DTC B1206: P/W Master Switch Communication Stop [08/2015 - 08/2017]: Procedure

1. Disconnect the H2 main body ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the M2 power window regulator master switch assembly connector.
3. Measure the resistance and voltage according to the value(s) in the tables below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H2-10 (LIN2) - M2-6 (LIN1)	Always	Below 1 Ω
   H2-10 (LIN2) or M2-6 (LIN1) - Body ground	Always	10 kΩ or higher

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M2-6 (LIN1) - Body ground	Always	Below 1 V

4. Reconnect the main body ECU connector.
5. Reconnect the power window regulator master switch assembly connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the M2 power window regulator master switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M2-1 (E) - Body ground	Always	Below 1 Ω

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M2-3 (B) - Body ground	Always	11 to 14 V

3. Reconnect the power window regulator master switch assembly connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Temporarily replace the power window regulator master switch assembly with a new or normally functioning one (Refer to REMOVAL [08/2015 - ] ).
2. Clear the DTC (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

Result: 

NEXT 

See step  4

1. Recheck for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC B1206 is not output	A
   DTC B1206 is output	B

Result: 

A 

END (MASTER SWITCH IS DEFECTIVE) 

Result: 

B 

REPLACE MAIN BODY ECU