CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Network Gateway ECU)

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area Note
U1002 Lost Communication with Gateway Module (Network Gateway ECU) The network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 2.

  • Open or short in sub bus 2 main lines or connector

  • Short in sub bus 2 branch lines or connector

  • Network gateway ECU

  • Inner rear view mirror assembly

    (w/ Automatic High Beam System)

  • Parking assist ECU

    (w/ Panoramic View Monitor System)

  • Telematics transceiver

    (w/ Manual (SOS) Switch)

  • Open or short in No. 2 CAN junction connector

  • Open or short in No. 2 CAN junction terminal

Tech Tips

The network gateway ECU stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 2.

Tech Tips

This diagnostic procedure is for when DTC U1002 is output by the network gateway ECU (GTS display: Gateway).

WIRING DIAGRAM

A01UDZ6E01

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 21 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK SUB BUS 2


    1. Disconnect the cable from the negative (-) battery terminal.

    2. A01UDWNC33
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G34-13 (CA2H) - G34-12 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or higher: Open circuit in main bus lines
      G34-13 (CA2H) - G34-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      G34-12 (CA2L) - G34-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G34-13 (CA2H) - G34-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G34-12 (CA2L) - G34-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus lines B
      Short circuit between bus lines C

      • Short to ground

      • +B short

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU) Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINE (NETWORK GATEWAY ECU) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Reconnect the cable to the negative (-) battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTCs.


      Body Electrical > Gateway > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG).

    8. Check for DTCs.


      Body Electrical > Gateway > Trouble Codes
      Result
      Result Proceed to
      DTC U1002 is not output from the network gateway ECU (GTS display: Gateway) A
      DTC U1002 is output from the network gateway ECU (GTS display: Gateway) B

    A

    SYMPTOM SIMULATION Click here

    B

    REPLACE NETWORK GATEWAY ECU Click here

  3. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU)


    1. A01UFJ3C07
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the G34 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-13 (CA2H) - G34-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

  4. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect the G34 network gateway ECU connector.

    2. B006ML5C59
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the G96 No. 2 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G96-3 (CANH) - G96-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

  5. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the G96 No. 2 CAN junction terminal connector.

    2. Disconnect the G88 and G89 No. 2 CAN junction connectors.

      Tech Tips


      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

      • Before disconnecting the connectors, make a note of where they are connected.

      • 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.

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

      A01UF46C07
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Terminal
      *c to Network Gateway ECU - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      G88 V W No. 2 CAN junction terminal
      G89 BE W Network gateway ECU
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G88-1 (CANH) - G88-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      G89-1 (CANH) - G89-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Network gateway ECU
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal main bus lines) B
      NG (Network gateway ECU main bus lines) C

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR)

  6. CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU)


    1. A01UFJ3C07
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the G34 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-13 (CA2H) - G34-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

  7. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect the G34 network gateway ECU connector.

    2. B006ML5C59
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the G96 No. 2 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G96-3 (CANH) - G96-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

  8. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR MAIN BUS LINES)


    1. Reconnect the G96 No. 2 CAN junction terminal connector.

    2. Disconnect the G88 and G89 No. 2 CAN junction connectors.

      Tech Tips


      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

      • Before disconnecting the connectors, make a note of where they are connected.

      • 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.

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

      A01UF46C07
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Terminal
      *c to Network Gateway ECU - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      G88 V W No. 2 CAN junction terminal
      G89 BE W Network gateway ECU
      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G88-1 (CANH) - G88-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      G89-1 (CANH) - G89-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Network gateway ECU
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal main bus lines) B
      NG (Network gateway ECU main bus lines) C

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR)

    A

  9. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the G88 and G89 No. 2 CAN junction connectors.

    2. Disconnect the G92, G93 and G95 No. 2 CAN junction connectors.

      Tech Tips


      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

      • Before disconnecting the connectors, make a note of where they are connected.

      • 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.

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

      A01UD0TC01
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b

      to Parking Assist ECU

      (w/ Panoramic View Monitor System)
      *c

      to Inner Rear View Mirror Assembly

      (w/ Automatic High Beam System)

      		 *d

      to Telematics Transceiver

      (w/ Manual (SOS) Switch)
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      G92 Y W Parking assist ECU*1
      G93 R W Inner rear view mirror assembly*2
      G95 LG W Telematics transceiver*3

      *1: w/ Panoramic View Monitor System

      *2: w/ Automatic High Beam System

      *3: w/ Manual (SOS) Switch

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G92-1 (CANH) - G92-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Parking assist ECU*1
      G93-1 (CANH) - G93-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inner rear view mirror assembly*2
      G95-1 (CANH) - G95-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Telematics transceiver*3
      *1: w/ Panoramic View Monitor System
      *2: w/ Automatic High Beam System
      *3: w/ Manual (SOS) Switch
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    NG

  10. CHECK FOR SHORT IN SUB BUS 2 LINES (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

      Click here

    3. A01UDWNC34
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-13 (CA2H) - G34-12 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Tech Tips

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

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

  11. CHECK FOR SHORT IN SUB BUS 2 LINE (NETWORK GATEWAY ECU)


    1. Disconnect the G34 network gateway ECU connector.

    2. A01UFJ3C08
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G34-13 (CA2H) - G34-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      G34-12 (CA2L) - G34-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G34-13 (CA2H) - G34-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G34-12 (CA2L) - G34-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

  12. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect the G34 network gateway ECU connector.

    2. A01UENIC28
      *1 DLC3
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the G96 No. 2 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G96-3 (CANH) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      G96-2 (CANL) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G96-3 (CANH) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G96-2 (CANL) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

  13. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION CONNECTOR MAIN BUS LINES)


    1. Reconnect the G96 No. 2 CAN junction terminal connector.

    2. Disconnect the G88 and G89 No. 2 CAN junction connectors.

      Tech Tips


      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

      • Before disconnecting the connectors, make a note of where they are connected.

      • 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.

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

      A01UE9XC01
      *1 DLC3 - -
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Terminal
      *c to Network Gateway ECU - -
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      G88 V W No. 2 CAN junction terminal
      G89 BE W Network gateway ECU
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      G88-1 (CANH) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 2 CAN junction terminal
      G88-2 (CANL) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G89-1 (CANH) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Network gateway ECU
      G89-2 (CANL) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G88-1 (CANH) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 2 CAN junction terminal
      G88-2 (CANL) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G89-1 (CANH) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Network gateway ECU
      G89-2 (CANL) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal main bus lines) B
      NG (Network gateway ECU main bus lines) C

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR)

    A

  14. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the G88 and G89 No. 2 CAN junction connectors.

    2. Disconnect the G92, G93 and G95 No. 2 CAN junction connectors.

      Tech Tips


      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

      • Before disconnecting the connectors, make a note of where they are connected.

      • 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.

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

      A01UCMYC01
      *1 DLC3 - -
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b

      to Parking Assist ECU

      (w/ Panoramic View Monitor System)
      *c

      to Inner Rear View Mirror Assembly

      (w/ Automatic High Beam System)

      		 *d

      to Telematics Transceiver

      (w/ Manual (SOS) Switch)
      Wiring Color:
      Code Color (CANH Side) Color (CANL Side) Connected to
      G92 Y W Parking assist ECU*1
      G93 R W Inner rear view mirror assembly*2
      G95 LG W Telematics transceiver*3

      *1: w/ Panoramic View Monitor System

      *2: w/ Automatic High Beam System

      *3: w/ Manual (SOS) Switch

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      G92-1 (CANH) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Parking assist ECU*1
      G92-2 (CANL) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G93-1 (CANH) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Inner rear view mirror assembly*2
      G93-2 (CANL) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G95-1 (CANH) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Telematics transceiver*3
      G95-2 (CANL) - G9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G92-1 (CANH) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Parking assist ECU*1
      G92-2 (CANL) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G93-1 (CANH) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Inner rear view mirror assembly*2
      G93-2 (CANL) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G95-1 (CANH) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Telematics transceiver*3
      G95-2 (CANL) - G9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      *1: w/ Panoramic View Monitor System
      *2: w/ Automatic High Beam System
      *3: w/ Manual (SOS) Switch

      Tech Tips


      • 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    NG

  15. CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B or shorted to GND is connected.

      Click here

    3. A01UDWNC33
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G34-13 (CA2H) - G34-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      G34-12 (CA2L) - G34-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      G34-13 (CA2H) - G34-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G34-12 (CA2L) - G34-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • 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 2 inspection.

      • If the resistance becomes normal when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR