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

DESCRIPTION

This circuit sends a microphone signal from the telephone microphone assembly to the radio and display receiver assembly.

It also supplies power from the radio and display receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

A01QPSGE04

CAUTION / NOTICE / HINT

Note

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

Click here

PROCEDURE


  1. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01QTMEC12
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G143-19 (MIN-) - Body ground Always Below 1 Ω
      G143-18 (SGND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G143-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the G143 radio and display receiver assembly connector.

    2. Disconnect the Q16 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G143-4 (MACC) - Q16-3 (MACC) Always Below 1 Ω
      G143-5 (MIN+) - Q16-4 (MCO+) Always Below 1 Ω
      G143-19 (MIN-) - Q16-6 (MCO-) Always Below 1 Ω
      G143-6 (SNS2) - Q16-5 (SNS2) Always Below 1 Ω
      G143-4 (MACC) - Body ground Always 10 kΩ or higher
      G143-5 (MIN+) - Body ground Always 10 kΩ or higher
      G143-19 (MIN-) - Body ground Always 10 kΩ or higher
      G143-18 (SGND) - Body ground Always 10 kΩ or higher
      G143-6 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a known good one.

      Click here

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here