Microphone Circuit between Microphone and Radio Receiver: Procedure

1. Choose the model to be inspected.

   Result

   Model	Proceed to
   w/o Manual (SOS) Switch	A
   w/ Manual (SOS) Switch	B

B → See step   4 

A: Go to next step 

1. Disconnect the radio receiver assembly and map light assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F68-1 (SNS2) - P10-5 (SNS2)	Always	Below 1 Ω
   F68-3 (MACC) - P10-2 (ACC)	Always	Below 1 Ω
   F68-2 (MIN+) - P10-3 (MIC+)	Always	Below 1 Ω
   F68-5 (MIN-) - P10-4 (MIC-)	Always	Below 1 Ω
   F68-1 (SNS2) - Body ground	Always	10 kΩ or higher
   F68-3 (MACC) - Body ground	Always	10 kΩ or higher
   F68-2 (MIN+) - Body ground	Always	10 kΩ or higher
   F68-5 (MIN-) - Body ground	Always	10 kΩ or higher
   F68-6 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the radio receiver assembly connector.
   Fig 1: Identifying F68 Radio Receiver Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F68-3 (MACC) - Body ground	Power switch on (ACC)	4 to 6 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F68-6 (SGND) - Body ground	Always	Below 1 Ω
   F68-5 (MIN-) - Body ground	Always	Below 1 Ω

4. Proceed to the next step based on the inspection result.

   Result

   Result	Proceed to
   NG	A
   OK	B

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Radio Receiver Assembly)

B → See step   9 

A → See step   12 

1. Disconnect the radio receiver assembly and map light assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F68-1 (SNS2) - P10-5 (SNS2)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the radio receiver assembly and DCM (telematics transceiver) connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F68-2 (MIN+) - F38-18 (MCO+)	Always	Below 1 Ω
   F68-5 (MIN-) - F38-19 (MCO-)	Always	Below 1 Ω
   F68-2 (MIN+) - Body ground	Always	10 kΩ or higher
   F68-5 (MIN-) - Body ground	Always	10 kΩ or higher
   F68-6 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the DCM (telematics transceiver) and map light assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F38-33 (MCVD) - P10-2 (ACC)	Always	Below 1 Ω
   F38-34 (MCI+) - P10-3 (MIC+)	Always	Below 1 Ω
   F38-35 (MCI-) - P10-4 (MIC-)	Always	Below 1 Ω
   F38-33 (MCVD) - Body ground	Always	10 kΩ or higher
   F38-34 (MCI+) - Body ground	Always	10 kΩ or higher
   F38-35 (MCI-) - Body ground	Always	10 kΩ or higher
   F38-32 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the radio receiver assembly connector.
   Fig 2: Identifying F68 Radio Receiver Assembly 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
   F68-6 (SGND) - Body ground	Always	Below 1 Ω
   F68-5 (MIN-) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Radio Receiver Assembly)

NG → See step   15 

OK: Go to next step 

1. Reconnect the DCM (telematics transceiver) connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 3: Identifying F38 DCM (Telematics Transceiver) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F38-33 (MCVD) - Body ground	Power switch on (ACC)	4 to 6 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (DCM (Telematics Transceiver))

NG → See step   16 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 4: Identifying P10 Map Light Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P10-4 (MIC-) - P10-5 (SNS2)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Map Light Assembly)

NG → See step   11 

OK: Go to next step 

1. Reconnect the radio receiver assembly connector.
2. Reconnect the DCM (telematics transceiver) connector (w/ Manual (SOS) Switch).
3. Reconnect the map light assembly connector.
   Fig 5: Identifying P10 Map Light Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Turn the power switch on (ACC).
5. Connect an oscilloscope to terminals 3 (MIC+) and 4 (MIC-) of the P10 map light assembly connector.
6. Check the waveform of the telephone microphone assembly using the oscilloscope.

   Result

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

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Map Light Assembly)

B → See step   11 

A → See step   14 

1. Replace the telephone microphone assembly. Refer to REMOVAL .
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   13 

A → END