DESCRIPTION
When the ignition switch is ON, the airbag sensor assembly transmits front seat inner belt status signals to the combination meter assembly through CAN. If the driver seat belt is not fastened, the combination meter assembly blinks the driver side seat belt warning light. If the seat belt is fastened, the warning light goes off.
NOTICE:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The seat belt warning system uses the CAN communication system. First, confirm
that there are no malfunctions in the CAN communication system. Refer to How to
Proceed with Troubleshooting (See page ).
PROCEDURE
1. |
CHECK DTC OUTPUT (AIRBAG SYSTEM) |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTCs are not output |
A |
DTCs are output |
B |
B | ![]() |
GO TO AIRBAG SYSTEM |
|
2. |
READ VALUE USING TECHSTREAM (LEFT SIDE BUCKLE SW) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / SRS Airbag / Data List.
(e) Read the Data List according to the display on the Techstream.
SRS Airbag
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Left side Buckle SW |
Driver side seat belt buckle switch/Unset, Set or NG |
Unset: Driver side seat belt unfastened Set: Driver side seat belt fastened NG: Data not determined |
- |
Result |
Proceed to |
---|---|
Unset or Set is displayed on the Techstream according to the driver seat belt condition |
A |
Unset or Set is not displayed correctly on the Techstream according to the driver seat belt condition |
B |
NG is displayed on the Techstream |
C |
B | ![]() |
REPLACE FRONT SEAT INNER BELT ASSEMBLY LH |
C | ![]() |
REPLACE AIRBAG SENSOR ASSEMBLY |
|
3. |
REPLACE MAIN BODY ECU |
(a) Temporarily replace the main body ECU with a new or known good one (See page
).
|
4. |
CHECK SEAT BELT WARNING LIGHT |
(a) Check the operation of the seat belt warning light (See page
).
OK:
The seat belt warning light operates normally.
OK | ![]() |
END (MAIN BODY ECU WAS DEFECTIVE) |
NG | ![]() |
REPLACE COMBINATION METER ASSEMBLY |
Confirm Vehicle Headunit Functionality
PROCEDURE
1.
CHECK CUSTOMER'S CELLULAR PHONE COMPATIBILITY
(a) Go to TIS "Bluetooth" Compatibility Portal and check if the cellular phone
is compatible.
Result
Result
Proceed to
Cellular phone is compatible
...
Sending Malfunction (Navigation to APGS) (U0073,U0100,U0129,U0140,U0155,U0164)
DESCRIPTION
These DTCs are stored when a malfunction occurs in the CAN communication circuit.
DTC Code
DTC Detection Condition
Trouble Area
U0073
CAN bus connection error
CAN communication system
U0100
...
Check Bus 5 Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no
resistance exists between terminal 15 (CA5H) of the central gateway ECU (network
gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 16 (CA5L) of the central
gateway ECU (network gateway ECU) and ...