DTC B1579: Voice Recognition Microphone Disconnected [08/2019 - ]: 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 Receiver Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J147-22 (MIN-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  2

1. Choose the model to be inspected.

   Result

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

Result: 

B 

See step  8

Result: 

A 

See step  3

1. Disconnect the J157 DCM (telematics transceiver) connector.
2. Disconnect the U15 telephone microphone assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J157-7 (MCI-) - U15-4 (MCO-)	Always	Below 1 Ω
   J157-7 (MCI-) or U15-4 (MCO-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the J147 radio receiver assembly connector.
2. Disconnect the J157 DCM (telematics transceiver) connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J147-22 (MIN-) - J157-32 (MCO-)	Always	Below 1 Ω
   J147-22 (MIN-) or J157-32 (MCO-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the J147 radio receiver assembly connector.
2. Disconnect the U15 telephone microphone assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J147-25 (SNS2) - U15-3 (SNS2)	Always	Below 1 Ω
   J147-25 (SNS2) or U15-3 (SNS2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Reconnect the J157 DCM (telematics transceiver) connector.
2. Reconnect the J147 radio receiver assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J157-7 (MCI-) - Body ground	Always	Below 1 Ω

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  7

1. Remove the telephone microphone assembly.

   Refer to REMOVAL [08/2019 - ]

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

   Standard Resistance

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone Microphone Assembly)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

NG 

REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

1. Disconnect the J147 radio receiver assembly connector.
2. Disconnect the U15 telephone microphone assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J147-25 (SNS2) - U15-3 (SNS2)	Always	Below 1 Ω
   J147-22 (MIN-) - U15-4 (MCO-)	Always	Below 1 Ω
   J147-25 (SNS2) or U15-3 (SNS2) - Body ground	Always	10 kΩ or higher
   J147-22 (MIN-) or U15-4 (MCO-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Remove the telephone microphone assembly.

   Refer to REMOVAL [08/2019 - ]

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

   Standard Resistance

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Telephone Microphone Assembly)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

NG 

REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [08/2019 - ]