DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK DTC
INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
INSPECT BATTERY
CHECK CAN COMMUNICATION LINE
CHECK DTC (CAN COMMUNICATION SYSTEM)
PERFORM ACTIVE TEST USING GTS (INDICAT. LAMP BRAKE)
CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)
INSPECT PARKING BRAKE SWITCH
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARKING BRAKE SWITCH)
PERFORM ACTIVE TEST USING GTS (BRAKE WARNING LIGHT)
VEHICLE STABILITY CONTROL SYSTEM - Brake Warning Light Remains ON
DESCRIPTION
The brake warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.
WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the master cylinder solenoid, perform zero point calibration and store the system information ().
Check for DTCs ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output | B |
| | REPAIR CIRCUIT INDICATED BY OUTPUT DTC ()
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| 2.INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
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Check the skid control ECU (master cylinder solenoid) connector connection.
- OK:
- The connector is securely connected.
| | CONNECT CONNECTOR TO ECU CORRECTLY |
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Check the battery voltage.
- Standard voltage:
- 11 to 14 V
Result| Result | Proceed to |
| OK | A |
| NG (for 1VD-FTV) | B |
| NG (for 1UR-FE) | C |
| NG (for 3UR-FE) | D |
| | GO TO CHARGING SYSTEM (ON-VEHICLE INSPECTION) ()
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| | GO TO CHARGING SYSTEM (ON-VEHICLE INSPECTION) ()
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| | GO TO CHARGING SYSTEM (ON-VEHICLE INSPECTION) ()
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| 4.CHECK CAN COMMUNICATION LINE
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Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and the GTS on.
Select "CAN Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.
- OK:
- "CAN Bus Check" indicates no malfunctions in CAN communication.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
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| | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
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| 5.CHECK DTC (CAN COMMUNICATION SYSTEM)
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Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and the GTS on.
Check for DTCs (for LHD: , for RHD: ).
Result| Result | Proceed to |
| CAN system DTC is not output | A |
| CAN system DTC is output (for LHD) | B |
| CAN system DTC is output (for RHD) | C |
| | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
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| | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
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| 6.PERFORM ACTIVE TEST USING GTS (INDICAT. LAMP BRAKE) |
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.
Check the condition of the brake warning light by operating the GTS.
Combination Meter| Tester Display | Test Part | Control Range | Diagnostic Note |
| Indicat. Lamp Brake | Brake Warning Light | ON or OFF | Perform the test with the vehicle stopped and engine idling. |
- OK:
- The warning light turns on when operating the GTS.
| | GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
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| 7.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
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Disconnect the skid control ECU (master cylinder solenoid) connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| A24-46 (IG1) - Body ground | Ignition switch ON | 11 to 14 V |
Text in Illustration| *a | Front view of wire harness connector
(to Skid Control ECU (Master Cylinder Solenoid)) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)
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Turn the ignition switch off.
Disconnect the skid control ECU (master cylinder solenoid) connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A24-1 (GND1) - Body ground | Always | Below 1 Ω |
| A24-32 (GND2) - Body ground | Always | Below 1 Ω |
| A25-4 (GND3) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid]) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 9.INSPECT PARKING BRAKE SWITCH |
Disconnect the E53 parking brake switch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| 1 - Body ground | Parking brake applied
(Switch pin free) | Below 1 Ω |
Parking brake released
(Switch pin pushed in) | 10 kΩ or higher |
Text in Illustration| *a | Component without harness connected
(Parking Brake Switch Assembly) |
| | REPLACE PARKING BRAKE SWITCH ASSEMBLY ()
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| 10.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARKING BRAKE SWITCH) |
Turn the ignition switch off.
Disconnect the E53 parking brake switch connector.
Disconnect the 2D main body ECU (cowl side junction block LH) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 2D-22 - E53-1 | Always | Below 1 Ω |
| 2D-22 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 11.PERFORM ACTIVE TEST USING GTS (BRAKE WARNING LIGHT) |
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.
ABS/VSC/TRC| Tester Display | Test Part | Control Range | Diagnostic Note |
| Brake Warning Light | Brake warning light | Warning light ON/OFF | Observe the combination meter. |
When performing the Brake Warning Light Active Test, check Brake Warning Light in the Data List.
ABS/VSC/TRC| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Brake Warning Light | Brake warning light/ ON or OFF | ON: Warning light on
OFF: Warning light off | - |
Result| Result | Proceed to |
| Data List Display | Data List Display when Performing Active Test ON/OFF Operation |
| ON | Changes between ON and OFF | A |
| Does not change between ON and OFF (for LHD) | B |
| Does not change between ON and OFF (for RHD) | C |
| OFF | Changes between ON and OFF | A |
| Does not change between ON and OFF (for LHD) | B |
| Does not change between ON and OFF (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) |
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