Inspection Procedure

1. Enter the "Display Check Mode (Vehicle Signal Check Mode)" (See OPERATION CHECK  ).
2. While driving, compare the "SPEED" indicator to the reading on the speedometer Check if these readings are almost the same

   OK: The readings are almost the same. 

   Fig 1: Diagnosis Display Screen - Vehicle Signal Check Mode

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO  "VEHICLE SPEED SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND COMBINATION METER " (See )

OK: Go to Next Step 

1. Disconnect the navigation ECU connector
2. Measure voltage
   1. Jack up either one of the drive wheels
   2. Move the shift lever to N
   3. Turn the engine switch on (IG)
      Fig 2: Identifying Terminals Of Navigation ECU Connector

      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

      OK: Voltage pulses as shown in the illustration. 

Fig 3: Identifying Voltage Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 3 

OK: REPLACE NAVIGATION ECU  (See REMOVAL  )

1. Disconnect the multi-display connector and navigation ECU connector
   Fig 4: Identifying Terminals Of Multi-Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   p1-16 (SPD2) - p2-4 (SPD)	Always	Below 1 Ω
   p1-16 (SPD2) - Body ground	Always	10 kΩ or higher

Fig 5: Identifying Terminals Of Navigation ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MULTI-DISPLAY  (See REMOVAL  )