Inspection Procedure

1. Check that waveform of the microphone using an oscilloscope.

   OK: Waveform that matches sound spoken into microphone is output. 

   NAVIGATION RECEIVER TESTER CONNECTION SPECIFIED CONDITION
   
   

   Item	Content
   Tester Connection	K7-19 (MIC+) - K7-20 (MIC-)
   Tool Setting	0.2 V/DIV., 0.2 μsec./DIV.
   Condition	Ignition switch ACC and steering pad switch's "Voice" switch is pressed

   Fig 1: Identifying K7 Navigation Receiver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result 

   NAVIGATION RECEIVER RESULT CHART
   
   

   Result	Proceed to
   OK	A
   NG (for Column Shift Type)	B
   NG (for Floor Shift Type)	C

B: REPLACE NAVIGATION RECEIVER  (see REMOVAL  (For Column Shift Type) )

C: REPLACE NAVIGATION RECEIVER  (see REMOVAL  (For Floor Shift Type) )

A: Go to Next Step 

1. Disconnect the K7 receiver connector.
2. Disconnect the W7 console connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   HARNESS AND CONNECTOR (NAVIGATION RECEIVER - ROOF CONSOLE BOX) TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   K7-17 (MACC) - W7-10 (ACC)	Always	Below 1 Ω
   K7-19 (MIC+) - W7-9 (MI1+)
   K7-20 (MIC-) - W7-8 (MIC-)
   K7-17 (MACC) - Body ground	Always	10 kΩ or higher
   K7-19 (MIC+) - Body ground
   K7-20 (MIC-) - Body ground

   Fig 2: Identifying K7 Receiver Connector And W7 Console Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Reconnect the K7 receiver connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   NAVIGATION RECEIVER (MACC VOLTAGE) TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   K7-17 (MACC) - Body ground	Ignition switch ACC	4 to 6V

   Fig 3: Identifying K7 Receiver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result 

   NAVIGATION RECEIVER (MACC VOLTAGE) RESULT CHART
   
   

   Result	Proceed to
   OK	A
   NG (for Column Shift Type)	B
   NG (for Floor Shift Type)	C

B: REPLACE NAVIGATION RECEIVER  (see REMOVAL  (For Column Shift Type) )

C: REPLACE NAVIGATION RECEIVER  (see REMOVAL  (For Floor Shift Type) )

A: Go to Next Step 

1. Replace the microphone amplifier with a normal one (see REMOVAL ).
2. Check if the same problem occurs again.

   OK: Malfunction disappears 

NG: REPLACE MICROPHONE AMPLIFIER ASSEMBLY  (See REMOVAL )

OK: END (MICROPHONE AMPLIFIER IS FAULTY)