Toyota RAV4 manuals

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

Toyota Sienna Service Manual / Navigation / Navigation system / Diagnostic trouble code chart / Vehicle Speed Signal Circuit between Radio and Navigation Assembly and Combination Meter

DESCRIPTION The radio and navigation assembly receives a vehicle speed signal from the combination meter and information about the GPS antenna, and then adjusts vehicle position.

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 AND NAVIGATION ASSEMBLY

INSPECT RADIO AND NAVIGATION ASSEMBLY

  1. Disconnect the radio and navigation assembly connector R12.
  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

INSPECT RADIO AND NAVIGATION ASSEMBLY

  1. Measure the voltage between terminal SPD of the radio and navigation assembly 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 AND NAVIGATION ASSEMBLY)

 CHECK HARNESS AND CONNECTOR

  1. Disconnect the radio and navigation assembly connector R12 and combination meter connector C10.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

4 CHECK HARNESS AND CONNECTOR (COMBINATION METER - RADIO AND NAVIGATION ASSEMBLY)

CHECK HARNESS AND CONNECTOR

  1. Disconnect the radio and navigation assembly connector R12 and combination meter connector C10.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

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.

REPLACE COMBINATION METER

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