Toyota Sienna Service Manual: Brake Switch A Circuit

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

Other materials:

DTC check / clear
HINT:  Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore, some detailed areas may not be shown exactly the same as on the actual vehicle.  If the system cannot enter the diagnostic mode, inspect all AVC-LAN communication ...

Under hood
GENERAL MAINTENANCE 1. GENERAL NOTES Maintenance requirements very depending on the country. Check the maintenance schedule in the owner's manual supplement. Following the maintenance schedule is mandatory. Determine the appropriate time to service the vehicle using either miles dri ...

Safety Connect LED light Indicators
When the engine switch is turned to the “ON” position (vehicles without a smart key system) or IGNITION ON mode (vehicles with a smart key system), the red indicator light comes on for 2 seconds then turns off.

Related news

  • Ford Fusion: Running-in
  • BMW 5 Series: Storing
  • Nissan Rogue Service Manual: Fuse, fusible link and relay box
  • Chrysler 200: Engine Air Cleaner Filter
  • Removing and reinstalling clips

  • Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit

    Toyota Sienna Service Manual: Brake Switch A Circuit