Lexus IS250 · Service Manual COMMUNICATION SYSTEM

TERMINALS OF ECU

System information


CHECK GATEWAY ECU

  1. Disconnect the gateway ECU connector.
    B120931E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (J76-1) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (J76-1) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    ACC (J76-2) - Body ground
    		 O - Body ground
    		 Power source (ACC)
    		 Engine switch: off
    		 Below 1 V
    ACC (J76-2) - Body ground
    		 O - Body ground
    		 Power source (ACC)
    		 Engine switch: on (IG)
    		 10 to 14 V
    BATT (J76-10) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    MPI1 (J76-4) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPI2 (J76-13) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPD1 (J76-3) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPD2 (J76-12) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    GND (J76-24) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK MAIN BODY ECU LH (COWL SIDE J/B LH)

  1. Disconnect the main body ECU LH (cowl side J/B LH) connectors.
    B110943E01

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (LK-6) - Body ground
    		 Y - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (LK-6) - Body ground
    		 Y - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    BKUP (LJ-23) - Body ground
    		 Y - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    MPXB (LD-18) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (LD-3) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    SGND (LD-8) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    SGND (LD-9) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (Q3-15) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (A30-17) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK MAIN BODY ECU RH (COWL SIDE J/B RH)

  1. Disconnect the main body ECU RH (cowl side J/B RH) connectors.
    B110944E01

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (RM-1) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (RM-1) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    *1ACC (RD-27) - Body ground
    *2ACC (RJ-22) - Body ground
    		 O - Body ground
    		 Power source (ACC)
    		 Engine switch: off
    		 Below 1 V
    *1ACC (RD-27) - Body ground
    *2ACC (RJ-22) - Body ground
    		 O - Body ground
    		 Power source (ACC)
    		 Engine switch: on (ACC)
    		 10 to 14 V
    ALTB (RA-15) - Body ground
    		 SB - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    BECU (RK-5) - Body ground
    		 G-R - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    BATB (RN-1) - Body ground
    		 R - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND2 (RD-11) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    GND2 (RD-7) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    GND2 (RA-4) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    GND2 (RA-5) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    GND1 (RD-17) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX5 (P1-5) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX6 (J75-20) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX4 (J75-19) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX1 (RA-20) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX1 (RJ-21) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (J75-21) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher

    HINT:
    1. *1: LHD
    2. *2: RHD

    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK TILT AND TELESCOPIC ECU

  1. Disconnect the tilt and telescopic ECU connector.
    B120934E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (J28-8) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (J28-8) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    ECUB (J28-9) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    +B (J28-2) - Body ground
    		 SB - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (J28-11) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (J28-5) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK POWER WINDOW MASTER SWITCH

  1. Disconnect the power window master switch connector.
    B120935E03

  2. Measure the voltage and the resistance of the wire harness side connector.

    for LHD 
    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SIG (M7-20) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    SIG (M7-20) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    CPUB (M7-9) - Body ground
    		 G - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    BDR (M7-10) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (M7-2) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (M7-7) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (M7-8) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    for RHD 
    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SIG (L17-20) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    SIG (L17-20) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    CPUB (L17-9) - Body ground
    		 G - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    BDR (L17-10) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (L17-2) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (L17-7) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (L17-8) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK OUTER MIRROR CONTROL ECU LH

  1. Disconnect the outer mirror control ECU LH connector.
    B120936E05

  2. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SIG (M10-3) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    SIG (M10-3) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    CPUB (M10-4) - Body ground
    		 G - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    BDR (M10-6) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (M10-1) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (M10-8) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK POWER SEAT CONTROL ECU RH

  1. Disconnect the power seat control ECU RH connectors.
    B120941E01

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (T7-4) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (T7-4) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    +B (T6-5) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    SYSB (T7-8) - Body ground
    		 P - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (T6-1) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (T7-1) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK CERTIFICATION ECU

  1. Disconnect the certification ECU connector.
    B120938E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (P33-18) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (P33-18) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    ACC (P33-19) - Body ground
    		 O - Body ground
    		 Power source (ACC)
    		 Engine switch: off
    		 Below 1 V
    ACC (P33-19) - Body ground
    		 O - Body ground
    		 Power source (ACC)
    		 Engine switch: on (IG)
    		 10 to 14 V
    +B1 (P33-1) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    E (P33-17) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (P33-27) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (P33-28) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK FRONT CONTROLLER

  1. Disconnect the front controller connectors.
    B120939E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    2E-3 - Body ground
    		 B-Y - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    2E-3 - Body ground
    		 B-Y - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    2E-4 - Body ground
    		 G-R - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    2F-1 - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    2F-6 - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    2F-5 - Body ground
    		 L - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK OUTER MIRROR CONTROL ECU RH

  1. Disconnect the outer mirror control ECU RH connector.
    B120940E01

  2. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SIG (L10-3) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    SIG (L10-3) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    CPUB (L10-4) - Body ground
    		 G - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    BDR (L10-6) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (L10-1) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (L10-8) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK POWER SEAT CONTROL ECU LH

  1. Disconnect the power seat control ECU LH connectors.
    B120937E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (U7-4) - Body ground
    		 Y - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (U7-4) - Body ground
    		 Y - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    +B (U6-5) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    SYSB (U7-8) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (U6-1) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (U7-1) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK SLIDING ROOF CONTROL ECU

  1. Disconnect the sliding roof control ECU connector.
    B120942E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (R6-6) - Body ground
    		 V - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (R6-6) - Body ground
    		 V - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    B (R6-5) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    E (R6-7) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (R6-10) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK RAIN SENSOR

  1. Disconnect the rain sensor connector.
    B120943E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SIG (R7-1) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    SIG (R7-1) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    MPX (R7-2) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK POWER SOURCE CONTROL ECU

  1. Disconnect the power source control ECU connector.
    B120944E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    AM1 (J55-33) - Body ground
    		 O - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    AM2 (J55-12) - Body ground
    		 O - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    MPX1 (J55-7) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (J55-24) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    GND2 (J55-6) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK WINDSHIELD WIPER SWITCH ASSEMBLY

  1. Disconnect the windshield wiper switch assembly connector.
    B120945E01

  2. Measure the resistance and voltage of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (J26-2) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (J26-2) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    B (J26-1) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    E (J26-5) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (J26-6) - Body ground
    		 GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK COMBINATION METER ECU

  1. Disconnect the combination meter ECU connector.
    B120946E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG+ (J34-12) - Body ground
    		 O - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG+ (J34-12) - Body ground
    		 O - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    B (J34-23) - Body ground
    		 L - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    B (J34-24) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    E2 (J34-1) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    ES (J34-13) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX+ (J34-6) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX- (J34-18) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK CLEARANCE WARNING ECU

  1. Disconnect the clearance warning ECU connector.
    B120947E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (Q37-8) - Body ground
    		 Y - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (Q37-8) - Body ground
    		 Y - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    E (Q37-27) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    M+ (Q37-26) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK AFS ECU

  1. Disconnect the AFS ECU connector.
    B120948E01

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (A27-2) - Body ground
    		 B-O - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG (A27-2) - Body ground
    		 B-O - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    MPX1 (A27-5) - Body ground
    		 BR-R - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (A27-6) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    E1 (A27-1) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK AIR CONDITIONING AMPLIFIER

  1. Disconnect the air conditioning amplifier connector.
    B120949E01

  2. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG+ (J58-21) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: off
    		 Below 1 V
    IG+ (J58-21) - Body ground
    		 B - Body ground
    		 Power source (IG)
    		 Engine switch: on (IG)
    		 10 to 14 V
    B (J58-1) - Body ground
    		 Y - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    MPX+ (J58-30) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX- (J58-31) - Body ground
    		 BR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    GND (J58-20) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω


CHECK DOUBLE DOOR LOCK ECU
B064460E05

  1. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    +B (P34-1) - Body ground
    		 R - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    CPUB (P34-7) - Body ground
    		 LG - Body ground
    		 Power source (+B)
    		 Always
    		 10 to 14 V
    GND (P34-14) - Body ground
    		 W-B - Body ground
    		 Ground for main power supply
    		 Always
    		 Below 1 Ω
    MPX1 (P34-9) - Body ground
    		 *1LG - Body ground
    *2GR - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher

    HINT:
    1. *1: LHD
    2. *2: RHD

    If the result is not as specified, there may be a malfunction on the wire harness side.

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