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

1. Enter the "Display Check Mode (Vehicle Signal Check Mode)". Refer to OPERATION CHECK .
   Fig 1: Diagnostic Tool Display - Display Check Mode

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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 → See step   5 

OK: Go to next step 

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

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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).
   4. Measure the voltage between terminal SPD of the navigation ECU and body ground when the drive wheels are turned slowly.
      Fig 3: View Of Voltage Pulses/Blinking Pattern

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      OK

      Voltage pulses as shown in the illustration.

NG → See step   3 

OK → See step   6 

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

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2. Measure the resistance according to the value(s) in the table below.
   Fig 5: Identifying Terminals Of Navigation ECU Connector

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   Standard Resistance

   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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4