54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > MULTI AROUND MONITOR > SYMPTOM PROCEDURES > A screen is not switched when the vehicle speed reaches a predetermined value.
Inspection Procedure 5: A screen is not switched when the vehicle speed reaches a predetermined value.
COMMENT ON TROUBLE SYMPTOM
The camera-ECU switches the monitor screen according to a vehicle speed signal. If it is not switched, the vehicle speed signal system may be defective.
PROBABLE CAUSES
Malfunction of camera-ECU
Malfunction of CAN bus
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics.
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 2. M.U.T.-IIISE data list.
Using the camera-ECU service data.
Perform a test run of the vehicle.
Item No.
M.U.T.-IIISE display
Check condition
Normal condition
4
Vehicle speed information
Running
Enable
Is the check result normal?
Go to Step 4.
Go to Step 3.
STEP 3. M.U.T.-IIISE other system diagnosis code.
Check if a vehicle speed signal-related diagnosis code is set in the ETACS-ECU (Refer to ).
Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to ).
Go to Step 4.
STEP 4. Retest the system.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).