NAVIGATION SYSTEM (for Radio and Display Type) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION


WIRING DIAGRAM

A01J8U2E04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))


    1. Disconnect the radio and display receiver assembly connector.

    2. Disconnect the map light assembly (telephone microphone assembly) connector.

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

      Standard Resistance
      w/o Sliding Roof
      Tester Connection Condition Specified Condition
      L149-6 (SNS2) - U3-2 (SNS2) Always Below 1 Ω
      L149-4 (MACC) - U3-5 (MACC) Always Below 1 Ω
      L149-5 (MIN+) - U3-4 (MCO+) Always Below 1 Ω
      L149-19 (MIN-) - U3-3 (MCO-) Always Below 1 Ω
      L149-6 (SNS2) - Body ground Always 10 kΩ or higher
      L149-4 (MACC) - Body ground Always 10 kΩ or higher
      L149-5 (MIN+) - Body ground Always 10 kΩ or higher
      L149-19 (MIN-) - Body ground Always 10 kΩ or higher
      L149-18 (SGND) - Body ground Always 10 kΩ or higher
      w/ Sliding Roof
      Tester Connection Condition Specified Condition
      L149-6 (SNS2) - U13-3 (SNS2) Always Below 1 Ω
      L149-4 (MACC) - U13-6 (MACC) Always Below 1 Ω
      L149-5 (MIN+) - U13-5 (MCO+) Always Below 1 Ω
      L149-19 (MIN-) - U13-4 (MCO-) Always Below 1 Ω
      L149-6 (SNS2) - Body ground Always 10 kΩ or higher
      L149-4 (MACC) - Body ground Always 10 kΩ or higher
      L149-5 (MIN+) - Body ground Always 10 kΩ or higher
      L149-19 (MIN-) - Body ground Always 10 kΩ or higher
      L149-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Reconnect the radio and display receiver assembly connector.

    2. Reconnect the map light assembly (telephone microphone assembly) connector.

    3. A01JD1PE09
      Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L149-4 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L149-18 (SGND) - Body ground Always Below 1 Ω
      L149-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the map light assembly (telephone microphone assembly) connector.

    2. A01JBSTE01
      Text in Illustration
      *A w/o Sliding Roof
      *B w/ Sliding Roof
      *a

      Component without harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

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

      Standard Resistance
      w/o Sliding Roof
      Tester Connection Condition Specified Condition
      U3-2 (SNS2) - U3-3 (MCO-) Always Below 1 Ω
      w/ Sliding Roof
      Tester Connection Condition Specified Condition
      U13-3 (SNS2) - U13-4 (MCO-) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Reconnect the radio and display receiver assembly connector.

    2. Reconnect the map light assembly (telephone microphone assembly) connector.

    3. Turn the power switch on (ACC).

    4. Connect an oscilloscope to terminals 4 (MCO+) and 3 (MCO-) of the map light assembly (telephone microphone assembly) connector (w/o Sliding Roof).

    5. A01JB6JE01
      Text in Illustration
      *A w/o Sliding Roof
      *B w/ Sliding Roof
      *a

      Component with harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

      Connect an oscilloscope to terminals 5 (MCO+) and 4 (MCO-) of the map light assembly (telephone microphone assembly) connector (w/ Sliding Roof).

    6. 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 (telephone microphone assembly) is output A
      A waveform synchronized with the voice input to the map light assembly (telephone microphone 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 (w/o Sliding Roof) Click here.

    2. Replace the telephone microphone assembly (w/ Sliding Roof) Click here.

    3. 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