Microphone Circuit Between Microphone and Navigation Receiver Assembly

NAVIGATION SYSTEM (for Double Cab): Microphone Circuit between Microphone and Navigation Receiver Assembly

Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

This circuit sends a microphone signal from the microphone to the navigation receiver.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK NAVIGATION RECEIVER





(a) Check that waveform of the microphone using an oscilloscope.
OK:
Waveform that matches sound spoken into microphone is output.









C -- REPLACE NAVIGATION RECEIVER
B -- REPLACE NAVIGATION RECEIVER
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - ROOF CONSOLE BOX)





(a) Disconnect the K7 receiver connector.
(b) Disconnect the W7 console 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.
3. CHECK NAVIGATION RECEIVER (MACC VOLTAGE)





(a) Reconnect the K7 receiver connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





Result





C -- REPLACE NAVIGATION RECEIVER
B -- REPLACE NAVIGATION RECEIVER
A -- Continue to next step.
4. REPLACE MICROPHONE AMPLIFIER WITH ANOTHER AND CHECK
(a) Replace the microphone amplifier with a normal one (Removal).
(b) Check if the same problem occurs again.
OK:
Malfunction disappears
NG -- REPLACE ROOF CONSOLE BOX ASSEMBLY
OK -- END (MICROPHONE AMPLIFIER IS FAULTY)