Dtc P0504 Brake Switch A / B Correlation

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
2Az-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE)

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK ECM (STP AND ST1 - VOLTAGE)

INSPECT FUSE (STOP AND IGN FUSE)

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


DESCRIPTION

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

HINT:
The normal conditions are as shown in the table below. The signals can be read using the intelligent tester.

Signal
Brake Pedal Released
In Transition
Brake Pedal Depressed
STP
OFF
ON
ON
ST1-
ON
ON
OFF

DTC No.
DTC Detection condition
Trouble Area
P0504
Conditions (a), (b) and (c) continue for 0.5 seconds or more
(1 trip detection logic):
(a) Ignition switch on (IG)
(b) Brake pedal released
(c) STP signal OFF when ST1- signal OFF
  1. Short in stop light switch signal circuit
  2. Stop light switch
  3. STOP fuse
  4. IGN fuse
  5. ECM

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0504 Brake Switch A / B Correlation


INSPECTION PROCEDURE

HINT:
  1. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 on (IG) and turn the tester ON.
    3. Select the following menu items: Powertrain / Engine and ECT / Data List / Stop Light Switch.
    4. 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)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the A66 stop light switch connector.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the terminals of the A66 stop light switch connector and body ground.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    B (A66-2) - Body ground
    		9 to 14 V
    B (A66-4) - Body ground
    		9 to 14 V

  1. Reconnect the stop light switch connector.



NG
Go to step 4
OK


2.INSPECT STOP LIGHT SWITCH ASSEMBLY
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Remove the stop light switch assembly.

  1. Measure the resistance.

    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
OK


3.CHECK ECM (STP AND ST1 - VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the A12 ECM connector.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the terminals ST1- and STP of the A12 ECM connector and body ground.

    Standard voltage:
    Tester Connection
    		Brake Pedal Operation
    		Specified Condition
    ST1- (A12-35) - Body ground
    		Released
    		9 to 14 V
    Depressed
    		0 to 3 V
    STP (A12-36) - Body ground
    		Released
    		0 to 3 V
    Depressed
    		9 to 14 V

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM

4.INSPECT FUSE (STOP AND IGN FUSE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Remove the STOP and IGN fuses from the main body ECU (instrument panel junction block).

  1. Measure the resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the STOP and IGN fuses.



NG
CHECK FOR SHORTS IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR