DTC B1206: P/W Master Switch Communication Stop [08/2017 - 08/2019]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2015 - 08/2019]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2015 - 08/2019]

   Result

   Proceed to
   DTC B1206 is output
   DTC B1206 is not output

Result: 

DTC B1206 is not output 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - 08/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 08/2019] 

Result: 

DTC B1206 is output 

See step  3

1. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH.

   Refer to REMOVAL [08/2017 - 08/2019]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-16 (LIN2) - M2-6 (LIN1)	Always	Below 1 Ω
   A-16 (LIN2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  4

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)

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

   Standard Resistance

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

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Temporarily replace the power window regulator master switch assembly with a new or normally functioning one.

   Refer to INSPECTION [08/2015 - ]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2015 - 08/2019]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2015 - 08/2019]

   Result

   Proceed to
   DTC B1206 is not output
   DTC B1206 is output

Result: 

DTC B1206 is not output 

END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY IS DEFECTIVE) 

Result: 

DTC B1206 is output 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2017 - 08/2019] 

1. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH.

   Refer to REMOVAL [08/2017 - 08/2019]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3I-17 - M2-6 (LIN1)	Always	Below 1 Ω
   3I-17 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COWL SIDE JUNCTION BLOCK LH. Refer to  REMOVAL [08/2017 - 08/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR