Toyota RAV4 manuals

Toyota Sienna Service Manual: Brake Switch "A" Circuit

DTC P0571 Brake Switch "A" Circuit

DESCRIPTION

When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP fuse and the stop light switch, and the ECM turns the cruise control off.

DTC No.

DTC Detection Condition

Trouble Area

P0571

Voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 sec. or more.
  • Stop light switch
  •  Stop light switch circuit
  •  ECM

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position, and turn the intelligent tester main switch on.
  3. Check the DATA LIST for proper functioning of the stop light switch.

ECM (Cruise control):

ECM

OK: When the brake pedal is operated, the display changes as shown above.

REPLACE ECM

2 CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)

  1. Disconnect the S12 connector from the stop light switch.
  2.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

3 INSPECT STOP LIGHT SWITCH

INSPECT STOP LIGHT SWITCH

  1. Remove the stop light switch.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

  1. Install the stop light switch.

4 CHECK ECM

CHECK ECM

  1. Reconnect the S12 stop light switch connector.
  2.  Disconnect the E4 connector from the ECM.
  3.  Turn the ignition switch to the ON position.
  4. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

REPLACE ECM

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Other materials:

Diagnosis system
1. CHECK BATTERY VOLTAGE Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding. 2. CHECK DLC3 (a) The ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 f ...

Inspection
1. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH  Release the seat belt (Buckle switch is ON).  Check the resistance between the terminals. Standard If the result is not as specified, replace the inner belt assembly.  Inspect the buckle switch.  Fasten ...

Reassembly
1. INSTALL PARKING BRAKE SWITCH ASSEMBLY (a) Install the parking brake switch to the parking brake pedal with the screw. 2. INSTALL PARKING BRAKE CABLE ASSEMBLY NO.1 (a) Connect the parking brake cable No. 1 to the parking brake cable equalizer. (b) Install the parking brake cable No. 1 with ...

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