Toyota RAV4 manuals

Toyota Sienna Service Manual: Power Back Door Warning Buzzer does not Sound

DESCRIPTION

  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.

  2. 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.
  3. 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.

HINT:

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:

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

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