RX400h · Service Manual BODY

TERMINALS OF ECU

System information


POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU)

  1. Disconnect the P30 and P31 connectors.
    B066387E03

  2. Check the voltage of each terminal of the wire harness side connectors.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG(P30-4) - GND(P31-1)
    		 Y - W-B
    		 Ignition switch signal
    		 Ignition switch off → ignition switch on
    		 Below 1 V → 10 to 14 V
    SYSB(P30-8) - GND(P31-1)
    		 GR - W-B
    		 Power source
    		 Always
    		 10 to 14 V
    +B(P31-5) - GND(P31-1)
    		 LG - W-B
    		 Battery
    		 Always
    		 10 to 14 V
    If the result is not as specified, there may be a malfunction in the wire harness side.

  3. Check the resistance of each terminal of the wire harness side connectors.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    GND(P31-1) - Body ground
    		 W-B - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    If the result is not as specified, there may be a malfunction in the wire harness side.

  4. Reconnect the P30 and P31 connectors.

  5. Check the voltage of each terminal of the connectors.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    MPX1(P30-1) - GND(P31-1)
    		 W - W-B
    		 Multiplex communication signal circuit
    		 Ignition switch on
    		 Pulse generation
    SLD+(P31-2) - GND(P31-1)
    		 L - W-B
    		 Sliding motor signal (Forward)
    		 Seat moving forward using sliding switch → Other conditions
    		 10 to 14 V → Below 1 V
    SLD-(P31-3) - GND(P31-1)
    		 Y - W-B
    		 Sliding motor signal (Rearward)
    		 Seat moving rearward using sliding switch → Other conditions
    		 10 to 14 V → Below 1 V
    FRV-(P31-4) - GND(P31-1)
    		 B - W-B
    		 Front vertical motor signal (Downward)
    		 Seat cushion front portion lowering using front vertical switch → Other conditions
    		 10 to 14 V → Below 1 V
    FRV+(P31-6) - GND(P31-1)
    		 G - W-B
    		 Front vertical motor signal (Upward)
    		 Seat cushion front portion rising using front vertical switch → Other conditions
    		 10 to 14 V → Below 1 V
    LFT+(P31-7) - GND(P31-1)
    		 W - W-B
    		 Lifter motor signal (Upward)
    		 Seat rising using lifter switch → Other conditions
    		 10 to 14 V → Below 1 V
    RCL+(P31-8) - GND(P31-1)
    		 P - W-B
    		 Reclining motor signal (Forward)
    		 Seatback moving forward using reclining switch → Other conditions
    		 10 to 14 V → Below 1 V
    LFT-(P31-9) - GND(P31-1)
    		 V - W-B
    		 Lifter motor signal (Downward)
    		 Seat lowering using lifter switch → Other conditions
    		 10 to 14 V → Below 1 V
    RCL-(P31-10) - GND(P31-1)
    		 BR - W-B
    		 Reclining motor signal (Rearward)
    		 Seatback moving rearward using reclining switch → Other conditions
    		 10 to 14 V → Below 1 V
    If the result is not as specified, the position control ECU and switch assembly may be malfunctioning.


POWER WINDOW REGULATOR SWITCH ASSEMBLY (POWER WINDOW MASTER SWITCH)

  1. Disconnect the P19 connector.
    B115721E04

  2. Check the voltage of each terminal of the wire harness side connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    CPUB(P19-9) - GND(P19-2)
    		 L-B - W-B
    		 Power source
    		 Always
    		 10 to 14 V
    BDR(P19-10) - GND(P19-2)
    		 G - W-B
    		 Power window motor power source
    		 Always
    		 10 to 14 V
    SIG(P19-20) - GND(P19-2)
    		 BR - W-B
    		 Ignition switch signal
    		 Ignition switch off → ignition switch on
    		 Below 1 V → 10 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Check the resistance of each terminal of the wire harness side connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    GND(P19-2) - 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.

  4. Reconnect the P19 connector.

  5. Check the voltage of each terminal of the connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    MM(P19-3) - GND(P19-2)
    		 LG - W-B
    		 SET switch signal
    		 SET switch is not pushed → pushed
    		 10 to 14 V → Below 1 V
    M1(P19-13) - GND(P19-2)
    		 G - W-B
    		 SW1 switch signal
    		 SW1 switch is not pushed → pushed
    		 10 to 14 V → Below 1 V
    M2(P19-17) - GND(P19-2)
    		 V - W-B
    		 SW2 switch signal
    		 SW2 switch is not pushed → pushed
    		 10 to 14 V → Below 1 V
    If the result is not as specified, the power window regulator switch assembly may be malfunctioning.

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