Toyota Sienna Quiz
Engine hood / door

Power Back Door Warning Buzzer does not Sound

In this manual: Engine hood / door
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
4steps
~24min
2/5difficulty
Done 0 of 4

DESCRIPTION

  • The power back door system uses a warning buzzer built into the back door, which has 3 ways of sounding that are used differently according to the situations:
  1. When all the following conditions are met, the warning buzzer sounds at a cycle of 0.3 seconds: * The ignition switch is turned ON.

* The shift lever is moved into any position except P position.

* The back door is open or the power back door is activated to open. The warning buzzer continues to sound until the back door is fully closed or the shift lever is moved into the P position.
  • While the power back door is operating, the warning buzzer sounds at a cycle of 0.7 seconds. The warning buzzer turns off when the power back door stops. This way of sounding is set to OFF at factory (default setting) and can be customized when required.
  • hen the power back door is activated to open, the warning buzzer that notifies the start of opening of the power back door sounds at 2 cycles of 0.5 seconds. At the start of opening of the power back door, a wireless buzzer (built into the engine room) also sounds.
    • The power back door ECU directly sends a signal to the warning buzzer.

    HINT:

    • Only item 2 can be customized .
    • If all items occur at the same time, item 1 is prior to the others.

    WIRING DIAGRAM

    INSPECTION PROCEDURE

    1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER

    1. Select the ACTIVE TEST and then check that the power back door warning buzzer operates.

    HINT: During the ACTIVE TEST, the intelligent tester sends a signal to the power back door ECU to drive the warning buzzer. If the warning buzzer operates, the warning buzzer itself and the wire harness between the warning buzzer and power back ECU are considered to be functioning normally.

    OK (Power slide door ECU):

    Power slide door ECU

    2 CHECK WIRE HARNESS (POWER BACK DOOR WARNING BUZZER WIRE HARNESS SIDE)

    CHECK WIRE HARNESS
    1. Remove the buzzer connector.
    2. Inspect the buzzer connector side voltage.
      CHECK WIRE HARNESS

    NOTICE: Use an oscilloscope to check the output voltages of the buzzer.

    Voltage

    Voltage

    3 INSPECT POWER BACK DOOR WARNING BUZZER

    INSPECT POWER BACK DOOR WARNING BUZZER
    1. Check the resistance of the buzzer.

    Resistance

    Resistance

    NOTICE:

    • The circuit that causes the buzzer to sounds is built into the back door ECU, not around the buzzer.
    • Directly applying battery voltage to the buzzer does not cause the buzzer to sound.

    4 CHECK WIRE HARNESS (POWER BACK DOOR WARNING BUZZER - POWER BACK DOOR ECU)

    CHECK WIRE HARNESS
    1. Disconnect the P17 buzzer and the P13 ECU connectors.
    2. Check the resistance between the wire harness side connectors.

    Resistance (Check for open circuit)

    Check for open circuit

    REPLACE POWER BACK DOOR ECU

    Test yourself

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