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DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SUB BUS 1 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      GTY419659Courtesy 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 Result
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 54 Ω:
      Short circuit between bus lines
      70 Ω or higher:
      Open circuit in a main bus line
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)

      Result

      Result Proceed to
      OK A
      Open circuit in CAN main bus line B
      Short circuit between bus lines C
      • Ground short
      • +B short
      		 D

    B → See step   3 

    C → See step   9 

    D → See step   17 

    A: Go to next step 

  2. RECONFIRM DTC OUTPUT 
    1. Reconnect the cable to the negative (-) auxiliary battery terminal.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Clear the DTCs.
    6. Turn the power switch off.
    7. Turn the power switch on (IG) and recheck for DTCs.

      Result

      Result Proceed to
      U1002 is output from main body ECU (multiplex network body ECU)
      (Techstream display: Main Body)      		 A
      Other DTC is output B

    B → See step   25 

    A → See step   26 

  3. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H136 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY395883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → See step   8 

    OK: Go to next step 

  4. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2) 
    1. Reconnect the H136 wire harness connector.
    2. Disconnect the H142 wire harness connector.
      GTY418330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN Junction Connector LH2)
      *b to CAN Junction Connector RH2
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H142-1 (CANH) - H142-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → See step   5 

    OK → REPLACE CAN JUNCTION CONNECTOR LH2 

  5. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2) 
    1. Reconnect the H142 wire harness connector.
    2. Disconnect the H143 wire harness connector.
      GTY413640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN Junction Connector RH2)
      *b to CAN Junction Connector LH2
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H143-1 (CANH) - H143-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2) 

    OK: Go to next step 

  6. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN J/C RH2) 
    1. Reconnect the H143 wire harness connector.
    2. Disconnect the H144 wire harness connector.
      GTY398770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN Junction Connector RH2)
      *b to CAN No. 2 Junction Connector
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H144-1 (CANH) - H144-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → See step   7 

    OK → REPLACE CAN JUNCTION CONNECTOR RH2 

  7. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 2 J/C) 
    1. Reconnect the H144 wire harness connector.
    2. Disconnect the H145 CAN No. 2 junction connector.
      GTY404965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN No. 2 Junction Connector)
      *b to CAN Junction Connector RH2
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H145-3 (CANH) - H145-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 2 J/C) 

    OK → REPLACE CAN NO. 2 JUNCTION CONNECTOR 

  8. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Reconnect the H136 wire harness connector.
    2. Disconnect the H9 main body ECU (multiplex network body ECU) connector.
      GTY419962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H9-9 (CANP) - H9-10 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Main Body ECU (Multiplex Network Body ECU))

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    OK → See step   26 

  9. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H136 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY395883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → See step   16 

    OK: Go to next step 

  10. CHECK FOR SHORT IN SUB BUS 1 LINES (BRANCH LINE) 
    1. Reconnect the H136 wire harness connector.
    2. Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the main body ECU main line harness connector.
      GTY403814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (CAN Junction Connector LH2)
    3. While observing the resistance value shown on the tester, disconnect connectors (H135, H137, H138, H139, H140 and H141) from the CAN junction connector LH2 or CAN junction connector RH2 one by one until the resistance becomes normal (between 54 and 69 Ω).
      GTY396859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *A w/ Seat Position Memory System (for Driver Side) *B w/ Seat Position Memory System (for Front Passenger Side)
      *C w/ Power Trunk Lid System - -
      *1 Main Body ECU (Multiplex Network Body ECU) *2 Front Power Seat Switch LH
      *3 Outer Mirror Control ECU Assembly LH *4 Multiplex Tilt and Telescopic ECU
      *5 Luggage Closer Motor Assembly *6 CAN Junction Connector LH2
      *7 Outer Mirror Control ECU Assembly RH *8 Front Power Seat Switch RH
      *9 CAN No. 2 Junction Connector *10 CAN Junction Connector RH2
      GTY415844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (CAN Junction Connector LH2)      		 - -
      WIRING COLOR

      CAN Junction Connector LH2 Side Code Color (CANH Side) Color (CANL Side)
      Luggage closer motor assembly*1 H135 V GR
      Main body ECU (Multiplex network body ECU) H136 Y GR
      Multiplex tilt and telescopic ECU*2*3 H137 L GR
      Outer mirror control ECU assembly LH*2*3 H138 G GR
      Front power seat switch LH*2 H140 R GR
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN junction connector RH2) H142 B GR
      • *1: w/ Power trunk lid system
      • *2: w/ Seat position memory system (for Driver side)
      • *3: w/ Seat position memory system (for Front passenger side)
      GTY403867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (CAN Junction Connector RH2)      		 - -
      WIRING COLOR

      CAN Junction Connector RH2 Side Code Color (CANH Side) Color (CANL Side)
      Outer mirror control ECU assembly RH*1*2 H139 R GR
      Front power seat switch RH*2 H141 G GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN junction connector LH2) H143 B GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN No. 2 junction connector) H144 L GR
      • *1: w/ Seat position memory system (for Driver side)
      • *2: w/ Seat position memory system (for Front passenger side)
      NOTE:

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch lines.

      Result

      Symptom Proceed to
      The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts between a pair of branch lines.) A
      The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short between one or more pairs of branch lines.) B
    4. When there is a short in one or more of the branch lines:
      1. Reconnect all of the connectors to the CAN junction connectors, except for the one that was disconnected last (the short-circuited bus line). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch line only.

        HINT: 

        • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
        • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.

    B → See step   15 

    A: Go to next step 

  11. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2) 
    1. Disconnect the H142 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY403814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (CAN Junction Connector LH2)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → REPLACE CAN JUNCTION CONNECTOR LH2 

    OK: Go to next step 

  12. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2) 
    1. Reconnect the H142 wire harness connector.
    2. Disconnect the H143 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY403814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (CAN Junction Connector LH2)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2) 

    OK: Go to next step 

  13. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C RH2) 
    1. Reconnect the H143 wire harness connector.
    2. Disconnect the H144 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY403814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (CAN Junction Connector LH2)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    NG → REPLACE CAN JUNCTION CONNECTOR RH2 

    OK: Go to next step 

  14. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 2 J/C) 
    1. Reconnect the H144 wire harness connector.
    2. Disconnect the H145 CAN No. 2 junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY403814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (CAN Junction Connector LH2)

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 2 J/C) 

    OK → REPLACE CAN NO. 2 JUNCTION CONNECTOR 

  15. CHECK FOR SHORT IN SUB BUS 1 LINES (ECU, SENSOR) 
    1. Reconnect the connector for the short-circuited branch line to the CAN junction connector (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch line is connected. Refer to TERMINALS OF ECU [08/2013 - ] .
    3. Measure the resistance according to the value(s) in the table below.
      GTY403814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (CAN Junction Connector LH2)

      HINT: 

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU, there may be a short in the ECU.

    NG → REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

    OK → REPLACE CORRESPONDING ECU OR SENSOR 

  16. CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Reconnect the H136 wire harness connector.
    2. Disconnect the H9 main body ECU (multiplex network body ECU) connector.
      GTY419962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H9-9 (CANP) - H9-10 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Main Body ECU (Multiplex Network Body ECU))

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    OK → See step   26 

  17. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H136 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY409051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Rear view of wire harness connector
      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 1 inspection.

    NG → See step   24 

    OK: Go to next step 

  18. CHECK FOR SHORT IN SUB BUS 1 LINE (BRANCH LINE) 
    1. Reconnect the H136 wire harness connector.
    2. Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the wire harness connector (H136) and CG or BAT of the DLC3.
      GTY419659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)

      HINT: 

      It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

    3. While observing the resistance value shown on the ohmmeter, disconnect branch line connectors (H135, H137, H138, H139, H140 and H141) from the CAN junction connector LH2 or CAN junction connector RH2 until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).
      GTY396859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *A w/ Seat Position Memory System (for Driver Side) *B w/ Seat Position Memory System (for Front Passenger Side)
      *C w/ Power Trunk Lid System - -
      *1 Main Body ECU (Multiplex Network Body ECU) *2 Front Power Seat Switch LH
      *3 Outer Mirror Control ECU Assembly LH *4 Multiplex Tilt and Telescopic ECU
      *5 Luggage Closer Motor Assembly *6 CAN Junction Connector LH2
      *7 Outer Mirror Control ECU Assembly RH *8 Front Power Seat Switch RH
      *9 CAN No. 2 Junction Connector *10 CAN Junction Connector RH2
      GTY415844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (CAN Junction Connector LH2)      		 - -
      WIRING COLOR

      CAN Junction Connector LH2 Side Code Color (CANH Side) Color (CANL Side)
      Luggage closer motor assembly*1 H135 V GR
      Main body ECU (Multiplex network body ECU) H136 Y GR
      Multiplex tilt and telescopic ECU*2*3 H137 L GR
      Outer mirror control ECU assembly LH*2*3 H138 G GR
      Front power seat switch LH*2 H140 R GR
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN junction connector RH2) H142 B GR
      • *1: w/ Power trunk lid system
      • *2: w/ Seat position memory system (for Driver side)
      • *3: w/ Seat position memory system (for Front passenger side)
      GTY403867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (CAN Junction Connector RH2)      		 - -
      WIRING COLOR

      CAN Junction Connector RH2 Side Code Color (CANH Side) Color (CANL Side)
      Outer mirror control ECU assembly RH*1*2 H139 R GR
      Front power seat switch RH*2 H141 G GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN junction connector LH2) H143 B GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN No. 2 junction connector) H144 L GR
      • *1: w/ Seat position memory system (for Driver side)
      • *2: w/ Seat position memory system (for Front passenger side)

      Result

      Result Proceed to
      The resistance between terminals CANP and BAT, or the resistance between terminals CANN and BAT is still below 6 kΩ when all the specified connectors are disconnected from the CAN junction connector.
      (There is no short to +B in the branch lines.)      		 A
      The resistance between terminals CANP and GND, or the resistance between terminals CANN and GND is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector.
      (There is no short to GND in the branch lines.)
      The resistance between terminals CANP and BAT, or the resistance between terminals CANN and BAT becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector.
      (There is a short to +B in one of the areas related to one or more of the disconnected branch lines.)      		 B
      The resistance between terminals CANP and GND, or the resistance between terminals CANN and GND becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector.
      (There is a short to GND in one of the areas related to one or more of the disconnected branch lines.)

    B → See step   23 

    A: Go to next step 

  19. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2) 
    1. Disconnect the H142 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY419659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 1 inspection.

    NG → REPLACE CAN JUNCTION CONNECTOR LH2 

    OK: Go to next step 

  20. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - CAN J/C RH2) 
    1. Reconnect the H142 wire harness connector.
    2. Disconnect the H143 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY419659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 1 inspection.

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2) 

    OK: Go to next step 

  21. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C RH2) 
    1. Reconnect the H143 wire harness connector.
    2. Disconnect the H144 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY419659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 1 inspection.

    NG → REPLACE CAN JUNCTION CONNECTOR RH2 

    OK: Go to next step 

  22. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 2 J/C) 
    1. Reconnect the H144 wire harness connector.
    2. Disconnect the H145 CAN No. 2 junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY419659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 1 inspection.

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 2 J/C) 

    OK → REPLACE CAN NO. 2 JUNCTION CONNECTOR 

  23. CHECK FOR SHORT IN SUB BUS 1 LINE (ECU, SENSOR) 
    1. Reconnect the connector for the bus line that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus line resistance to change to 6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short) when it was disconnected).
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to +B or GND is connected. Refer to TERMINALS OF ECU [08/2013 - ] .
    3. Measure the resistance according to the value(s) in the table below.
      GTY419659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (CAN Junction Connector LH2)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • If the resistance becomes normal when the connector is disconnected from the ECU, there may be a short in the ECU.

    NG → REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

    OK → REPLACE CORRESPONDING ECU OR SENSOR 

  24. CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H9 main body ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY409051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Purpose
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω:
      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ:
      CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Rear view of wire harness connector
      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      HINT: 

      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 1 inspection.

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

    OK → See step   26 

  25. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ] 
  26. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2013 - ] 
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