Microphone Circuit Between Microphone and Radio Receiver

AUDIO AND VISUAL SYSTEM (for Regular Cab and Double Cab): Microphone Circuit between Microphone and Radio Receiver

Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

This circuit sends a microphone signal from the microphone to the radio receiver.
It also supplies power from the radio receiver to the microphone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (TSW- - MGND)





(a) Disconnect the K9 receiver connector.
(b) 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.
2. CHECK HARNESS AND CONNECTOR (MICROPHONE - RADIO RECEIVER)





(a) Disconnect the W7 microphone connector.
(b) Disconnect the K9 receiver 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 RADIO RECEIVER (MCVD VOLTAGE)





(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:









C -- REPLACE RADIO RECEIVER
B -- REPLACE RADIO RECEIVER
A -- Continue to next step.
4. REPLACE MICROPHONE WITH ANOTHER AND CHECK
(a) Replace the microphone 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 IS FAULTY)