NAVIGATION SYSTEM (for DVD) > Microphone Circuit between Microphone and Navigation ECU

for Preparation Click here


DESCRIPTION

  1. The display and navigation module display and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
  2. Using this circuit, the display and navigation module display sends power to the map light assembly (telephone microphone assembly), and the map light assembly sends microphone signals to the display and navigation module display.

WIRING DIAGRAM


E176570E33


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H60 display and navigation module display connector.

  1. Disconnect the T6 map light assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-20 (SNS2) - T6-11 (SNS2)
    		Always
    		Below 1 Ω
    H60-4 (MACC) - T6-14 (MACC)
    		Always
    		Below 1 Ω
    H60-5 (MIN+) - T6-13 (MCO+)
    		Always
    		Below 1 Ω
    H60-6 (MIN-) - T6-12 (MCO-)
    		Always
    		Below 1 Ω
    H60-20 (SNS2) - Body ground
    		Always
    		10 kΩ or higher
    H60-4 (MACC) - Body ground
    		Always
    		10 kΩ or higher
    H60-5 (MIN+) - Body ground
    		Always
    		10 kΩ or higher
    H60-6 (MIN-) - Body ground
    		Always
    		10 kΩ or higher
    H60-7 (SGND) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY

  1. Reconnect the H60 display and navigation module display connector.

  1. Reconnect the T6 map light assembly connector.



    E176670E67

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H60-4 (MACC) - Body ground
    		Power switch on (ACC)
    		4 to 6 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-7 (SGND) - Body ground
    		Always
    		Below 1 Ω
    H60-6 (MIN-) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Component with harness connected
    (Display and Navigation Module Display)



NG
REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (Click here)
OK


3.INSPECT MAP LIGHT ASSEMBLY

  1. Disconnect the T6 map light assembly connector.



    E221758E01

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

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

    Text in Illustration 
    *a
    		Component without harness connected
    (Map Light Assembly)



NG
Go to step 5
OK


4.INSPECT MAP LIGHT ASSEMBLY

  1. Reconnect the H60 display and navigation module display connector.



    E210272E01

  1. Reconnect the T6 map light assembly connector.

  1. Turn the power switch on (ACC).

  1. Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the T6 map light assembly connector.

  1. 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

    Text in Illustration 
    *a
    		Component with harness connected
    (Map Light Assembly)



B
Go to step 5
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).

  1. 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