R-12: Check The Microphone Input Condition

Courtesy of

Tester Connection	Condition	Specified Condition
CON-B10 ↔ MIC (+)	Always	Below 1Ω
CON-B22 ↔ MIC (-)	Always	Below 1Ω
CON-B22 ↔ GND	Always	Open

OK	Check the vehicle wiring and microphone

NG	Go to step 1 below

1. Test again after replacing the microphone