Lexus IS250 · Service Manual BODY ELECTRICAL

TERMINALS OF ECU

System information


CHECK CERTIFICATION ECU
B108931E04

  1. Disconnect the P33 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
    +B1 (P33-1) - Body ground
    		 L - Body ground
    		 +B power supply
    		 Always
    		 10 to 14 V
    IG (P33-18) - Body ground
    		 B - Body ground
    		 Ignition power supply
    		 Engine switch off
    		 Below 1 V
    IG (P33-18) - Body ground
    		 B - Body ground
    		 Ignition power supply
    		 Engine switch on (IG)
    		 10 to 14 V
    E (P33-17) - Body ground
    		 W-B - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    ACC (P33-19) - Body ground
    		 O - Body ground
    		 ACC power supply
    		 Engine switch off
    		 Below 1 V
    ACC (P33-19) - Body ground
    		 O - Body ground
    		 ACC power supply
    		 Engine switch on (ACC)
    		 10 to 14 V
    TSW1 (P33-3) - Body ground
    		 Y - Body ground
    		 Entry lock switch signal
    		 Front lock switch LH not pushed
    		 10 KΩ or higher
    TSW1 (P33-3) - Body ground
    		 Y - Body ground
    		 Entry lock switch signal
    		 Front lock switch LH pushed
    		 Below 1 Ω
    TSW2 (P33-4) - Body ground
    		 BR - Body ground
    		 Entry lock switch signal
    		 Front lock switch RH not pushed
    		 10 KΩ or higher
    TSW2 (P33-4) - Body ground
    		 BR - Body ground
    		 Entry lock switch signal
    		 Front lock switch RH pushed
    		 Below 1 Ω
    LIN (P33-10) - Body ground
    		 V - Body ground
    		 LIN line
    		 Always
    		 10 kΩ or higher
    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
    AGND (P33-40) - Body ground
    		 LG - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    1. If the result is not as specified, the wire harness side may have a malfunction.

  3. Reconnect the P33 ECU connector.

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

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    CLG1 (P33-33) - CG1B (P33-34)
    		 R - BR
    		 Door electrical key oscillator (front LH) sensor signal
    		 All doors closed, all doors locked and engine switch off
    		 Alternating between 5 V and below 1 V
    CLG1 (P33-33) - CG1B (P33-34)
    		 R - BR
    		 Door electrical key oscillator (front LH) sensor signal
    		 Door unlocked or door open
    		 Below 1 V
    SEN1 (P33-22) - E (P33-17)
    		 W (*1) - W-B
    G (*2) - W-B
    		Touch sensor detection signal
    		 Outside door handle touched
    		 Below 1 V
    SEN1 (P33-22) - E (P33-17)
    		 W (*1) - W-B
    G (*2) - W-B
    		Touch sensor detection signal
    		 Outside door handle not touched
    		 10 to 14 V
    SEL1 (P33-5) - E (P33-17)
    		 W (*1) - W-B
    B (*2) - W-B
    		Touch sensor activation control signal
    		 Move the key more than 5 m (16.4 ft) away from the front door LH
    		 10 to 14 V
    SEL1 (P33-5) - E (P33-17)
    		 W (*1) - W-B
    B (*2) - W-B
    		Touch sensor activation control signal
    		 Bring it to the outside handle
    		 Below 1 V
    CLG2 (P33-35) - CG2B (P33-36)
    		 G - BR
    		 Door electrical key oscillator (front RH) sensor signal
    		 All doors closed, all doors locked and engine switch off
    		 Alternating between 5 V and below 1 V
    CLG2 (P33-35) - CG2B (P33-36)
    		 G - BR
    		 Door electrical key oscillator (front RH) sensor signal
    		 Door unlocked or door open
    		 Below 1 V
    SEN2 (P33-23) - E (P33-17)
    		 W (*1) - W-B
    G (*2) - W-B
    		Touch sensor detection signal
    		 Outside door handle touched
    		 Below 1 V
    SEN2 (P33-23) - E (P33-17)
    		 W (*1) - W-B
    G (*2) - W-B
    		Touch sensor detection signal
    		 Outside door handle not touched
    		 10 to 14 V
    SEL2 (P33-6) - E (P33-17)
    		 W (*1) - W-B
    B (*2) - W-B
    		Touch sensor activation control signal
    		 Move the key more than 5 m (16.4 ft) away from the front door RH
    		 10 to 14 V
    SEL2 (P33-6) - E (P33-17)
    		 W (*1) - W-B
    B (*2) - W-B
    		Touch sensor activation control signal
    		 Bring it to the outside handle
    		 Below 1 V
    CLG5 (P33-11) - CG5B (P33-12)
    		 Y - V
    		 Indoor electrical key oscillator (front) sensor signal
    		 30 seconds after driver side door opened and closed, engine switch off
    		 Alternating between 5 V and below 1 V
    CLG5 (P33-11) - CG5B (P33-12)
    		 Y - V
    		 Indoor electrical key oscillator (front) sensor signal
    		 Within 30 seconds driver side door opened and closed, engine switch off
    		 Below 1 V
    CLG6 (P33-13) - CG6B (P33-14)
    		 LG - O
    		 Indoor electrical key oscillator (rear) sensor signal
    		 30 seconds after driver side door opened and closed, engine switch off
    		 Alternating between 5 V and below 1 V
    CLG6 (P33-13) - CG6B (P33-14)
    		 LG - O
    		 Indoor electrical key oscillator (rear) sensor signal
    		 Within 30 seconds driver side door opened and closed, engine switch off
    		 Below 1 V
    CLG7 (P33-15) - CG7B (P33-16)
    		 SB - P
    		 Luggage electrical key oscillator (inner) sensor signal
    		 Luggage compartment door opening switch OFF
    		 Alternating between 5 V and below 1 V
    CLG7 (P33-15) - CG7B (P33-16)
    		 SB - P
    		 Luggage electrical key oscillator (inner) sensor signal
    		 Luggage compartment door opening switch ON
    		 Below 1 V
    CLG8 (P33-31) - CG8B (P33-32)
    		 B - W
    		 Luggage electrical key oscillator (outer) sensor signal
    		 Luggage compartment door opening switch OFF
    		 Alternating between 5 V and below 1 V
    CLG8 (P33-31) - CG8B (P33-32)
    		 B - W
    		 Luggage electrical key oscillator (outer) sensor signal
    		 Luggage compartment door opening switch ON
    		 Below 1 V
    RCO (P33-29) - E (P33-17)
    		 LG - W-B
    		 Entry door control receiver power source
    		 Engine switch off, all doors closed and electrical key switch on.
    		 4.6 to 5.4 V
    RCO (P33-29) - E (P33-17)
    		 LG - W-B
    		 Entry door control receiver power source
    		 Engine switch off, all doors closed and electrical key switch off.
    		 Below 1 V
    RSSI (P33-39) - E (P33-17)
    		 Y - W-B
    		 Entry door control receiver electric wave existence signal
    		 Engine switch off, all doors closed, the electrical key is not in the action area.
    		 10 to 14 V
    RSSI (P33-39) - E (P33-17)
    		 Y - W-B
    		 Entry door control receiver electric wave existence signal
    		 Engine switch off, all doors closed, the electrical key is in the action area.
    		 Below 1 V
    RDA (P33-38) - E (P33-17)
    		 R - W-B
    		 Entry door control receiver data input signal
    		 Engine switch off, all doors closed and electrical key switch off.
    		 10 to 14 V
    RDA (P33-38) - E (P33-17)
    		 R - W-B
    		 Entry door control receiver data input signal
    		 Engine switch off, all doors closed and electrical key switch on.
    		 Pulse generation
    RDA (P33-38) - Body ground
    		 R - Body ground
    		 Tuner input signal
    		 Engine switch off, all doors closed, the electrical key is not in the action area.
    		 10 to 14 V
    RDA (P33-38) - Body ground
    		 R - Body ground
    		 Tuner input signal
    		 The electrical key is in the action area.
    		 Pulse generation
    ASEL (P33-37) - Body ground
    		 SB - Body ground
    		 Tuner select signal
    		 Engine switch off, luggage compartment door closed.
    		 4.6 to 5.4 V
    ASEL (P33-37) - Body ground
    		 SB - Body ground
    		 Tuner select signal
    		 Engine switch off, luggage compartment door open.
    		 Below 1 V
    VC5 (P33-30) - Body ground
    		 L - Body ground
    		 Transponder key amplifier power supply
    		 Electrical key is not in the vehicle.
    		 Below 1 V
    VC5 (P33-30) - Body ground
    		 L - Body ground
    		 Transponder key amplifier power supply
    		 Have the electrical key outside the cabin and open the driver's door.
    		 4.6 to 5.4 V
    TXCT (P33-8) - Body ground
    		 G - Body ground
    		 Transponder key amplifier output signal
    		 Electrical key is not in the cabin.
    		 Below 1 V
    TXCT (P33-8) - Body ground
    		 G - Body ground
    		 Transponder key amplifier output signal
    		 Have the electrical key outside the cabin and open the driver's door.
    		 Pulse generation
    (see waveform 1)
    CODE (P33-9) - Body ground
    		 GR - Body ground
    		 Transponder key amplifier communication signal
    		 Electrical key is not in the cabin.
    		 Below 1 V
    CODE (P33-9) - Body ground
    		 GR - Body ground
    		 Transponder key amplifier communication signal
    		 Have the electrical key outside the cabin and open the driver's door.
    		 Pulse generation
    (see waveform 2)
    *1: LHD Models
    *2: RHD Models
    If the result is not as specified, the ECU may have a malfunction.

  5. B112486E01
    Inspect using an oscilloscope.
    Waveform 1 (Reference): 
    Terminal
    		 TXCT - Body ground
    Tool Setting
    		 2 V/DIV, 10 ms/DIV
    Condition
    		 The electrical key is not in the cabin.

  6. B112487E01
    Inspect using an oscilloscope.
    Waveform 2 (Reference): 
    Terminal
    		 CODE - Body ground
    Tool Setting
    		 2 V/DIV, 20 ms/DIV
    Condition
    		 The electrical key is not in the cabin.


MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

  1. Measure the voltage according to the value(s) in the table below.
    B112574E01

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    LPSW (Q3-13) - Body ground
    		 BR - Body ground
    		 Luggage compartment opener switch signal
    		 Luggage compartment opener switch OFF
    		 10 to 14 V
    LPSW (Q3-13) - Body ground
    		 BR - Body ground
    		 Luggage compartment opener switch signal
    		 Luggage compartment opener switch ON
    		 Below 1 V
    If the result is not as specified, the junction block may have a malfunction.

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