AUDIO AND VISUAL SYSTEM(w/o Parking Assist Monitor System) Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

Click here

DESCRIPTION

• for Automatic Sound Levelizer (ASL) (for 6 Speakers):

• This circuit is necessary for the Automatic Sound Levelizer (ASL) built into the radio receiver assembly.

  The Automatic Sound Levelizer (ASL) function automatically adjusts the audio system volume level in order to compensate for increased vehicle noise (vehicle noise tends to increase as vehicle speed increases). The ASL adjusts the volume level based upon vehicle speed signals that it receives from the combination meter assembly.

• for "Bluetooth":

• Vehicle speed signals are received from the combination meter assembly and used to cancel "Bluetooth" function operation.

  The radio receiver assembly recognizes that the vehicle is being driven and makes it impossible to connect or register a "Bluetooth" device while driving.

• for Video Compact Disc (VCD) or Digital Versatile Disc (DVD):

• The radio receiver assembly receives a vehicle speed signal from the combination meter assembly for VCD or DVD viewing restriction while driving, etc.

Click here

PROCEDURE

1. Click here

   CHECK VEHICLE SIGNAL (OPERATION CHECK)

   
   
   1. 

      Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check.

      Click here

   2. While driving the vehicle, compare the value displayed for "SPEED" to the reading on the speedometer. Check if these readings are almost equal.

      Tip:

      The combination meter assembly receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following inspection referring to values on the Data List of the skid control ECU because it is the source of the vehicle speed signal.

      OK
      Vehicle speed displayed on the "Vehicle Signal Check Mode" screen is almost the same as the actual vehicle speed measured using the GTS.
      Click hereClick here

      Result
      Proceed to OK NG

   
   
   • OK

     PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

   • NGClick here
2. Click here

   INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

   
   
   1. 

      *a

      Component with harness connected (Combination Meter Assembly)

      -

      -

      Check the output waveform.

      
      

      1. Remove the combination meter assembly with the connector still connected.

      2. Connect an oscilloscope to terminal O3-19 (+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	O3-19 (+S) - Body ground
         Tool setting	5 V/DIV., 20 ms./DIV.
         Vehicle condition	Wheel being rotated

         OK
         The waveform is similar to that shown in the illustration.

         Tip:

         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.

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     GO TO METER / GAUGE SYSTEMClick here

3. Click here

   INSPECT RADIO RECEIVER ASSEMBLY (INPUT WAVEFORM)

   
   
   1. 

      *a

      Component with harness connected (Radio Receiver Assembly)

      -

      -

      Check the input waveform.

      
      

      1. Remove the radio receiver assembly with the connector still connected.

      2. Connect an oscilloscope to terminal O70-17 (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.

         Item	Condition
         Measurement terminal	O70-17 (SPD) - Body ground
         Tool setting	5 V/DIV., 20 ms./DIV.
         Vehicle condition	Wheel being rotated

         OK
         The waveform is similar to that shown in the illustration.

         Tip:

         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.

      Result
      Proceed to OK NG

   
   
   • OK

     REPLACE RADIO RECEIVER ASSEMBLYClick here

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)