DTC B15C2: Speed Signal Malfunction: Procedure

1. Enter the "Vehicle Sensors" screen. Refer to Check GPS & Vehicle Sensors in Operation Check . Refer to OPERATION CHECK .
   Fig 1: Identifying GPS And Vehicle Sensor Screen Display

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. While driving the vehicle, compare the "SPD" 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   4 

1. Disconnect the J100 display and navigation module display connector.
2. Disconnect the J34 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J100-18 (SPD) - J34-5 (+S)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the J34 combination meter assembly.
   Fig 2: Identifying Display And Navigation Module Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Check the output waveform.
   2. Connect an oscilloscope to terminal J100-18 (SPD) 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.
      Fig 3: Identifying Waveform

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Condition
      Measurement terminal	J100-18 (SPD) - Body ground
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle condition	Wheel being rotated

      TEXT IN ILLUSTRATION
      
      

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

      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   5 

OK → See step   4