Inspection Procedure

1. Drive the vehicle and check if the function of the speedometer in 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.

NG: GO TO COMBINATION METER SYSTEM

OK: Go to next step 

1. Disconnect the navigation ECU connector N3.
2. Measure 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.
      Fig 1: Disconnecting Navigation ECU Connector N3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Measure the voltage between terminal SPD of the navigation ECU and body ground when the drive wheels are turned slowly.
      Fig 2: View Of Voltage Pulses/Blinking Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Voltage pulses as shown in the illustration. 

OK: REPLACE NAVIGATION ECU 

NG: Go to next step 

1. Disconnect the navigation ECU connector N3 and combination meter connector C8.
2. Measure the resistance according to the value(s) in the table below.

Resistance 

Fig 3: Disconnecting Navigation ECU Connector N3 And Combination Meter Connector C8

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the navigation ECU connector N3 and combination meter connector C8.
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester connection	Condition	Specified Condition
   SPD - Body ground	Ignition switch OFF	10 kΩ or higher

   Fig 4: Disconnecting Navigation ECU Connector N3 And Combination Meter Connector C8

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 ECU.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU 

OK: REPLACE COMBINATION METER