Inspection Procedure 7: Buzzers do not sound normally.
caution
Before replacing the combination meter, be sure to check that the power supply circuit, earth circuit, and communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
When the following signals are received via the CAN communication, the combination meter sounds the incorporated buzzer according to the each pattern. Seat belt reminder function
Ignition switch ON signal
Driver’s seat belt switch signal
Passenger’s seat belt switch signal
Vehicles speed signal
Keyless operation key reminder buzzer <vehicles with KOS>
Ignition switch OFF signal
IG knob push switch ON signal
Driver’s door switch ON signal
Lamp reminder buzzer function
Ignition switch OFF signal
Lighting switch ON signal
Driver’s door switch ON signal
Door-ajar warning buzzer function
Ignition switch ON signal
Any door switch or tailgate switch ON signal
Vehicles speed signal
Freeze warning buzzer function
Ignition switch ON signal
Ambient temperature signal
Parking brake reminder buzzer function
Ignition switch ON signal
Parking brake switch
Vehicles speed signal
Multi information display interrupt display buzzer
Display condition signal of information display from each warning (When there is a fixed buzzer sounding pattern for each warning, that pattern has the priority.)
Meter information switch operation buzzer
ON signal for combination meter information switch
Turn-signal lamp buzzer function
Turn-signal lamp switch ON signal
ETACS-ECU function customise buzzer, A/C operation buzzer, audio operation buzzer
Sounding request signal from the ETACS-ECU
If the buzzer does not sound normally, the connector(s) and wiring harness in the CAN bus lines, or the ETACS-ECU or the combination meter may have a problem.
PROBABLE CAUSES
Malfunction of combination meter
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set to the combination meter.
Q.
Is the diagnosis code set?
Refer to .
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ABS-ECU, ASC-ECU, KOS-ECU, audio, ETACS-ECU or A/C-ECU.
Q.
Is the diagnosis code set to the any of the above?
Set to the ABS-ECU. : Troubleshoot the ABS. Refer to GROUP 35B -
Troubleshooting .
Set to the ASC-ECU. : Troubleshoot the ASC. Refer to GROUP 35C -
Troubleshooting .
Set to the KOS-ECU. : Troubleshoot the KOS. Refer to GROUP 42B -
Troubleshooting .
Set to the audio. : Troubleshoot the audio. Refer to .
Set to the ETACS-ECU. : Troubleshoot the ETACS-ECU. Refer to .
Set to the A/C-ECU. : Troubleshoot the A/C. Refer to GROUP 55 -
Troubleshooting .
The diagnosis code is not set. : Go to Step 4.
STEP 4. M.U.T.-III actuator test
Perform the actuator test, and check that the buzzers sound normally.
Item 12: Buzzer
Q.
Is the check result normal?
Go to Step 5.
Replace the combination meter.
STEP 5. Retest the system
Check that the buzzers sound normally.
Q.
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 ).