Lexus IS250 · Service Manual BODY

TERMINALS OF ECU

System information


INSPECT FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU)
B107920E10

  1. Disconnect the U7 and U6 ECU connectors.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (U7-4) - GND (U6-1)
    		 Y - W-B
    		 Engine switch signal
    		 Engine switch off
    		 Below 1 V
    IG (U7-4) - GND (U6-1)
    		 Y - W-B
    		 Engine switch signal
    		 Engine switch on (IG)
    		 10 to 14 V
    +B (U6-5) - GND (U6-1)
    		 L - W-B
    		 Power source
    		 Always
    		 10 to 14 V
    SYSB (U7-8) - GND (U6-1)
    		 LG - W-B
    		 System power source
    		 Always
    		 10 to 14 V
    GND (U6-1) - 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 U7 and U6 ECU connectors.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SLD+ (U6-2) - GND (U6-1)
    		 B - W-B
    		 Sliding motor signal (forward)
    		 Slide switch OFF
    		 Below 1 V
    SLD+ (U6-2) - GND (U6-1)
    		 B - W-B
    		 Sliding motor signal (forward)
    		 Slide switch FRONT ON
    		 10 to 14 V
    SLD- (U6-3) - GND (U6-1)
    		 G - W-B
    		 Sliding motor signal (rearward)
    		 Slide switch OFF
    		 Below 1 V
    SLD- (U6-3) - GND (U6-1)
    		 G - W-B
    		 Sliding motor signal (rearward)
    		 Slide switch REAR ON
    		 10 to 14 V
    FRV+ (U6-6) - GND (U6-1)
    		 W - W-B
    		 Front vertical motor signal (upward)
    		 Front vertical switch OFF
    		 Below 1 V
    FRV+ (U6-6) - GND (U6-1)
    		 W - W-B
    		 Front vertical motor signal (upward)
    		 Front vertical switch UP ON
    		 10 to 14 V
    FRV- (U6-4) - GND (U6-1)
    		 R - W-B
    		 Front vertical motor signal (downward)
    		 Front vertical switch OFF
    		 Below 1 V
    FRV- (U6-4) - GND (U6-1)
    		 R - W-B
    		 Front vertical motor signal (downward)
    		 Front vertical switch DOWN ON
    		 10 to 14 V
    LFT+ (U6-7) - GND (U6-1)
    		 Y - W-B
    		 Lifter motor signal (upward)
    		 Lifter switch OFF
    		 Below 1 V
    LFT+ (U6-7) - GND (U6-1)
    		 Y - W-B
    		 Lifter motor signal (upward)
    		 Lifter switch UP ON
    		 10 to 14 V
    LFT- (U6-9) - GND (U6-1)
    		 LG - W-B
    		 Lifter motor signal (downward)
    		 Lifter switch OFF
    		 Below 1 V
    LFT- (U6-9) - GND (U6-1)
    		 LG - W-B
    		 Lifter motor signal (downward)
    		 Lifter switch DOWN ON
    		 10 to 14 V
    RCL+ (U6-8) - GND (U6-1)
    		 BR - W-B
    		 Reclining motor signal (forward)
    		 Reclining switch OFF
    		 Below 1 V
    RCL+ (U6-8) - GND (U6-1)
    		 BR - W-B
    		 Reclining motor signal (forward)
    		 Reclining switch FRONT ON
    		 10 to 14 V
    RCL- (U6-10) - GND (U6-1)
    		 GR - W-B
    		 Reclining motor signal (rearward)
    		 Reclining switch OFF
    		 Below 1 V
    RCL- (U6-10) - GND (U6-1)
    		 GR - W-B
    		 Reclining motor signal (rearward)
    		 Reclining switch REAR ON
    		 10 to 14 V
    If the result is not as specified, the front power seat switch LH (position control ECU) may have a malfunction.


INSPECT FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU)
B107920E11

  1. Disconnect the T6 and T7 ECU connectors.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IG (T7-4) - GND (T6-1)
    		 B - W-B
    		 Engine switch signal
    		 Engine switch off
    		 Below 1 V
    IG (T7-4) - GND (T6-1)
    		 B - W-B
    		 Engine switch signal
    		 Engine switch on (IG)
    		 10 to 14 V
    +B (T6-5) - GND (T6-1)
    		 L - W-B
    		 Power source
    		 Always
    		 10 to 14 V
    SYSB (T7-8) - GND (T6-1)
    		 P - W-B
    		 System power source
    		 Always
    		 10 to 14 V
    GND (T6-1) - 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 T6 and T7 ECU connectors.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    SLD+ (T6-2) - GND (T6-1)
    		 B - W-B
    		 Sliding motor signal (forward)
    		 Slide switch OFF
    		 Below 1 V
    SLD+ (T6-2) - GND (T6-1)
    		 B - W-B
    		 Sliding motor signal (forward)
    		 Slide switch FRONT ON
    		 10 to 14 V
    SLD- (T6-3) - GND (T6-1)
    		 G - W-B
    		 Sliding motor signal (rearward)
    		 Slide switch OFF
    		 Below 1 V
    SLD- (T6-3) - GND (T6-1)
    		 G - W-B
    		 Sliding motor signal (rearward)
    		 Slide switch REAR ON
    		 10 to 14 V
    FRV+ (T6-6) - GND (T6-1)
    		 W - W-B
    		 Front vertical motor signal (upward)
    		 Front vertical switch OFF
    		 Below 1 V
    FRV+ (T6-6) - GND (T6-1)
    		 W - W-B
    		 Front vertical motor signal (upward)
    		 Front vertical switch UP ON
    		 10 to 14 V
    FRV- (T6-4) - GND (T6-1)
    		 R - W-B
    		 Front vertical motor signal (downward)
    		 Front vertical switch OFF
    		 Below 1 V
    FRV- (T6-4) - GND (T6-1)
    		 R - W-B
    		 Front vertical motor signal (downward)
    		 Front vertical switch DOWN ON
    		 10 to 14 V
    LFT+ (T6-7) - GND (T6-1)
    		 Y - W-B
    		 Lifter motor signal (upward)
    		 Lifter switch OFF
    		 Below 1 V
    LFT+ (T6-7) - GND (T6-1)
    		 Y - W-B
    		 Lifter motor signal (upward)
    		 Lifter switch UP ON
    		 10 to 14 V
    LFT- (T6-9) - GND (T6-1)
    		 LG - W-B
    		 Lifter motor signal (downward)
    		 Lifter switch OFF
    		 Below 1 V
    LFT- (T6-9) - GND (T6-1)
    		 LG - W-B
    		 Lifter motor signal (downward)
    		 Lifter switch DOWN ON
    		 10 to 14 V
    RCL+ (T6-8) - GND (T6-1)
    		 BR - W-B
    		 Reclining motor signal (forward)
    		 Reclining switch OFF
    		 Below 1 V
    RCL+ (T6-8) - GND (T6-1)
    		 BR - W-B
    		 Reclining motor signal (forward)
    		 Reclining switch FRONT ON
    		 10 to 14 V
    RCL- (T6-10) - GND (T6-1)
    		 GR - W-B
    		 Reclining motor signal (rearward)
    		 Reclining switch OFF
    		 Below 1 V
    RCL- (T6-10) - GND (T6-1)
    		 GR - W-B
    		 Reclining motor signal (rearward)
    		 Reclining switch REAR ON
    		 10 to 14 V
    If the result is not as specified, the front power seat switch RH (position control ECU) may have a malfunction.


CHECK OUTER MIRROR CONTROL ECU LH
E106666E31

  1. Disconnect the M10 ECU connector.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    GND (M10-1) - Body ground
    		 W-B - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    CPUB (M10-4) - GND (M10-1)
    		 G - W-B
    		 Battery (ECU power source)
    		 Always
    		 10 to 14 V
    SIG (M10-3) - GND (M10-1)
    		 B - W-B
    		 Engine switch (IG) power supply
    		 Engine switch off
    		 Below 1 V
    SIG (M10-3) - GND (M10-1)
    		 B - W-B
    		 Engine switch (IG) power supply
    		 Engine switch on (IG)
    		 10 to 14 V
    BDR (M10-6) - GND (M10-1)
    		 L - W-B
    		 Battery (ECU power source)
    		 Always
    		 10 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the M10 ECU connector.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    MSWE (M10-26) - GND (M10-1)
    		 O - W-B
    		 Ground for seat memory switch
    		 Always
    		 Below 1 Ω
    MM (M10-25) - MSWE (M10-26)
    		 W - O
    		 SET switch signal
    		 SET switch OFF
    		 10 to 14 V
    MM (M10-25) - MSWE (M10-26)
    		 W - O
    		 SET switch signal
    		 SET switch ON
    		 Below 1 V
    M1 (M10-22) - MSWE (M10-26)
    		 LG - O
    		 M1 switch signal
    		 M1 switch OFF
    		 10 to 14 V
    M1 (M10-22) - MSWE (M10-26)
    		 LG - O
    		 M1 switch signal
    		 M1 switch ON
    		 Below 1 V
    M2 (M10-23) - MSWE (M10-26)
    		 R - O
    		 M2 switch signal
    		 M2 switch OFF
    		 10 to 14 V
    M2 (M10-23) - MSWE (M10-26)
    		 R - O
    		 M2 switch signal
    		 M2 switch ON
    		 Below 1 V
    M3 (M10-24) - MSWE (M10-26)
    		 Y - O
    		 M3 switch signal
    		 M3 switch OFF
    		 10 to 14 V
    M3 (M10-24) - MSWE (M10-26)
    		 Y - O
    		 M3 switch signal
    		 M3 switch ON
    		 Below 1 V
    If the result is not as specified, the outer mirror control ECU LH may have a malfunction.


CHECK OUTER MIRROR CONTROL ECU RH
E106666E32

  1. Disconnect the L10 ECU connector.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    GND (L10-1) - Body ground
    		 W-B - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    CPUB (L10-4) - GND (L10-1)
    		 G - W-B
    		 Battery (ECU power source)
    		 Always
    		 10 to 14 V
    SIG (L10-3) - GND (L10-1)
    		 B - W-B
    		 Engine switch (IG) power supply
    		 Engine switch off
    		 Below 1 V
    SIG (L10-3) - GND (L10-1)
    		 B - W-B
    		 Engine switch (IG) power supply
    		 Engine switch on (IG)
    		 10 to 14 V
    BDR (L10-6) - GND (L10-1)
    		 L - W-B
    		 Battery (ECU power source)
    		 Always
    		 10 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the L10 ECU connector.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    MSWE (L10-26) - GND (L10-1)
    		 W - W-B
    		 Ground for seat memory switch
    		 Always
    		 Below 1 Ω
    MM (L10-25) - MSWE (L10-26)
    		 Y - W
    		 SET switch signal
    		 SET switch OFF
    		 10 to 14 V
    MM (L10-25) - MSWE (L10-26)
    		 Y - W
    		 SET switch signal
    		 SET switch ON
    		 Below 1 V
    M1 (L10-22) - MSWE (L10-26)
    		 O - W
    		 M1 switch signal
    		 M1 switch OFF
    		 10 to 14 V
    M1 (L10-22) - MSWE (L10-26)
    		 O - W
    		 M1 switch signal
    		 M1 switch ON
    		 Below 1 V
    M2 (L10-23) - MSWE (L10-26)
    		 LG - W
    		 M2 switch signal
    		 M2 switch OFF
    		 10 to 14 V
    M2 (L10-23) - MSWE (L10-26)
    		 LG - W
    		 M2 switch signal
    		 M2 switch ON
    		 Below 1 V
    M3 (L10-24) - MSWE (L10-26)
    		 R - W
    		 M3 switch signal
    		 M3 switch OFF
    		 10 to 14 V
    M3 (L10-24) - MSWE (L10-26)
    		 R - W
    		 M3 switch signal
    		 M3 switch ON
    		 Below 1 V
    If the result is not as specified, the outer mirror control ECU RH may have a malfunction.

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