DTC B1206: P/W Master Switch Communication Stop [09/2014 - ]: Procedure

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1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [09/2014 - ]

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   HINT: 

   This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-21 - MB-16 (LIN2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  2

1. Disconnect the S10*1 or S3*2 multiplex network master switch assembly connector.
   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System
2. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the engine switch from on (IG) to off and wait 180 seconds or more without operating any switches.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-21 - S10-7 (LIN1)*1	Engine switch off	Below 1 Ω
   4B-21 - S3-17 (LIN1)*2	Engine switch off	Below 1 Ω
   S10-7 (LIN1) or 4B-21 - Body ground*1	Engine switch off	10 kΩ or higher
   S3-17 (LIN1) or 4B-21 - Body ground*2	Engine switch off	10 kΩ or higher

   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   S10-21 (B) - S10-17 (GND)*1	Always	11 to 14 V
   S3-11 (B) - S3-12 (GND)*2	Always	11 to 14 V

   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S10-17 (GND) - Body ground*1	Always	Below 1 Ω
   S3-12 (GND) - Body ground*2	Always	Below 1 Ω

   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Replace the multiplex network master switch assembly.

   Refer to REMOVAL [09/2014 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

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

   Body Electrical > Main Body > Clear DTCs 

2. Recheck for DTCs.

   Body Electrical > Main Body > Trouble Codes 

   OK

   DTC B1206 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ]