Toyota RAV4 manuals

Toyota Sienna Service Manual: Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

Toyota Sienna Service Manual / Audio / visual / Audio and visual system / Diagnostic trouble code chart / Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

DESCRIPTION This circuit is necessary for the ASL (Auto Sound Leveliser) built into the radio receiver.

Speed signals are received from the combination meter and used for the ASL.

The ASL function automatically adjusts the sound data in order to enable hearing the clear audio sound even when vehicle noise increases (as vehicle noise increases, the volume is turned up etc.).

HINT:

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK OPERATION OF SPEEDOMETER

  1. Drive the vehicle and check if the function of the speedometer on the combination meter is normal.

OK: Actual vehicle speed and the speed indicated on the speedometer are the same.

HINT: the vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

2 INSPECT RADIO RECEIVER

INSPECT RADIO RECEIVER

  1. Disconnect the radio receiver connector.
  2.  Measure the voltage.
  1.  Jack up either one of the drive wheels.
  2.  Move the shift lever to the neutral position.
  3.  Turn the ignition switch to the ON position.

*1: 6 Speaker without Rear Seat Entertainment System.

*2: 6 Speaker with Rear Seat Entertainment System.

INSPECT RADIO RECEIVER

  1. Measure the voltage between terminal SPD of the radio receiver and body ground when the drive wheels are turned slowly.

OK: Voltage pulses as shown in the illustration.

3 CHECK HARNESS AND CONNECTOR (COMBINATION METER - RADIO RECEIVER)

 CHECK HARNESS AND CONNECTOR (COMBINATION METER - RADIO RECEIVER)

  1. Disconnect the radio receiver connector and combination meter connector.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

*1: 6 Speaker without Rear Seat Entertainment System.

*2: 6 Speaker with Rear Seat Entertainment System.

4 CHECK HARNESS AND CONNECTOR

CHECK HARNESS AND CONNECTOR

  1. Disconnect the radio receiver connector and combination meter connector.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

HINT: If the resistance between terminal SPD and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.

*1: 6 Speaker without Rear Seat Entertainment System.

*2: 6 Speaker with Rear Seat Entertainment System.

REPLACE COMBINATION METER

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