Microphone Circuit between Microphone and Navigation Receiver Assembly [09/2013 - ]: Procedure

1. Disconnect the E119 navigation receiver assembly connector.
2. Disconnect the E122 DCM (telematics transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E119-5 (MIN+) - E122-18 (MCO+)	Always	Below 1 Ω
   E119-19 (MIN-) - E122-19 (MCO-)	Always	Below 1 Ω
   E119-5 (MIN+) - Body ground	Always	10 kΩ or higher
   E119-19 (MIN-) - Body ground	Always	10 kΩ or higher
   E119-18 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E122 DCM (telematics transceiver) connector.
2. Disconnect the P5 map light 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
   E122-33 (MCVD) - P5-12 (ACC)	Always	Below 1 Ω
   E122-34 (MCI+) - P5-10 (MIC+)	Always	Below 1 Ω
   E122-35 (MCI-) - P5-9 (MIC-)	Always	Below 1 Ω
   E122-33 (MCVD) - Body ground	Always	10 kΩ or higher
   E122-34 (MCI+) - Body ground	Always	10 kΩ or higher
   E122-35 (MCI-) - Body ground	Always	10 kΩ or higher
   E122-32 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E122 DCM (telematics transceiver) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E119-18 (SGND) - Body ground	Always	Below 1 Ω
   E119-19 (MIN-) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Navigation Receiver Assembly)

NG → See step   7 

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	Switch Condition	Specified Condition
   E122-33 (MCVD) - Body ground	Power switch on (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
   E122-35 (MCI-) - Body ground	Always	Below 1 Ω
   E122-32 (SGND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (DCM [Telematics Transceiver])

NG → See step   9 

OK: Go to next step 

1. Turn the power switch on (ACC).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect an oscilloscope to terminals 10 (MIC+) and 9 (MIC-) of the map light assembly (telephone microphone assembly) connector.
3. Check the waveform of the telephone microphone assembly using the oscilloscope.
   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Map Light Assembly [Telephone Microphone Assembly])

   RESULT
   
   

   Result	Proceed to
   A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output	A
   A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output	B

B → See step   6 

A → See step   8 

1. Replace the telephone microphone assembly. Refer to REMOVAL [09/2013 - ] .
2. Check if the same malfunction recurs.
   RESULT
   
   

   Result	Proceed to
   Malfunction does not recur (returns to normal)	A
   Malfunction recurs	B

B → See step   10 

A → END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)