LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1206

DESCRIPTION

This DTC is stored when LIN communication between the multiplex network master switch assembly and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   

   1. Remove the instrument panel junction block assembly.

      Click here

      

      *a

      Component without harness connected (Instrument Panel Junction Block Assembly)

      -

      -

   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.

      Tech Tips

      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

   
   

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

   OK

2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

   
   

   1. for LHD

      
      

      1. Disconnect the N27*1 or N18*2 multiplex network master switch assembly connector.

         
         

         • *1: w/o Seat Position Memory System

         • *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 power switch from on (IG) to off and wait for 60 seconds or more without operating any switches.

         Standard Resistance
         Tester Connection Condition Specified Condition 4B-21 - N27-7 (LIN1)*1 Power switch off Below 1 Ω 4B-21 - N18-17 (LIN1)*2 Power switch off Below 1 Ω N27-7 (LIN1) - Body ground*1 Power switch off 10 kΩ or higher N18-17 (LIN1) - Body ground*2 Power switch off 10 kΩ or higher 4B-21 - Body ground Power switch off 10 kΩ or higher

         
         

         • *1: w/o Seat Position Memory System

         • *2: w/ Seat Position Memory System

   2. for RHD

      
      

      1. Disconnect the N12*1 or N3*2 multiplex network master switch assembly connector.

         
         

         • *1: w/o Seat Position Memory System

         • *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 power switch from on (IG) to off and wait for 60 seconds or more without operating any switches.

         Standard Resistance
         Tester Connection Condition Specified Condition 4B-21 - N12-7 (LIN1)*1 Power switch off Below 1 Ω 4B-21 - N3-17 (LIN1)*2 Power switch off Below 1 Ω N12-7 (LIN1) - Body ground*1 Power switch off 10 kΩ or higher N3-17 (LIN1) - Body ground*2 Power switch off 10 kΩ or higher 4B-21 - Body ground Power switch off 10 kΩ or higher

         
         

         • *1: w/o Seat Position Memory System

         • *2: w/ Seat Position Memory System

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - AUXILIARY BATTERY, BODY GROUND)

   
   

   1. for LHD

      
      

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

         Standard Voltage
         Tester Connection Condition Specified Condition N27-21 (B) - N27-17 (GND)*1 Power switch off 11 to 14 V N18-11 (B) - N18-12 (GND)*2 Power switch off 11 to 14 V

         
         

         • *1: w/o Seat Position Memory System

         • *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 N27-17 (GND) - Body ground*1 Always Below 1 Ω N18-12 (GND) - Body ground*2 Always Below 1 Ω

         
         

         • *1: w/o Seat Position Memory System

         • *2: w/ Seat Position Memory System

   2. for RHD

      
      

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

         Standard Voltage
         Tester Connection Condition Specified Condition N12-21 (B) - N12-17 (GND)*1 Power switch off 11 to 14 V N3-11 (B) - N3-12 (GND)*2 Power switch off 11 to 14 V

         
         

         • *1: w/o Seat Position Memory System

         • *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 N12-17 (GND) - Body ground*1 Always Below 1 Ω N3-12 (GND) - Body ground*2 Always Below 1 Ω

         
         

         • *1: w/o Seat Position Memory System

         • *2: w/ Seat Position Memory System

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

   
   

   1. Replace the multiplex network master switch assembly.

      Click here

      Result
      Proceed to NEXT

   
   

   NEXT

5. CHECK DTC OUTPUT

   
   

   1. Clear the DTCs.

      Click here

      
      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

   
   

   OK

   END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

   NG

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here