DESCRIPTION
This circuit sends a microphone signal from the telephone microphone assembly to the display and navigation module display.
It also supplies power from the display and navigation module display to the telephone microphone assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
CHECK DISPLAY AND NAVIGATION MODULE DISPLAY
*a | Component without harness connected (Display and Navigation Module Display) |
Disconnect the H4 display and navigation module display connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here |
OK |
CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - MAP LIGHT)
Disconnect the H4 display and navigation module display connector.
Disconnect the W7 map light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT MAP LIGHT ASSEMBLY
Remove the map light assembly Click here.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE TELEPHONE MICROPHONE WITH ANOTHER CHECK Click here |
OK |
CHECK MAP LIGHT ASSEMBLY
*a | Component with harness connected (Map Light Assembly) |
Connect an oscilloscope to terminals W7-12 (MCO+) and W7-13 (MCO-) of the map light assembly connector.
Check the waveform of the telephone microphone assembly using an oscilloscope.
Result | Proceed to |
---|---|
Waveform synchronized with voice input to telephone microphone assembly is output | A |
Waveform synchronized with voice input to telephone microphone assembly is not output | B |
B |
REPLACE TELEPHONE MICROPHONE WITH ANOTHER CHECK Click here |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here
REPLACE TELEPHONE MICROPHONE WITH ANOTHER CHECK
Replace the telephone microphone assembly with a normal one Click here.
Check if the same problem occurs again.
OK |
---|
Malfunction disappears. |
NG |
REPLACE MAP LIGHT ASSEMBLY |
OK |
END (TELEPHONE MICROPHONE IS FAULTY)