DTC B15C2: Speed Signal Malfunction: Procedure

1. Enter the "Check GPS & Vehicle Sensor" (Vehicle Sensors). Refer to OPERATION CHECK .
   Fig 1: Screen Display - GPS & Vehicle Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. While driving the vehicle, compare the "Speed" indicator to the reading on the speedometer. Check if these readings are almost equal.

   OK

   The readings are almost equal.

NG → See step   2 

OK → See step   5 

1. Check the output waveform.
   Fig 2: F15 Connector And Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the combination meter assembly with the connector(s) still connected.
   2. Connect an oscilloscope to terminal F15-3 (+S) and body ground.
   3. Turn the engine switch on (IG).
   4. Turn a wheel slowly.
   5. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Measurement terminal	F15-3 (+S) - Body ground
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle condition	Wheel being rotated

      TEXT IN ILLUSTRATION
      
      

      *1	Component with harness connected (Combination Meter Assembly)

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

NG → See step   6 

OK: Go to next step 

1. Disconnect the display and navigation module display connector.
   Fig 3: Display And Navigation Module Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the combination meter assembly connector.
   Fig 4: Combination Meter Assembly Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G4-18 (SPD) - F15-3 (+S)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)
   *2	Front view of wire harness connector (to Combination Meter Assembly)

NG → See step   4 

OK → See step   7 

1. Disconnect the display and navigation module display connector.
   Fig 5: Display And Navigation Module Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the junction block connector.
   Fig 6: Junction Block Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G4-18 (SPD) - F93-47	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)
   *2	Front view of wire harness connector (to Junction Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - JUNCTION BLOCK) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (JUNCTION BLOCK)