DTC B1579: Voice Recognition Microphone Disconnected [11/2016 - ]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F71-19 (MIN-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

Result:  1

OK 

See step  2

1. Disconnect the F71 radio and display receiver assembly connector.
2. Disconnect the S1 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
   F71-6 (SNS2) - S1-13 (SNS2)	Always	Below 1 Ω
   F71-19 (MIN-) - S1-4 (MCO-)	Always	Below 1 Ω
   F71-6 (SNS2) or S1-13 (SNS2) - Body ground	Always	10 kΩ or higher
   F71-19 (MIN-) or S1-4 (MCO-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  3

1. Remove the map light assembly (telephone microphone assembly).

   Refer to REMOVAL [12/2013 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   13 (SNS2) - 4 (MCO-)	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Map Light Assembly (Telephone Microphone Assembly))

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

Result:  2

NG 

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY). Refer to  REMOVAL [12/2013 - ]