Microphone Circuit between Overhead J/B and Multi-display

NAVIGATION: NAVIGATION SYSTEM (for HDD): Microphone Circuit between Overhead J/B and Multi-display

Microphone Circuit between Overhead J/B and Multi-display

DESCRIPTION

W/O LEXUS Link System:
This circuit sends a microphone signal from the microphone to the display and navigation assembly. It also supplies power from the display and navigation assembly to the microphone.
W/ LEXUS Link System:
This circuit sends a microphone signal from the microphone to the display and navigation assembly through the mayday ECU. It also supplies power from the mayday ECU to the microphone.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK DISPLAY AND NAVIGATION ASSEMBLY




(a) Check the waveform of the microphone using an oscilloscope.






OK:
Waveform the matches sound spoken into microphone is output.
NG -- CHECK LEXUS LINK SYSTEM
OK -- REPLACE DISPLAY AND NAVIGATION ASSEMBLY
2. CHECK LEXUS LINK SYSTEM
(a) Check if the vehicle is equipped with the LEXUS link system.

Result





B -- CHECK HARNESS AND CONNECTOR (MAYDAY ECU - DISPLAY AND NAVIGATION ASSEMBLY AND MICROPHONE)
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - DISPLAY AND NAVIGATION ASSEMBLY)




(a) Disconnect the X4 junction block connector.
(b) Disconnect the L60 display connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK DISPLAY AND NAVIGATION ASSEMBLY (MACC VOLTAGE)




(a) Reconnect the L60 display connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE DISPLAY AND NAVIGATION ASSEMBLY
OK -- Continue to next step.

5. CHECK MICROPHONE ASSEMBLY




(a) Remove the microphone from the overhead junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE MICROPHONE ASSEMBLY
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
6. CHECK HARNESS AND CONNECTOR (MAYDAY ECU - DISPLAY AND NAVIGATION ASSEMBLY AND MICROPHONE)




(a) Disconnect the R24 ECU connector.
(b) Disconnect the L60 display connector.
(c) Disconnect the X4 microphone connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK MAYDAY ECU (TACC VOLTAGE)




(a) Reconnect the R24 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE MAYDAY ECU
OK -- Continue to next step.

8. CHECK MICROPHONE ASSEMBLY




(a) Remove the microphone from the overhead junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE MICROPHONE ASSEMBLY
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE