NAVIGATION SYSTEM Microphone Circuit between Microphone and Radio Receiver

DTC Code DTC Name
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

E291289E05

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. U124075E02

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-19 (MIN-) - Body ground

      Always

      Below 1 Ω

      H105-18 (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

      H105-4 (MACC) - Body ground

      Ignition switch ACC

      4 to 6 V
      Table 1. Text in Illustration

      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY)

    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Disconnect the Q10 roof console box assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-4 (MACC) - Q10-15 (MACC)

      Always

      Below 1 Ω

      H105-5 (MIN+) - Q10-14 (MIC+)

      Always

      Below 1 Ω

      H105-19 (MIN-) - Q10-13 (MIC-)

      Always

      Below 1 Ω

      H105-6 (SNS2) - Q10-4 (SNS2)

      Always

      Below 1 Ω

      H105-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      H105-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      H105-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      H105-18 (SGND) - Body ground

      Always

      10 kΩ or higher

      H105-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK 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.

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    REPLACE MAP LIGHT ASSEMBLY

    (Click here)