DTC B1572: Telephone Microphone Error [10/2014 - ]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and wait for 10 seconds.
4. Turn the Techstream on.
5. Perform "Health Check" and check for current DTCs (Refer to HEALTH CHECK [10/2014 - ] ).

   Result

   Result	Proceed to
   DTC B1572 is output.	A
   DTC B1572 is not output.	B

Result: 

B 

CHECK FOR INTERMITTENT PROBLEMS 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] or HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result: 

A 

See step  2

1. Remove the inner rear view mirror assembly (telephone microphone assembly) but do not disconnect the connectors (Refer to REMOVAL [10/2014 - 10/2015] or REMOVAL [10/2015 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N2-9 (ACC) - Body ground	Engine switch on (ACC)	4 to 6 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N2-12 (MIC-) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Inner Rear View Mirror Assembly (Telephone Microphone Assembly))

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Disconnect the E11 DCM (Telematics Transceiver) connector.
2. Disconnect the N2 inner rear view mirror 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
   E11-34 (MCI+) - N2-11 (MIC+)	Always	Below 1 Ω
   E11-35 (MCI-) - N2-12 (MIC-)	Always	Below 1 Ω
   E11-34 (MCI+) - Body ground	Always	10 kΩ or higher
   E11-35 (MCI-) - Body ground	Always	10 kΩ or higher
   E11-32 (SGND) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE INNER REAR VIEW MIRROR ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the DCM (Telematics Transceiver) but do not disconnect the connectors (Refer to REMOVAL [10/2014 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E11-33 (MCVD) - Body ground	Engine switch on (ACC)	4 to 6 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E11-35 (MCI-) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

See step  5

1. Replace the DCM (Telematics Transceiver) (Refer to REMOVAL [10/2014 - ] ).
   NOTE:

   • The engine switch must be off.
   • Do not replace the DCM (Telematics Transceiver) with one from another vehicle.

Result: 

NEXT 

See step  6

1. Perform "PRL UPDATE" (Refer to PRL UPDATE [10/2014 - ] ).

Result: 

NEXT 

PERFORM DCM ACTIVATION 

(Refer to DCM ACTIVATION [10/2014 - ] )