Dtc P0724 Brake Switch B Circuit High
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)
CHECK STOP LIGHT SWITCH ASSEMBLY (INSTALLATION)
CHECK ECM (STP VOLTAGE)
CHECK STOP LAMP SWITCH ASSEMBLY (TERMINAL B VOLTAGE)
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)
REPLACE STOP LIGHT SWITCH ASSEMBLY
REPLACE ECM
SECURELY REINSTALL STOP LAMP SWITCH ASSEMBLY
REPAIR OR REPLACE HARNESS OR CONNECTOR
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
DTC P0724 Brake Switch "B" Circuit High |
DESCRIPTION
This DTC indicates that the stop light switch remains on. When the stop light switch remains on during GO and STOP driving, the ECM interprets this as a fault in the stop light switch. Then the MIL illuminates and the ECM stores the DTC.P0724DTC Detection Drive Pattern
| DTC Detection Condition
| Trouble Area
|
Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less 5 times.
| Stop light switch remains on even when vehicle is driven in GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (1.8 mph)) pattern 5 times (2 trip detection logic).
| - Short in stop light switch signal circuit
- Stop light switch assembly
- ECM
|
Related Data ListDTC No.
| Data List
|
P0724
| Stop Light Switch
|
WIRING DIAGRAM
Refer to DTC P0504 (LandCruiser RM000000XCT16EX_02.html).
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
- HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
| 1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.
Read the value displayed on the tester when the brake pedal is depressed and released.
- OK:
Brake Pedal
| Display
|
Released
| OFF
|
Depressed
| ON
|
| 2.CHECK STOP LIGHT SWITCH ASSEMBLY (INSTALLATION) |
Check the stop light switch assembly installation (LandCruiser RM000003QJQ01EX.html).
| 3.CHECK ECM (STP VOLTAGE) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Brake Pedal Condition
| Specified Condition
|
G57-8 (STP) - Body ground
| Released
| 0 to 3 V
|
Depressed
| 11 to 14 V
|
Text in Illustration*a
| Brake pedal depressed
|
*b
| Brake pedal released
|
*c
| Component with harness connected
(ECM)
|
Reconnect the ECM connector.
| 4.CHECK STOP LAMP SWITCH ASSEMBLY (TERMINAL B VOLTAGE) |
Disconnect the stop light switch connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
A85-1 (B) - Body ground
| Always
| 11 to 14 V
|
A85-5 (B) - Body ground
| Ignition switch ON
| 11 to 14 V
|
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
A85-3 (GND) - Body ground
| Always
| Below 1 Ω
|
Text in Illustration*a
| Front view of wire harness connector
(to Stop Light Switch)
|
Reconnect the stop light switch assembly connector.
| 5.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) |
Disconnect the stop light switch assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
A85-2 (L) - G57-8 (STP)
| Always
| Below 1 Ω
|
A85-4 (L) - G57-9 (ST1-)
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
A85-2 (L) or G57-8 (STP) - Body ground
| Always
| 10 kΩ or higher
|
A85-4 (L) or G57-9 (ST1-) - Body ground
| Always
| 10 kΩ or higher
|
Reconnect the stop light switch assembly connector.
Reconnect the ECM connector.
| 6.REPLACE STOP LIGHT SWITCH ASSEMBLY |
Replace the stop light switch assembly (LandCruiser RM000003QJT01GX.html).
Replace the ECM (LandCruiser RM0000013Z002CX.html).
| 8.SECURELY REINSTALL STOP LAMP SWITCH ASSEMBLY |
Securely reinstall the stop light switch assembly (LandCruiser RM000003QJQ01EX.html).
| 9.REPAIR OR REPLACE HARNESS OR CONNECTOR |
Repair or replace the harness or connector.
| 10.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the intelligent tester to the DLC3.
Clear the DTCs (LandCruiser RM000000PDK1DJX.html).
Turn the ignition switch off for 30 seconds or more.
Turn the ignition switch to ON and turn the tester on.
Start the engine.
Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less 5 times or more.
Confirm that the DTC is not output again.
- HINT:
- Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input DTC P0724.
Check that STATUS is NORMAL.
- HINT:
- If STATUS is NORMAL, DTC judgment is complete and it can be determined that the system is normal.
- If STATUS is INCOMPLETE or N/A, DTC judgment is incomplete. Perform the following procedure again 5 times: accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less.
