Dtc P0504 Brake Switch A / B Correlation

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Gr-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)

CHECK ECM (STP AND ST1- VOLTAGE)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 1 INTEGRATION RELAY)

DTC P0504 Brake Switch "A" / "B" Correlation


DESCRIPTION

The stop light switch assembly is a duplex system that transmits 2 signals: STP and ST1-. These 2 signals are used by the ECM to monitor whether or not the brake system is working properly. If both signals, which indicate the brake pedal is being depressed or released, are detected simultaneously, the ECM interprets this as a malfunction in the stop light switch assembly and stores the DTC.

HINT:
The normal signal conditions are as shown in the table below.

Signal (ECM Terminal)
Brake Pedal Released
In Transition
Brake Pedal Depressed
STP
OFF
ON
ON
ST1-
ON
ON
OFF
  1. [OFF] denotes ground potential
  2. [ON] denotes battery potential (+B)
  3. On the GTS, both the Data List items Stop Light Switch and ST1 are ON when the brake pedal is depressed because the ST1 indication characteristic is opposite to the Stop Light Switch indication.

DTC No.
DTC Detection Condition
Trouble Area
P0504
Conditions (a) and (b) continue for 0.5 seconds or more
(1 trip detection logic):
(a) Ignition switch is ON
(b) STP signal is off when ST1- signal is off
  1. Open or short in stop light switch signal circuit
  2. Stop light switch assembly
  3. STOP fuse
  4. ECM

WIRING DIAGRAM

  1. for LHD:

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. for RHD:

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
  1. Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
  2. Stop light switch assembly conditions can be checked using the GTS
    1. Connect the GTS to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the GTS on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch and ST1.
    5. Check the Data List indication when the brake pedal is depressed and released.

      Brake Pedal Operation
      		Stop Light Switch
      		ST1
      Depressed
      		ON
      		ON
      Released
      		OFF
      		OFF
1.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the stop light switch assembly connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A73-1 (B) - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Switch Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)
OK


2.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the stop light switch assembly connector.

  1. Turn the ignition switch to ON.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A73-5 (B) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Switch Assembly)


NG
Go to step 6
OK


3.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)

  1. Disconnect the stop light switch assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    A73-3 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK ECM (STP AND ST1- VOLTAGE)

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the ECM connector.

  1. Turn the ignition switch to ON.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:

    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    A38-35 (ST1-) - Body ground
    		Brake pedal released
    		7.5 to 14 V
    Brake pedal depressed
    		Below 1.5 V
    A38-36 (STP) - Body ground
    		Brake pedal released
    		Below 1.5 V
    Brake pedal depressed
    		7.5 to 14 V

    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    A52-35 (ST1-) - Body ground
    		Brake pedal released
    		7.5 to 14 V
    Brake pedal depressed
    		Below 1.5 V
    A52-36 (STP) - Body ground
    		Brake pedal released
    		Below 1.5 V
    Brake pedal depressed
    		7.5 to 14 V

    Text in Illustration
    *A
    		for LHD
    		*B
    		for RHD
    *a
    		Brake Pedal Depressed
    		*b
    		Brake Pedal Released
    *c
    		Front view of wire harness connector
    (to ECM)
    		-
    		-


NG
Go to step 5
OK

REPLACE ECM (Click here)

5.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

  1. Disconnect the stop light switch assembly connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:

    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    A73-2 (L) - A38-36 (STP)
    		Always
    		Below 1 Ω
    A73-4 (L) - A38-35 (ST1-)
    		Always
    		Below 1 Ω
    A73-2 (L) or A38-36 (STP) - Body ground
    		Always
    		10 kΩ or higher
    A73-4 (L) or A38-35 (ST1-) - Body ground
    		Always
    		10 kΩ or higher

    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    A73-2 (L) - A52-36 (STP)
    		Always
    		Below 1 Ω
    A73-4 (L) - A52-35 (ST1-)
    		Always
    		Below 1 Ω
    A73-2 (L) or A52-36 (STP) - Body ground
    		Always
    		10 kΩ or higher
    A73-4 (L) or A52-35 (ST1-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)

6.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 1 INTEGRATION RELAY)

  1. Remove the No. 1 integration relay from the No. 2 engine room relay block.

  1. Disconnect the stop light switch assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    A73-5 (B) - 1R-1
    		Always
    		Below 1 Ω
    A73-5 (B) or 1R-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO ECM POWER SOURCE CIRCUIT (Click here)