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 or signal line, the
combination meter sounds the incorporated buzzer according to the each pattern. FCM collision warning buzzer/FCM approaching warning buzzer/FCM
set <Vehicles with FCM and without ACC>
Sounding request signal from the ACC/FCM-ECU
FCM collision warning buzzer/FCM approaching warning buzzer/ACC
approaching warning buzzer/ACC automatic cancelling buzzer/ACC vehicle stop/ACC vehicle-travelling-ahead missing
indication buzzer/ACC, FCM set/ACC, FCM deactivation/cruise control set indication buzzer <Vehicles
with ACC>
Sounding request signal from the ACC/FCM-ECU or engine-ECU
Electric steering wheel lock malfunction warning buzzer <Vehicles
with KOS&OSS>
Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU
uses the following input signals to send a sounding request signal)
Engine switch signal
LIN bus line (local) for electrical steering lock
Actuator driving permission monitoring signal
OSS-related malfunction warning buzzer <Vehicles
with KOS&OSS>
Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU
uses the following input signals to send a sounding request signal)
Engine switch signal
When the following conditions are met, and 1 second or more has elapsed (a: +B1
is detected to be ON and +B2 is detected to be OFF. b: When +B1 is OFF and +B2
is ON, KOS&OSS-ECU detects that the IOD fuse is mounted.).
Engine switch reminder buzzer <Vehicles with KOS&OSS>
Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU
uses the following input signals to send a sounding request signal)
Engine switch ON signal
Driver’s door switch ON signal
Keyless operation key reminder buzzer <Vehicles with
KOS&OSS>
Sounding request signal from the KOS&OSS-ECU (The KOS&OSS-ECU
uses the following input signals to send a sounding request signal)
Engine switch OFF signal
Immobilizer antenna output signal
Driver’s door switch ON signal
Lamp reminder buzzer
Sounding request signal from the ETACS-ECU (The ETACS-ECU uses the following input signals
to send a sounding request signal)
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.)
ETACS-ECU function customise buzzer
Sounding request signal from the ETACS-ECU
Turn-signal lamp buzzer
Turn-signal lamp switch ON signal
Security alarm buzzer
Ignition switch ON signal
Sounding request signal from the ETACS-ECU
Rest reminder buzzer
When the time to take a rest which was set on the multi-information display is reached.
ASTC pre high temperature warning buzzer/ASTC high temperature
warning buzzer <Vehicles with ASTC>
Sounding request signal from the ASTC-ECU
Electric parking brake emergency brake buzzer <Vehicles
with electric parking brake>
Sounding request signal from the electric parking brake ECU
Rear differential lock system <4WD>/FCM <Vehicles
with FCM>/Ultrasonic misacceleration mitigation system <Vehicles with ultrasonic
misacceleration mitigation system>/Hill descent control <Vehicles with ASTC>/Off
road mode cancel buzzer <Vehicles with ASTC>
Sounding request signal from the transfer-ECU, ACC/FCM-ECU, ASTC-ECU, clearance
warning control unit
Speed alarm <Vehicles for GCC>
Ignition switch ON signal
Vehicles speed signal
If the buzzer does not sound normally, the connector(s) and wiring harness in the CAN
bus lines, or the ECUs or the combination meter may have a problem.
PROBABLE CAUSES
Malfunction of combination meter
Damaged harness wires and connectors
Malfunction of ECUs
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 in the combination meter.
Q.
Is the diagnosis code set?
Diagnose the combination meter.
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set in the engine-ECU, A/T-ECU <A/T>,
ABS-ECU <Vehicles without ASTC>, ASTC-ECU <Vehicles with ASTC>,
ACC/FCM-ECU <Vehicles with FCM>, Electric parking brake ECU <Vehicles
with electric parking brake>, KOS&OSS-ECU <Vehicles with KOS&OSS>,
Clearance warning control unit <Vehicles with corner sensor system>, ETACS-ECU
and A/C-ECU <Vehicles with automatic A/C>.
Q.
Is the diagnosis code set in the any of the above?
Set in the engine-ECU. : Troubleshoot the engine (Refer to GROUP 13B -Troubleshooting <6B3>,
GROUP 13C -Troubleshooting <4N1> or GROUP 13E - Troubleshooting <4D5>).
Set in the A/T-ECU. : Troubleshoot the A/T (Refer to GROUP 23A - Diagnosis code chart).
Set in the Transfer-ECU. : Troubleshoot the ES4/SS4 (Refer to GROUP 23A - Diagnosis code chart).
Set in the ABS-ECU. : Troubleshoot the ABS (Refer to GROUP 35B - Troubleshooting).
Set in the ASTC-ECU. : Troubleshoot the ASTC (Refer to GROUP 35C - Troubleshooting).
Set in the ACC/FCM-ECU. : Troubleshoot the ACC or FCM (Refer to GROUP 17 - Troubleshooting ,
or GROUP 35C - Troubleshooting).
Set in the Electric parking brake ECU. : Troubleshoot the Electric parking brake (Refer to GROUP 36 - Troubleshooting).
Set in the KOS&OSS-ECU. : Troubleshoot the KOS&OSS (Refer to GROUP 42B - Troubleshooting).
Set in the Clearance warning control unit. : Troubleshoot the Clearance warning control unit.
Set in the ETACS-ECU. : Troubleshoot the ETACS.
Set to the heater controller assembly (A/C-ECU). : Troubleshoot the A/C. Refer to GROUP 55 - Troubleshooting.
The diagnosis code is not set. : Go to Step 4.
STEP 4. Check by M.U.T.-III "Special Function"
Using M.U.T.-III, select "Test" from the special function of the combination meter. Execute
the following item to check the buzzer.
Item 3: Buzzer (AUTO)
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.