Toyota Sienna Quiz
Navigation

Vehicle Speed Signal Circuit between Radio and Navigation Assembly and Combination Meter

In this manual: Navigation
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
10steps
~60min
3/5difficulty
Done 0 of 10

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:

  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
  • If a short occurs in an ECU, all systems in the diagram below will not operate normally.

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.
  3. Jack up either one of the drive wheels.
  4. Move the shift lever to the neutral position.
  5. Turn the ignition switch to the ON position
    INSPECT RADIO AND NAVIGATION ASSEMBLY
  6. 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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