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

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: Identifying N13 Navigation ECU Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Measure the voltage between terminal SPD of the wire harness connector and body ground when the drive wheels are turned slowly.

      OK: Voltage pulses as shown in the illustration. 

   Fig 2: Terminal Voltage Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester connection	Condition	Specified condition
   SPD - C8-6	Ignition switch off	Below 1 Ω

Fig 3: Identifying N3 And C8 Connector Terminals
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.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

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

   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.

   Fig 4: Identifying N3 Navigation ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU 

OK: REPLACE COMBINATION METER