Inspection Procedure 3

INSPECTION PROCEDURE 3: The daytime/nighttime display mode on multi-center display does not switch.

CAUTION: Before replacing the multi-center display, ensure that the power supply circuit and the ground circuit are normal. (Check that the voltage is 10 V or more.)

COMMENTS ON TROUBLE SYMPTOM
Shift between the daytime and nighttime display mode is controlled by the CAN information from ETACS-ECU. If the daytime/nighttime display mode cannot be shifted, the multi-center display, CAN bus line, or ETACS-ECU may be faulty.

TROUBLESHOOTING HINTS
- The multi-center display may be defective
- The ETACS-ECU may be defective
- Malfunction of the CAN bus line

TROUBLESHOOTING HINTS
- The multi-center display may be defective
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

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 SWS monitor." How to Connect SWS Monitor
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. Check that the nighttime brightness is set dimmer than the daytime brightness.

Q: Is the nighttime brightness set dimmer than the daytime brightness?

YES : Go to Step 3.

NO : Change the nighttime brightness setting. Check that the switching of daytime/nighttime display mode on multi-center display is performed.

STEP 3. Check that the combination meter brightness is reduced when the taillight is illuminated.

Q: Is the combination meter brightness reduced when the taillight is illuminated?

YES : Replace the multi-center display. Check that the switching of daytime/nighttime display mode on multi-center display is performed.

NO : Replace the ETACS-ECU. Check that the switching of daytime/nighttime display mode on multi-center display is performed.