DTC B1206: P/W Master Switch Communication Stop [08/2015 - 08/2019]: Procedure

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

Result: 

NEXT 

See step  2

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

   OK

   DTC B1206 is not output.

Result: 

OK 

USE SIMULATION METHOD TO CHECK 

(Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [08/2015 - ] )

Result: 

NG 

See step  3

1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly (Refer to REMOVAL [08/2015 - 08/2019] ).
2. Disconnect the K3 multiplex network 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) - K3-17 (LIN1)	Always	Below 1 Ω
   A-16 (LIN2) or K3-17 (LIN1) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the K3 multiplex network master switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K3-12 (GND) - 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
   K3-11 (B) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Multiplex Network Master Switch Assembly)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Temporarily replace the multiplex network master switch assembly with a new or normally functioning one (Refer to REMOVAL [08/2015 - ] ).

Result: 

NEXT 

See step  6

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

Result: 

NEXT 

See step  7

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

   OK

   DTC B1206 is not output.

Result: 

OK 

END (MULTIPLEX NETWORK MASTER SWITCH IS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

(Refer to REMOVAL [08/2015 - 08/2019] )