Terminals Of Ecu

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THEFT WARNING ECU

Fig 1: Identifying Terminals Of ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the T5 ECU connector.
2. Measure the resistance and voltage of each terminal of the wire harness side connector.
  Standard:
  
  Fig 2: Voltage Specifications (1 Of 3)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the T5 ECU connector.
4. Measure the voltage and frequency of each terminal of the connector.
  Standard:
  
  Fig 3: Voltage Specifications (2 Of 3)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Voltage Specifications (3 Of 3)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the result is not as specified, the theft warning ECU may have a malfunction.
CHECK STEERING LOCK ECU

Fig 5: Identifying Steering Lock ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the S46 ECU connector.
2. Measure the resistance and voltage of each terminal of the wire harness side connector.
  Standard:
  
  Fig 6: Resistance Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the S46 ECU connector.
4. Check the resistance and voltage of each terminal of the connector.
  Standard:
  
  Fig 7: Voltage Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If the result is not as specified, the steering lock ECU may have a malfunction.
1. Inspect using an oscilloscope.
  
  Fig 8: Waveform 1 Reference Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 9: Oscilloscope Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect using an oscilloscope.
  
  Fig 10: Waveform 2 Reference Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 11: Oscilloscope Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect using an oscilloscope.
  
  Fig 12: Waveform 3 Reference Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 13: Oscilloscope Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Inspect using an oscilloscope.
  
  Fig 14: Waveform 4 Reference Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 15: Oscilloscope Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Inspect using an oscilloscope.
  
  Fig 16: Waveform 5 Reference Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 17: Oscilloscope Waveform Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK DRIVER DOOR ECU

Fig 18: Identifying Driver Door ECU Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the D25 ECU connector.
2. Measure the resistance and voltage of each terminal of the wire harness side connector.
  Standard:
  
  Fig 19: Voltage Specifications (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the D25 ECU connector.
4. Measure the frequency and voltage of each terminal of the connector.
  Standard:
  
  Fig 20: Voltage Specifications (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the driver door ECU may have a malfunction.
CHECK PASSENGER DOOR ECU

Fig 21: Identifying Passenger Door ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the F17 ECU connector.
2. Measure the resistance and voltage of each terminal of the wire harness side connector.
  Standard:
  
  Fig 22: Voltage Specifications (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  The result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the F17 ECU connector.
4. Measure the frequency and voltage of each terminal of the connector.
  Standard:
  
  Fig 23: Voltage Specifications (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the passenger door ECU may have a malfunction.
CHECK REAR DOOR LH ECU

Fig 24: Identifying Rear Door LH ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the R12 and R13 ECU connectors.
2. Measure the resistance and voltage of each terminal of the wire harness side connectors.
  Standard:
  
  Fig 25: Voltage Specifications (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the R23 and RB ECU connectors.
4. Measure the frequency and voltage of each terminal of the connectors.
  Standard:
  
  Fig 26: Voltage Specifications (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the rear door LH ECU may have a malfunction.
CHECK REAR DOOR RH ECU

Fig 27: Identifying Rear Door RH ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the R14 and R15 ECU connectors.
2. Measure the resistance and voltage of each terminal of the wire harness side connectors.
  Standard:
  
  Fig 28: Voltage Specifications (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  The result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the R14 and R15 ECU connectors.
4. Measure the frequency and voltage of each terminal of the connectors
  Standard:
  
  Fig 29: Voltage Specifications (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the rear door RH ECU may have a malfunction.
5. CHECK LUGGAGE ROOM J/B ASSY (LUGGAGE ROOM J/B ECU)
  
  Fig 30: Identifying Luggage Room J/B Assy (Luggage Room J/B ECU) Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Disconnect the LA, LL, L12 and L14 ECU connectors.
  2. Measure the resistance and voltage of each terminal of the wire harness side connectors.
    Standard:
    
    Fig 31: Voltage Specifications (1 Of 2)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, there may be a malfunction on the wire harness side.
6. Reconnect the LA, LL, L12 and L14 connectors.
7. Measure the resistance of each terminal of the connector
  Standard:
  
  Fig 32: Voltage Specifications (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the luggage room J/B ECU may have a malfunction.