Microphone Circuit between Microphone and Radio Receiver [08/2015 - ]: Procedure

1. Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check. Refer to OPERATION CHECK [08/2015 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

   OK

   Check result is normal.

NG → See step   2 

OK → See step   7 

1. Disconnect the I67 radio and display receiver assembly connector.
2. Disconnect the S12 roof console box assembly (telephone microphone assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I67-4 (MACC) - S12-14 (MACC)	Always	Below 1 Ω
   I67-5 (MIN+) - S12-13 (MCO+)	Always	Below 1 Ω
   I67-19 (MIN-) - S12-12 (MCO-)	Always	Below 1 Ω
   I67-6 (SNS2) - S12-15 (SNS2)	Always	Below 1 Ω
   I67-4 (MACC) - Body ground	Always	10 kΩ or higher
   I67-5 (MIN+) - Body ground	Always	10 kΩ or higher
   I67-19 (MIN-) - Body ground	Always	10 kΩ or higher
   I67-18 (SGND) - Body ground	Always	10 kΩ or higher
   I67-6 (SNS2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I67-4 (MACC) - Body ground	Ignition switch ACC	4 to 6 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I67-18 (SGND) - Body ground	Always	Below 1 Ω
   I67-19 (MIN-) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Radio and Display Receiver Assembly)

NG → See step   7 

OK: Go to next step 

1. Remove the roof console box assembly (telephone microphone assembly). Refer to REMOVAL [08/2015 - ] .
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   15 (SNS2) - 12 (MCO-)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Roof Console Box Assembly (Telephone Microphone Assembly))

NG → See step   8 

OK: Go to next step 

1. Turn the ignition switch to ACC.
2. Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the S12 roof console box assembly (telephone microphone assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

3. Check the waveform of the roof console box assembly (telephone microphone assembly) using the oscilloscope.

   Result

   Result	Proceed to
   A waveform synchronized with the voice input to the roof console box assembly (telephone microphone assembly) is output.	A
   A waveform synchronized with the voice input to the roof console box assembly (telephone microphone assembly) is not output.	B

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Roof Console Box Assembly (Telephone Microphone Assembly))

B → See step   8 

A → See step   6