Lexus IS250 · Service Manual BODY

TERMINALS OF ECU

System information


CHECK REAR SUNSHADE RELAY
B081618E03
  1. Disconnect the Q24 relay connector.

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

    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    IG (Q24-1) - E (Q24-5)
    Y - W-B
    Power source (IG)
    Engine switch off
    Below 1 V
    IG (Q24-1) - E (Q24-5)
    Y - W-B
    Power source (IG)
    Engine switch on (IG)
    10 to 14 V
    SW (Q24-3) - E (Q24-5)
    L - W-B
    Rear sunshade switch signal
    Engine switch on (IG)
    Rear sunshade switch OFF
    10 kΩ or higher
    SW (Q24-3) - E (Q24-5)
    L - W-B
    Rear sunshade switch signal
    Engine switch on (IG)
    Rear sunshade switch ON
    Below 1 Ω
    E (Q24-5) - 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 connector.

  3. Connect the Q24 relay connector.

  4. Measure the voltage of the wire harness side connector.

    Symbols (Terminal No.)
    Wiring Color
    Terminal Description
    Condition
    Specified Condition
    REV (Q24-2) - Body ground
    R - Body ground
    Reverse signal
    Engine switch on (IG), shift lever on except R
    Below 1 V
    REV (Q24-2) - Body ground
    R - Body ground
    Reverse signal
    Engine switch on (IG), shift lever on R
    10 to 14 V
    SW (Q24-3) - Body ground
    L - Body ground
    Rear sunshade switch signal
    Engine switch on (IG), rear sunshade switch not pushed
    10 to 14 V
    SW (Q24-3) - Body ground
    L - Body ground
    Rear sunshade switch signal
    Engine switch on (IG), rear sunshade switch pushed
    Below 1.5 V
    If the result is not as specified, there may be a malfunction on the wire harness side connector.

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