Dtc P0504 Brake Switch A / B Correlation

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK ECM (STP AND ST1- VOLTAGE)

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 sets the DTC.

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 to 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


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.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 intelligent tester. 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. STP signal conditions can be checked using the intelligent tester.
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the tester on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Stop Light Switch.
    5. Check the STP signal when the brake pedal is depressed and released.

      Brake Pedal Operation
      		Specified Condition
      Depressed
      		STP signal on
      Released
      		STP signal off
1.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.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
    A19-2 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Stop Light Switch Assembly)

  1. Reconnect the stop light switch assembly connector.



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


2.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.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
    A19-4 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Stop Light Switch Assembly)

  1. Reconnect the stop light switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - IG2 RELAY OR IGNITION SWITCH)
OK


3.INSPECT STOP LIGHT SWITCH ASSEMBLY


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Remove the stop light switch assembly.

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

    Standard Resistance:
    Tester Connection
    		Switch Position
    		Specified Condition
    1 - 2
    		Switch pin not pushed
    		Below 1 Ω
    Switch pin pushed
    		10 kΩ or higher
    3 - 4
    		Switch pin not pushed
    		10 kΩ or higher
    Switch pin pushed
    		Below 1 Ω

  1. Reinstall the stop light switch assembly.



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (CAMRY_ACV40 RM000001WI401CX.html)
OK


4.CHECK ECM (STP AND ST1- VOLTAGE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.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:
    Tester Connection
    		Condition
    		Specified Condition
    A24-35 (ST1-) - Body ground
    		Brake pedal released
    		7.5 to 14 V
    Brake pedal depressed
    		0 to 1.5 V
    A24-36 (STP) - Body ground
    		Brake pedal released
    		0 to 1.5 V
    Brake pedal depressed
    		7.5 to 14 V

  1. Reconnect the ECM connector.



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

REPLACE ECM (CAMRY_ACV40 RM0000017UO02YX.html)