Audio And Visual System Vehicle Speed Signal Circuit Between Radio Receiver And Combination Meter

Body Electrical. Camry. Acv40 Gsv40
Audio Visual. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER ASSEMBLY)

AUDIO AND VISUAL SYSTEM - Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter


DESCRIPTION

The circuit is necessary for the Automatic Sound Levelizer (ASL) built into the radio receiver.
Speed signals are received from the combination meter assembly and used for the ASL.
The ASL function automatically adjusts the sound volume in order to enable clear audio quality even when vehicle noise increases (as vehicle noise increases, the volume is turned up etc.).
HINT:
  1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.
  2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.

WIRING DIAGRAM


2AZ-FE:

Camry. Acv40 Gsv40.Audio Visual.Audio And Visual System.Audio And Visual System Vehicle Speed Signal Circuit Between Radio Receiver And Combination Meter


2GR-FE:

Camry. Acv40 Gsv40.Audio Visual.Audio And Visual System.Audio And Visual System Vehicle Speed Signal Circuit Between Radio Receiver And Combination Meter


INSPECTION PROCEDURE

1.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    Camry. Acv40 Gsv40.Audio Visual.Audio And Visual System.Audio And Visual System Vehicle Speed Signal Circuit Between Radio Receiver And Combination Meter

  1. Check the output waveform.

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

    2. Connect an oscilloscope to terminal F2-12 (+S) and body ground.

    3. Turn the ignition switch to ON.

    4. Turn the wheel slowly.

    5. Check the signal waveform according to the condition(s) in the table below.

      Item
      		Condition
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Vehicle condition
      		Driving at approx. 20 km/h (12 mph)
      OK:
      The waveform is displayed as 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.
      Text in Illustration
      *1
      		Component with harness connected
      (Combination Meter Assembly)


NG
GO TO METER / GAUGE SYSTEM (CAMRY_ACV40 RM000002UD701TX.html)
OK


2.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER ASSEMBLY)


    Camry. Acv40 Gsv40.Audio Visual.Audio And Visual System.Audio And Visual System Vehicle Speed Signal Circuit Between Radio Receiver And Combination Meter

  1. Disconnect the radio receiver and combination meter assembly connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F8-3 (SPD) - F2-12 (+S)
    		Always
    		Below 1 Ω
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Radio Receiver)
    *2
    		Front view of wire harness connector
    (to Combination Meter Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE RADIO RECEIVER (CAMRY_ACV40 RM0000026K1014X.html)