MULTIPLEX COMMUNICATION SYSTEM, Diagnostic DTC:B1214, B1215

DTC Code DTC Name
B1214 Short to B+ in Door System Communication Bus Malfunction
B1215 Short to GND in Door System Communication Bus Malfunction

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
B1214 Door system communication circuit and +B battery system short

  • Main body ECU RH (Cowl side junction block RH)

  • Gateway ECU

  • Multiplex tilt and telescopic ECU

  • Windshield wiper switch assembly

  • Multiplex network master switch

  • Certification ECU (Smart key ECU assembly)

  • Power source control ECU

  • Front power seat switch RH (Position control ECU)

  • Front power seat switch LH (Position control ECU)

  • Main body ECU LH (Cowl side junction block LH)

  • Outer mirror control ECU RH

  • Outer mirror control ECU LH

  • Front controller (Engine room relay block No.2)

  • Overhead junction block

  • Rain sensor

  • Sliding roof control ECU*1

  • Double lock door control relay*2

  • Wire harness or connector
B1215 Door system communication circuit and body ground short

  • Main body ECU RH (Cowl side junction block RH)

  • Gateway ECU

  • Multiplex tilt and telescopic ECU

  • Windshield wiper switch assembly

  • Multiplex network master switch

  • Certification ECU (Smart key ECU assembly)

  • Power source control ECU

  • Front power seat switch RH (Position control ECU)

  • Front power seat switch LH (Position control ECU)

  • Main body ECU LH (Cowl side junction block LH)

  • Outer mirror control ECU RH

  • Outer mirror control ECU LH

  • Front controller (Engine room relay block No.2)

  • Overhead junction block

  • Rain sensor

  • Sliding roof control ECU*1

  • Double lock door control relay*2

  • Wire harness or connector

Tech Tips

*1: w/ Sliding Roof System

*2: w/ Double Locking System

WIRING DIAGRAM

A0162NJE05
A01636QE03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (MAIN BODY ECU RH)


    1. A0161ZME01

      Disconnect the J75 and RJ connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (FRONT CONTROLLER) Click here

    OK

  2. CHECK FOR DTC (MULTIPLEX TILT AND TELESCOPIC ECU)


    1. A0161YEE01

      Reconnect the J75 and RJ connectors.

    2. Disconnect the J28 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - MAIN BODY ECU RH) Click here

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

  3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - MAIN BODY ECU RH)


    1. A0161VFE01

      Reconnect the J28 connector.

    2. Disconnect the RA connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - MAIN BODY ECU RH)

  4. CHECK FOR DTC (FRONT CONTROLLER)


    1. A015ZRSE01

      Reconnect the J75 and RJ connectors.

    2. Disconnect the 2F connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS, CONNECTOR AND EACH ECU Click here

    OK

    REPLACE FRONT CONTROLLER

  5. CHECK HARNESS, CONNECTOR AND EACH ECU


    1. A0161YAE01

      Disconnect the RJ connector.

    2. Turn the engine switch on (IG).

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs B1214 and B1215 are not output (for LHD) A
      DTCs B1214 and B1215 are not output (for RHD) B
      DTCs B1214 or B1215 is output C
      OK
      DTCs B1214 and B1215 are not output.

    B

    CHECK FOR DTC (OUTER MIRROR CONTROL ECU RH) Click here

    C

    CHECK HARNESS, CONNECTOR AND EACH ECU Click here

    A

  6. CHECK FOR DTC (MULTIPLEX NETWORK MASTER SWITCH)


    1. A015ZAXE34

      Reconnect the RJ and 2F connectors.

    2. Disconnect the M20 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS, CONNECTOR AND EACH ECU Click here

    OK

    REPLACE MULTIPLEX NETWORK MASTER SWITCH Click here

  7. CHECK HARNESS, CONNECTOR AND EACH ECU


    1. A016243E02

      Disconnect the 2F connector.

    2. Turn the engine switch on (IG).

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU)) Click here

    OK

  8. CHECK FOR DTC (MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH))


    1. A01634OE01

      Reconnect the M20 and 2F connectors.

    2. Disconnect the A30 and Q3 connectors.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - MAIN BODY ECU LH) Click here

    OK

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

  9. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - MAIN BODY ECU LH)


    1. A015ZAXE34

      Disconnect the M20 connector.

    2. Turn the engine switch on (IG).

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - FRONT CONTROLLER)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - MAIN BODY ECU LH)

  10. CHECK FOR DTC (FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU))


    1. A01631LE04

      Reconnect the M20 and 2F connectors.

    2. Disconnect the T7 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (DOUBLE LOCK DOOR CONTROL RELAY) Click here

    OK

    REPLACE FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU RH) Click here

  11. CHECK FOR DTC (DOUBLE LOCK DOOR CONTROL RELAY)


    1. A0162ZKE01

      Reconnect the T7 connector.

    2. Disconnect the P34 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (OUTER MIRROR CONTROL ECU RH) Click here

    OK

    REPLACE DOUBLE LOCK DOOR CONTROL RELAY

  12. CHECK FOR DTC (OUTER MIRROR CONTROL ECU RH)


    1. A0161KYE06

      Disconnect the L10 connector.

    2. Turn the engine switch on (IG).

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - CERTIFICATION ECU) Click here

    OK

    REPLACE OUTER MIRROR CONTROL ECU RH Click here

  13. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - CERTIFICATION ECU)


    1. A0161ZQE16

      Disconnect the M20 and P33 connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P33-28 (MPX2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      P33-28 (MPX2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - CERTIFICATION ECU)

    OK

  14. CHECK HARNESS AND CONNECTOR


    1. Reconnect the M20 connector.

    2. A0161YAE01

      Disconnect the RJ connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      RJ-21 - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      RJ-21 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  15. CHECK HARNESS, CONNECTOR AND EACH ECU


    1. A01631RE08

      Reconnect the RJ and 2F connectors.

    2. Disconnect the R5 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    6. Proceed to next step based on the inspection result.

      Result
      Result Proceed to
      OK (w/ Sliding roof system) A
      OK (w/o Sliding roof system) B
      NG C

    B

    CHECK FOR DTC (RAIN SENSOR) Click here

    C

    CHECK FOR DTC (FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU)) Click here

    A

  16. CHECK FOR DTC (SLIDING ROOF CONTROL ECU)


    1. A015ZEHE06

      Reconnect the R5 connector.

    2. Disconnect the R6 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - OVERHEAD JUNCTION BLOCK) Click here

    OK

    REPLACE SLIDING ROOF CONTROL ECU Click here

  17. CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - OVERHEAD JUNCTION BLOCK)


    1. A01631RE11

      Disconnect the R5 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R5-38 (MPX2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      R5-38 (MPX2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SLIDING ROOF ECU - OVER HEAD JUNCTION BLOCK)

    OK

  18. CHECK FOR DTC (RAIN SENSOR)


    1. A015ZATE03

      Reconnect the R5 and R6* connectors.

    2. Disconnect the R7 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      Tech Tips

      *: w/ Sliding Roof System

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (RAIN SENSOR - OVERHEAD JUNCTION BLOCK) Click here

    OK

    REPLACE RAIN SENSOR Click here

  19. CHECK HARNESS AND CONNECTOR (RAIN SENSOR - OVERHEAD JUNCTION BLOCK)


    1. A01631RE10

      Disconnect the R5 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R5-37 (MPX1) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      R5-37 (MPX1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (RAIN SENSOR - OVERHEAD JUNCTION BLOCK)

    OK

    REPLACE OVERHEAD JUNCTION BLOCK

  20. CHECK FOR DTC (FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU))


    1. A01631LE05

      Reconnect the R5 connector.

    2. Disconnect the U7 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (OUTER MIRROR CONTROL ECU LH) Click here

    OK

    REPLACE FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU) Click here

  21. CHECK FOR DTC (OUTER MIRROR CONTROL ECU LH)


    1. A015YO3E05

      Reconnect the U7 connector.

    2. Disconnect the M10 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (WINDSHIELD WIPER SWITCH ASSEMBLY) Click here

    OK

    REPLACE OUTER MIRROR CONTROL ECU LH Click here

  22. CHECK FOR DTC (WINDSHIELD WIPER SWITCH ASSEMBLY)


    1. A0162R1E03

      Reconnect the M10 connector.

    2. Disconnect the J26 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - FRONT CONTROLLER) Click here

    OK

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

  23. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - FRONT CONTROLLER)


    1. A0160C6E22

      Reconnect the J26 connector.

    2. Disconnect the J55 and 2F connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J55-24 (MPX2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J55-24 (MPX2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - FRONT CONTROLLER)

    OK

  24. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - POWER SOURCE CONTROL ECU)


    1. A0162R1E10

      Reconnect the 2F connector.

    2. Disconnect the J26 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J26-7 (MPX2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J26-7 (MPX2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (WINDSHIELD WIPER SWITCH - POWER SOURCE CONTROL ECU)

    OK

  25. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - GATEWAY ECU)


    1. A0160KVE07

      Reconnect the J55 connector

    2. Disconnect the J76 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J76-12 (MPD2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J76-12 (MPD2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (WINDSHIELD WIPER SWITCH - GATEWAY ECU)

    OK

  26. CHECK HARNESS AND CONNECTOR (GATEWAY ECU - MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH))


    1. A015ZV5E03

      Reconnect the J26 connector.

    2. Disconnect the J75 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J75-21 (MPX2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J75-21 (MPX2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GATEWAY ECU - MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH))

    OK

  27. REPLACE GATEWAY ECU


    1. Reconnect the J75 connector.

    2. Replace the Gateway ECU with a normally functioning ECU.

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    REPLACE POWER SOURCE CONTROL ECU

    OK

    END (GATEWAY ECU WAS DEFECTIVE)

  28. CHECK FOR DTC (OUTER MIRROR CONTROL ECU RH)


    1. A0161KYE06

      Reconnect the RJ and 2F connectors.

    2. Disconnect the L10 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    6. Proceed to next step based on the inspection result.

      Result
      Result Proceed to
      OK A
      NG (w/ Double locking system) B
      NG (w/o Double locking system) C

    B

    CHECK FOR DTC (DOUBLE LOCK DOOR CONTROL RELAY) Click here

    C

    CHECK FOR DTC (FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU)) Click here

    A

    REPLACE OUTER MIRROR CONTROL ECU Click here

  29. CHECK FOR DTC (DOUBLE LOCK DOOR CONTROL RELAY)


    1. A0162ZKE01

      Reconnect the L10 connector.

    2. Disconnect the P34 connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU)) Click here

    OK

    REPLACE DOUBLE LOCK DOOR CONTROL RELAY

  30. CHECK FOR DTC (FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU))


    1. A01631LE04

      Reconnect the P34 connector.

    2. Disconnect the T7 connector.

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (MULTIPLEX NETWORK MASTER SWITCH) Click here

    OK

    REPLACE FRONT POWER SEAT SWITCH RH Click here

  31. CHECK FOR DTC (MULTIPLEX NETWORK MASTER SWITCH)


    1. A015ZAXE35

      Reconnect the T7 connector.

    2. Disconnect the L22 connector.

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - POWER WINDOW MASTER SWITCH) Click here

    OK

    REPLACE MULTIPLEX NETWORK MASTER SWITCH Click here

  32. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - POWER WINDOW MASTER SWITCH)


    1. A0160QAE02

      Disconnect the RJ connector.

    2. Clear the DTC Click here.

    3. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK FOR DTC (MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)) Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU RH - MULTIPLEX NETWORK MASTER SWITCH)

  33. CHECK FOR DTC (MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH))


    1. A01634OE01

      Reconnect the L22 and RJ connectors.

    2. Disconnect the Q3 and A30 connectors.

    3. Clear the DTC Click here.

    4. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - FRONT CONTROLLER) Click here

    OK

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

  34. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - FRONT CONTROLLER)


    1. A0161W4E02

      Reconnect the Q3 connector.

    2. Disconnect the 2F connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTC Click here.

    5. Check for DTCs Click here.

      OK
      DTCs B1214 and B1215 are not output.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - CERTIFICATION ECU) Click here

    OK

    REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - FRONT CONTROLLER)

  35. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - CERTIFICATION ECU)


    1. A016302E05

      Reconnect the 2F and A30 connectors.

    2. Disconnect the P33 and Q3 connectors.

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

      Standard Voltage
      Tester Connection Condition Specified condition
      P33-28 (MPX2) - Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      P33-28 (MPX2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - CERTIFICATION ECU)

    OK

  36. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - EACH ECU)


    1. A0161ZQE15

      Disconnect the L22 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P33-27 (MPX1) Body ground Always Below 1 V
      Standard Resistance
      Tester Connection Condition Specified condition
      P33-27 (MPX1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - EACH ECU)

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)