DESCRIPTION
The BRAKE warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK THAT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED |
(a) Check the skid control ECU (master cylinder solenoid) connector connection.
OK:
The connector is securely connected.
NG | ![]() |
CONNECT CONNECTOR TO ECU CORRECTLY |
|
2. |
CHECK DTC |
(a) Check for DTCs (See page
).
Result |
Proceed to |
---|---|
DTC is not output |
A |
DTC is output |
B |
B | ![]() |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
3. |
INSPECT BATTERY |
(a) Inspect the battery voltage (See page ).
Standard voltage:
11 to 14 V
NG | ![]() |
CHECK CHARGING SYSTEM |
|
4. |
CHECK BRAKE FLUID LEVEL |
(a) Turn the ignition switch off.
(b) Depress the brake pedal 20 times or more (until the pedal reaction feels light and pedal stroke becomes longer).
(c) Check the amount of fluid in the brake reservoir.
HINT:
When the ignition switch is turned to ON, brake fluid is sent to the accumulator and the fluid level decreases by approximately 5 mm (0.197 in.) from the level when the ignition switch is off (normal).
OK:
Brake fluid level is normal.
NG | ![]() |
CHECK AND REPAIR BRAKE FLUID LEAKAGE |
|
5. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Select CAN Bus Check from the System Selection Menu screen and follow the
prompts on the screen to inspect the CAN bus (See page
).
OK:
CAN Bus Check indicates no malfunctions in CAN communication.
NG | ![]() |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
6. |
PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE WARNING LIGHT) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: ABS/VSC/TRAC / Active Test.
(f) According to the display on the Techstream, perform the Active Test.
ABS/VSC/TRAC
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Brake Warning Light |
Brake warning light |
Warning light OFF/ON |
Observe the combination meter. [Vehicle condition] Vehicle stopped |
(g) Check the Techstream display condition of the brake warning light.
Result
Result |
Proceed to |
---|---|
Display of the Data List remains OFF |
A |
Display of the Data List remains ON |
B |
NG | ![]() |
GO TO METER / GAUGE SYSTEM |
|
7. |
CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) |
(a) Disconnect the skid control ECU connector (master cylinder solenoid).
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(b) Reconnect the skid control ECU (master cylinder solenoid) connector.
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
9. |
INSPECT BRAKE FLUID LEVEL WARNING SWITCH |
(a) Disconnect the B2 brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE BRAKE MASTER CYLINDER SUB-ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) |
|
10. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH) |
(a) Disconnect the S1 skid control ECU (master cylinder solenoid) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
S1-41 (LBL) - B2-2 |
Always |
Below 1 Ω |
S1-41 (LBL) - Body ground |
Always |
10 kΩ or higher |
B2-1 - Body ground |
Always |
Below 1 Ω |
OK | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
IG Supply Voltage Low (C120B)
DESCRIPTION
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C120B
IG Supply Voltage Low
Master cylinder pressure sensor power supply voltage decrease occurs
or history of voltage decrease exists, and ...
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
*1
COMPRESSOR PICK UP SENSOR
*2
MAGNET CLUTCH ASSEMBLY
*3
PRESSURE RELIEF VALVE
*4
COMPRESSOR SPACER
*5
O-RING
...
Status Signal Circuit
DESCRIPTION
This circuit sends a smart key system status signal from the certification ECU
(smart key ECU assembly) to the mobile wireless charger cradle assembly. Based on
this signal, the mobile wireless charger cradle assembly suspends or resumes wireless
charging.
WIRING DIAGRAM
CAUTI ...