Vehicle Speed Signal Circuit between Navigation ECU and Multi-Display: Procedure

1. Enter the "Display Check Mode (Vehicle Signal Check)" . Refer to DISPLAY CHECK MODE .
   Fig 1: Identifying Display Check Mode Menu "Speed" Indicator

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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.

NG → GO TO "VEHICLE SPEED SIGNAL CIRCUIT BETWEEN MULTI-DISPLAY AND COMBINATION METER" 

OK: Go to next step 

1. Disconnect the navigation ECU connector p2.
   Fig 2: Identifying Navigation ECU Connector p2

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2. Measure voltage.
   1. Jack up either one of the drive wheels.
   2. Move the shift lever to the neutral position.
   3. Turn the engine switch on (IG).
   4. Measure the voltage between terminal SPD of the navigation ECU and body ground when the drive wheels are turned slowly.
      Fig 3: Identifying Voltage Pulse

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      OK

      Voltage pulses as shown in the illustration.

OK → REPLACE NAVIGATION ECU 

NG: Go to next step 

1. Disconnect the multi-display connector p1 and navigation ECU connector p2.
   Fig 4: Identifying Multi-Display Connector P1 And Navigation ECU Connector P2

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2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   SPD - SPD	Always	Below 1 Ω
   SPD - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MULTI-DISPLAY