AUDIO AND VISUAL SYSTEM (w/o Navigation System) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

Using this circuit, the radio receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

A003ZK2E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR


    1. Disconnect the radio receiver assembly and map light assembly connectors.

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

      Standard Resistance
      for 10 Speakers
      Tester Connection Condition Specified Condition
      H54-1 (SNS2) - T6-11 (SNS2) Always Below 1 Ω
      H54-3 (MACC) - T6-14 (MACC) Always Below 1 Ω
      H54-2 (MIN+) - T6-13 (MCO+) Always Below 1 Ω
      H54-5 (MIN-) - T6-12 (MCO-) Always Below 1 Ω
      H54-1 (SNS2) - Body ground Always 10 kΩ or higher
      H54-3 (MACC) - Body ground Always 10 kΩ or higher
      H54-2 (MIN+) - Body ground Always 10 kΩ or higher
      H54-5 (MIN-) - Body ground Always 10 kΩ or higher
      H54-6 (SGND) - Body ground Always 10 kΩ or higher
      for 6 Speakers
      Tester Connection Condition Specified Condition
      H47-6 (SNS2) - T6-11 (SNS2) Always Below 1 Ω
      H47-4 (MACC) - T6-14 (MACC) Always Below 1 Ω
      H47-5 (MIN+) - T6-13 (MCO+) Always Below 1 Ω
      H47-19 (MIN-) - T6-12 (MCO-) Always Below 1 Ω
      H47-6 (SNS2) - Body ground Always 10 kΩ or higher
      H47-4 (MACC) - Body ground Always 10 kΩ or higher
      H47-5 (MIN+) - Body ground Always 10 kΩ or higher
      H47-19 (MIN-) - Body ground Always 10 kΩ or higher
      H47-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO RECEIVER ASSEMBLY


    1. Disconnect the radio receiver assembly connector.

    2. A003ZQJE01
      Text in Illustration
      *A for 10 Speakers
      *B for 6 Speakers
      *a

      Component without harness connected

      (Radio Receiver Assembly)

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

      Standard Voltage
      for 10 Speakers
      Tester Connection Condition Specified Condition
      H54-3 (MACC) - Body ground Power switch on (ACC) 4 to 6 V
      for 6 Speakers
      Tester Connection Condition Specified Condition
      H47-4 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      for 10 Speakers
      Tester Connection Condition Specified Condition
      H54-6 (SGND) - Body ground Always Below 1 Ω
      H54-5 (MIN-) - Body ground Always Below 1 Ω
      for 6 Speakers
      Tester Connection Condition Specified Condition
      H47-18 (SGND) - Body ground Always Below 1 Ω
      H47-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A003Y3XE11
      Text in Illustration
      *a

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T6-12 (MCO-) - T6-11 (SNS2) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. Reconnect the radio receiver assembly connector.

    2. A003W83E02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Reconnect the map light assembly connector.

    3. Turn the power switch on (ACC).

    4. Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the map light assembly connector.

    5. Check the waveform of the telephone microphone assembly using the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly is output A
      A waveform synchronized with the voice input to the map light assembly is not output B

    B

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  5. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly Click here.

    2. Check if the same malfunction recurs.

      Result
      Result Proceed to

      Malfunction does not recur

      (returns to normal)

      		 A
      Malfunction recurs B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END