Microphone Circuit between Microphone and Radio Receiver (To 8/2009): Procedure

1. Disconnect the radio receiver assembly connector.
   Fig 1: Disconnect The Radio Receiver Assembly Connector

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2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G10-3 (MACC) - Body ground	Engine switch on (IG)	4 to 6 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Radio Receiver Assembly)

NG → See step   4 

OK: Go to next step 

1. Disconnect the telephone microphone assembly and radio receiver assembly connectors.
   Fig 2: Identifying Telephone Microphone Assembly And Radio Receiver Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Measure The Resistance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   T10-36 (SNS2) - G10-1 (SNS2)	Always	Below 1 Ω
   T10-34 (MCO+) - G10-2 (MIN+)	Always	Below 1 Ω
   T10-35 (MCO-) - G10-5 (MIN-)	Always	Below 1 Ω
   T10-33 (MACC) - G10-3 (MACC)	Always	Below 1 Ω
   T10-36 (SNS2) - Body ground	Always	10 kΩ or higher
   T10-34 (MCO+) - Body ground	Always	10 kΩ or higher
   T10-35 (MCO-) - Body ground	Always	10 kΩ or higher
   T10-33 (MACC) - Body ground	Always	10 kΩ or higher
   G10-6 (SGND) - Body ground	Always	10 kΩ or higher

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   *1	Front view of wire harness connector (to Radio Receiver Assembly)
   *2	Front view of wire harness connector (to Telephone Microphone Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3