DTC B1549-13: Voice Recognition Microphone2 Circuit Open [10/2022 - ]: Procedure

1. Disconnect the H109 radio and display receiver assembly connector.
2. Disconnect the R26 telephone microphone assembly RH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H109-21 (SNS2) - R26-5 (SNS2)	Always	Below 1 Ω
   H109-18 (MI2-) - R26-4 (MO2-)	Always	Below 1 Ω
   H109-21 (SNS2) or R26-5 (SNS2) - Body ground	Always	10 kΩ or higher
   H109-18 (MI2-) or R26-4 (MO2-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. With the radio and display receiver assembly connectors connected, disconnect the R26 telephone microphone assembly RH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R26-4 (MO2-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  3

1. Remove the telephone microphone assembly RH.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone microphone assembly RH)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   5 (SNS2) - 4 (MO2-)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

Result: 

NG 

REPLACE TELEPHONE MICROPHONE ASSEMBLY RH 

Refer to REMOVAL [10/2022 - ]