DTC B1579: Voice Recognition Microphone Disconnected [10/2014 - 10/2015]: Procedure

1. 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
   I8-19 (MIN-) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Navigation ECU Sub-assembly)

Result: 

NG 

REPLACE NAVIGATION ECU SUB-ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

OK 

See step  2

1. Choose the model to be inspected.

   Result

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

Result: 

B 

See step  7

Result: 

A 

See step  3

1. Disconnect the I135 DCM (telematics transceiver) connector.
2. Disconnect the S12 inner rear view mirror assembly (amplifier microphone assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I135-35 (MCI-) - S12-12 (MIC-)	Always	Below 1 Ω
   I135-35 (MCI-) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the I8 navigation ECU sub-assembly connector.
2. Disconnect the I135 DCM (telematics transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I8-19 (MIN-) - I135-19 (MCO-)	Always	Below 1 Ω
   I8-19 (MIN-) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the I8 navigation ECU sub-assembly connector.
2. Disconnect the S12 inner rear view mirror assembly (amplifier microphone assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I8-6 (SNS2) - S12-10 (SGND)	Always	Below 1 Ω
   I8-6 (SNS2) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. 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
   I135-35 (MCI-) - Body ground	Always	Below 1 Ω

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

   Result

   Result	Proceed to
   NG	A
   OK	B

   TEXT IN ILLUSTRATION
   
   

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

Result: 

A 

REPLACE DCM (TELEMATICS TRANSCEIVER) 

(Refer to REMOVAL [10/2014 - ] )

Result: 

B 

See step  8

1. Disconnect the I8 navigation ECU sub-assembly connector.
2. Disconnect the S12 inner rear view mirror assembly (amplifier microphone assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I8-6 (SNS2) - S12-10 (SGND)	Always	Below 1 Ω
   I8-19 (MIN-) - S12-12 (MIC-)	Always	Below 1 Ω
   I8-6 (SNS2) - Body ground	Always	10 kΩ or higher
   I8-19 (MIN-) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Remove the inner rear view mirror assembly (amplifier microphone assembly) (Refer to REMOVAL [10/2014 - 10/2015] ).
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
   10 (SGND) - 12 (MIC-)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Inner Rear View Mirror Assembly (Amplifier Microphone Assembly))

Result: 

OK 

REPLACE NAVIGATION ECU SUB-ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPLACE INNER REAR VIEW MIRROR ASSEMBLY (AMPLIFIER MICROPHONE ASSEMBLY) 

(Refer to REMOVAL [10/2014 - 10/2015] )