DTC B1579: Voice Recognition Microphone Disconnected [09/2014 - 11/2017]: 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
   O57-48 (MIN-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017] 

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  7

Result: 

A 

See step  3

1. Disconnect the O65 DCM (telematics transceiver) connector.
2. Disconnect the W4 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
   O65-35 (MCI-) - W4-2 (MCO-)	Always	Below 1 Ω
   O65-35 (MCI-) - 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 O57 radio receiver assembly connector.
2. Disconnect the O65 DCM (telematics transceiver) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O57-48 (MIN-) - O65-19 (MCO-)	Always	Below 1 Ω
   O57-48 (MIN-) - 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 O57 radio receiver assembly connector.
2. Disconnect the W4 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
   O57-49 (SNS2) - W4-1 (SNS2)	Always	Below 1 Ω
   O57-49 (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 O65 DCM (telematics transceiver) connector.
2. Reconnect the O57 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
   O65-35 (MCI-) - Body ground	Always	Below 1 Ω

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  8

Result: 

NG 

REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2014 - 11/2017] 

1. Disconnect the O57 radio receiver assembly connector.
2. Disconnect the W4 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
   O57-49 (SNS2) - W4-1 (SNS2)	Always	Below 1 Ω
   O57-48 (MIN-) - W4-2 (MCO-)	Always	Below 1 Ω
   O57-49 (SNS2) - Body ground	Always	10 kΩ or higher
   O57-48 (MIN-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

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

   Refer to REMOVAL [09/2014 - 10/2015] , or refer to REMOVAL [10/2015 - 11/2017]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 (SNS2) - 2 (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: 

OK 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017] 

Result: 

NG 

See step  9

1. Replace the telephone microphone assembly with a new or known good one.

   Refer to REMOVAL [09/2014 - 11/2017]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

   Body Electrical > Navigation System > Clear DTCs 

3. Recheck for DTCs and check that no DTCs are output.

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [09/2014 - 10/2015]  , or refer to  REMOVAL [10/2015 - 11/2017]