2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

Communication System. Lexus Is250, Is220D. Gse20 Ale20
Can Communication. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR SHORT IN CAN BUS LINES (DLC3 BRANCH LINE)

RECONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS LINES (BRANCH LINE)

CHECK FOR SHORT IN CAN BUS LINES (GATEWAY ECU MAIN BUS LINE)

CHECK FOR SHORT IN CAN BUS LINES (ECM MAIN BUS LINE)

CHECK CAN LH J/C

RECONNECT CONNECTOR

CHECK CAN RH J/C

RECONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS LINES

RECONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS LINES (GATEWAY ECU)

RECONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS LINES (ECM)

2AD-FHV CAN COMMUNICATION SYSTEM (for LHD) - Short in CAN Bus Lines


DESCRIPTION

The CAN bus lines are considered to be shorted when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

Symptom
Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.
  1. Short in CAN bus lines
  2. Skid control ECU
  3. Steering angle sensor
  4. Yaw rate sensor
  5. ECM
  6. Gateway ECU
  7. Power steering ECU
  8. Television camera ECU
  9. Center airbag sensor
  10. CAN LH J/C
  11. CAN RH J/C

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines


Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines


INSPECTION PROCEDURE

1.CHECK FOR SHORT IN CAN BUS LINES (DLC3 BRANCH LINE)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Turn the engine switch off.

  1. Disconnect the DLC3 branch line connector (J8) from the CAN LH J/C B side (without earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		1 MΩ or higher


NG
REPAIR OR REPLACE DLC3 BRANCH LINE OR CONNECTOR
OK


2.RECONNECT CONNECTOR

  1. Reconnect the DLC3 branch line connector (J8) to the CAN LH J/C B side (without earth terminal).


NEXT


3.CHECK FOR SHORT IN CAN BUS LINES (BRANCH LINE)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.



  1. While observing the resistance value shown on the tester, disconnect connectors J1, J4, J5, J6, J82 and J94 from the CAN LH J/C or CAN RH J/C one by one until the resistance becomes normal (between 54 and 69 Ω).

    HINT:
    Disconnect the branch line connectors other than those of the DLC3.

    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines


    Wiring color:
    CAN LH J/C A Side (with Earth Terminal)
    		Code
    		Color (CANH Side)
    		Color (CANL Side)
    Steering angle sensor
    		J1
    		P
    		W
    ECM
    		J2
    		B
    		W
    Center airbag sensor
    		J4
    		R
    		W

    Wiring color:
    CAN LH J/C B Side (without Earth Terminal)
    		Code
    		Color (CANH Side)
    		Color (CANL Side)
    Yaw rate sensor
    		J5
    		P
    		W
    Skid control ECU
    		J6
    		R
    		W
    CAN main bus line (bus line connecting CAN LH J/C and CAN RH J/C)
    		J7
    		B
    		W
    DLC3
    		J8
    		G
    		W

    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines


    Wiring color:
    CAN RH J/C A Side (with Earth Terminal)
    		Code
    		Color (CANH Side)
    		Color (CANL Side)
    CAN main bus line (bus line connecting CAN RH J/C and CAN LH J/C)
    		J81
    		B
    		W
    Power steering ECU
    		J82
    		P
    		W
    Television camera ECU
    		J94
    		L
    		W

    Wiring color:
    CAN RH J/C B Side (without Earth Terminal)
    		Code
    		Color (CANH Side)
    		Color (CANL Side)
    Gateway ECU
    		J84
    		B
    		W
    NOTICE:
    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 in the branch lines.)
    		A
    The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short in one or more of the branch lines.)
    		B

  1. When there is a short in one or more of the branch lines:

    1. Reconnect all of the connectors to the CAN J/C, 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 one branch line only.

      HINT:
      1. The connectors connected to the CAN J/C can be distinguished according to the color of the communication bus lines and the shape of the connectors.
      2. Reconnecting the connectors to non-specified positions on the CAN J/C does not affect system operation. However, it is preferred to reconnect the connectors to their specified positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


B
Go to step 9
A


4.CHECK FOR SHORT IN CAN BUS LINES (GATEWAY ECU MAIN BUS LINE)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Disconnect the gateway ECU main bus line connector (J84) from the CAN RH J/C B side (without earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		108 to 132 Ω

    Result:

    Symptom
    		Proceed to
    The resistance is still below 54 Ω when the gateway ECU connector is disconnected. (There are no shorts in the gateway ECU main bus lines.)
    		A
    The resistance falls within the specified range (between 108 and 132 Ω) (either of the terminating resistances is normal) when the gateway ECU connector is disconnected. (There is a short in the gateway ECU main bus lines.)
    		B


B
Go to step 11
A


5.CHECK FOR SHORT IN CAN BUS LINES (ECM MAIN BUS LINE)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Disconnect the ECM main bus line connector (J2) from the CAN LH J/C A side (with earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		1 MΩ or higher
    HINT:
    Measure the resistance with the gateway ECU main bus line connector (J84) disconnected.

    Result:

    Symptom
    		Proceed to
    The resistance is still below 1 MΩ when the ECM connector is disconnected. (There are no shorts in the ECM main bus lines.)
    		A
    The resistance becomes 1 MΩ or more when the ECM connector is disconnected. (There is a short in the ECM main bus lines.)
    		B


B
Go to step 13
A


6.CHECK CAN LH J/C


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Disconnect the CAN main bus line connector (J7) from the CAN LH J/C B side (without earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		1 MΩ or higher


NG
REPLACE CAN LH J/C
OK


7.RECONNECT CONNECTOR

  1. Reconnect the CAN main bus line connector (J7) to the CAN LH J/C B side (without earth terminal).


NEXT


8.CHECK CAN RH J/C


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Disconnect the CAN main bus line connector (J81) from the CAN RH J/C A side (with earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		1 MΩ or higher


OK
REPLACE CAN RH J/C
NG

REPAIR OR REPLACE CAN MAIN BUS LINE (CAN LH J/C - CAN RH J/C)

9.RECONNECT CONNECTOR

  1. Reconnect the connector for the short-circuited branch line to the CAN J/C (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).


NEXT


10.CHECK FOR SHORT IN CAN BUS LINES


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. 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)

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		1 MΩ or higher
    HINT:
    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).


NG
REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR
OK

REPLACE CORRESPONDING ECU OR SENSOR

11.RECONNECT CONNECTOR

  1. Reconnect the gateway ECU main bus line connector (J84) to the CAN RH J/C B side (without earth terminal).


NEXT


12.CHECK FOR SHORT IN CAN BUS LINES (GATEWAY ECU)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Disconnect the gateway ECU connector (J76).

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		108 to 132 Ω
    HINT:
    If the resistance becomes normal (between 108 to 132 Ω) when the connector is disconnected, there may be a short in the gateway ECU.


NG
REPAIR OR REPLACE CAN MAIN BUS LINE (GATEWAY ECU MAIN BUS LINE)
OK

REPLACE GATEWAY ECU

13.RECONNECT CONNECTOR

  1. Reconnect the ECM main bus line connector (J2) to the CAN LH J/C A side (with earth terminal).


NEXT


14.CHECK FOR SHORT IN CAN BUS LINES (ECM)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).2Ad-Fhv Can Communication System (For Lhd) Short In Can Bus Lines

  1. Disconnect the ECM connector (A49).

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    J21-6 (CANH) - J21-14 (CANL)
    		Engine switch off
    		1 MΩ or higher
    HINT:
    1. Measure the resistance with the gateway ECU main bus line connector (J84) disconnected.
    2. If the resistance changes to 1 MΩ or more when the connector is disconnected, there may be a short in the ECM.


NG
REPAIR OR REPLACE CAN MAIN BUS LINE (ECM MAIN BUS LINE)
OK

REPLACE ECM