Lexus IS250 · Service Manual BODY

TERMINALS OF ECU

System information


CHECK OUTER MIRROR CONTROL ECU LH
B120936E01
  1. Disconnect the M10 connector.

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

    Voltage:
    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    SIG (M10-3) - Body ground
    B - Body ground
    Ignition power supply
    Engine switch OFF → ON (IG)
    0 V → 10 to 14 V
    CPUB (M10-4) - Body ground
    G - Body ground
    +B power supply
    Always
    10 to 14 V
    BDR (M10-6) - Body ground
    L - Body ground
    +B power supply
    Always
    10 to 14 V


    Resistance:
    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    GND (M10-1) - Body ground
    W-B - Body ground
    Ground
    Always
    Below 1 Ω

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

  3. Reconnect the M10 connector.

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

    Voltage:
    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    MV (h1-1) - Body ground
    W - Body ground
    Outer mirror switch signal (Up or Right)
    Engine switch on (IG), Left/Right adjustment switch L side, Mirror switch OFF→ UP or Right
    0 V → 10 to 14 V
    VC (h1-5) - Body ground
    R-W - Body ground
    Power source for mirror position sensor
    Engine switch OFF → ON (IG)
    0 V → 0 to 5 V
    VSSR (h-6) - Body ground
    V - Body ground
    Vertical direction position signal
    Engine switch on (IG), Left/Right adjustment switch L side, Mirror switch uppermost position → lowermost position
    0 V → 1 to 3 V
    MH (h1-9) - Body ground
    R - Body ground
    Outer mirror switch signal (Left or Down)
    Engine switch on (IG), Left/Right adjustment switch L side, Mirror switch OFF→ LEFT or DOWN
    0 V → 10 to 14 V
    M+ (h1-10) - Body ground
    B - Body ground
    Outer mirror switch signal (Right or Down)
    Engine switch on (IG), Left/Right adjustment switch L side, Mirror switch OFF→ RIGHT or DOWN
    0 V → 10 to 14 V
    HSSR (h1-13) - Body ground
    LG - Body ground
    Horizontal direction position signal
    Engine switch on (IG), Left/Right adjustment switch L side, Mirror switch innermost position → outermost position
    0 V → 1 to 3 V


CHECK OUTER MIRROR CONTROL ECU RH
B120936E02
  1. Disconnect the L10 connector.

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

    Voltage:
    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    SIG (L10-3) - Body ground
    B - Body ground
    Ignition power supply
    Engine switch OFF → ON (IG)
    0 V → 10 to 14 V
    CPUB (L10-4) - Body ground
    G - Body ground
    +B power supply
    Always
    10 to 14 V
    BDR (L10-6) - Body ground
    L - Body ground
    +B power supply
    Always
    10 to 14 V


    Resistance:
    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    GND (L10-1) - Body ground
    W-B - Body ground
    Ground
    Always
    Below 1 Ω

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

  3. Reconnect the L10 connector.

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

    Voltage:
    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    MV (g1-1) - Body ground
    W - Body ground
    Outer mirror switch signal (Up or Right)
    Engine switch on (IG), Left/Right adjustment switch R side, Mirror switch OFF→ UP or Right
    0 V → 10 to 14 V
    VC (g1-5) - Body ground
    R-W - Body ground
    Power source for mirror position sensor
    Engine switch OFF → ON (IG)
    0 V → 0 to 5 V
    VSSR (g-6) - Body ground
    V - Body ground
    Vertical direction position signal
    Engine switch on (IG), Left/Right adjustment switch R side, Mirror switch uppermost position → lowermost position
    0 V → 1 to 3V
    MH (g1-9) - Body ground
    R - Body ground
    Outer mirror switch signal (Left or Down)
    Engine switch on (IG), Left/Right adjustment switch R side, Mirror switch OFF→ LEFT or DOWN
    0 V → 10 to 14 V
    M+ (g1-10) - Body ground
    B - Body ground
    Outer mirror switch signal (Right or Down)
    Engine switch on (IG), Left/Right adjustment switch R side, Mirror switch OFF→ RIGHT or DOWN
    0 V → 10 to 14 V
    HSSR (g1-13) - Body ground
    LG - Body ground
    Horizontal direction position signal
    Engine switch on (IG), Left/Right adjustment switch R side, Mirror switch innermost position → outermost position
    0 V → 1 to 3 V

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