, WCM, KOS-ECU, ASC-ECU, SRS-ECU, ETACS-ECU and A/C-ECU.

Q: Is the DTC set to the any of the above?

YES [Set to the engine control module.] : Troubleshoot the engine control module (Refer to Diagnosis). Diagnostic Trouble Code Descriptions

YES [Set to the TC-SST-ECU.] : Troubleshoot the TC-SST (Refer to Diagnosis). Diagnostic Trouble Code Descriptions

YES [Set to the ASC-ECU.] : Troubleshoot the ASC (Refer to Diagnosis). Diagnostic Trouble Code Descriptions

YES [Set to the WCM.] : Troubleshoot the WCM (Refer to diagnosis). Diagnostic Trouble Code Descriptions

YES [Set to the KOS-ECU.] : Troubleshoot the KOS (Refer to Diagnosis). Diagnostic Trouble Code Descriptions

YES [Set to the SRS-ECU.] : Troubleshoot the SRS (Refer to Diagnosis). Diagnostic Trouble Code Descriptions

YES [Set to the ETACS-ECU.] : Troubleshoot the ETACS. Diagnostic Trouble Code Descriptions

YES [Set to the A/C-ECU.] : Troubleshoot the A/C (Refer to Auto A/C Diagnosis). Diagnostic Trouble Code Descriptions

NO [The diagnostic trouble code is not set.] Go to Step 4.

STEP 4. Using scan tool MB991958, check actuator test.

1. Turn the ignition switch to the "ON" position.
2. Conduct the actuator test of the combination meter.
- Item 7: Indicator1
- Item 8: Indicator2
- Item 9: Indicator3
- Item 10: Indicator4

3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the check result normal?

YES : Go to Step 5.

NO : Replace the combination meter.

STEP 5. Check by scan tool MB991958 "Special Function"

Using scan tool MB991958, select "Test" from the special function of the combination meter. Execute the following item to check the liquid crystal display.

- Item 2: LCD(AUTO)

Q Is the check result normal?

YES : Go to Step 6.

NO : Replace the combination meter.

STEP 6. Retest the system.

Check that display lights or warning lights are illuminated normally, or multi information display is displayed normally.

Q Is the check result normal?

YES : The trouble can be an intermittent malfunction.

NO : Replace the combination meter.