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Terminals Of Ecu

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 
    1. Disconnect the 2A, 2B, 2C, 2E, 2F and 2G instrument panel junction block connectors and E50 and E51 main body ECU connectors.
      Fig 1: Identifying Instrument Panel Junction Block
      GTY291797Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Identifying E50 And E51 Main Body ECU Connectors
      GTY197841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      2A-7 (LGCY) - Body ground LG - Body ground Luggage compartment door courtesy light switch input Luggage compartment door CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω
      2E-20 (PCTY) - Body ground BE - Body ground Passenger side door courtesy light switch input Passenger side door CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω
      2B-30 (BECU) - Body ground W - Body ground +B power supply Always 11 to 14 V
      2A-21 (DCTY) - Body ground V - Body ground Driver side door courtesy light switch input Driver side door CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω
      2E-17 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      2E-19 (RCTY) - Body ground Y - Body ground Rear courtesy light switch RH input Rear door RH CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω
      2F-5 (ACC) - Body ground L - Body ground IG supply (ACC signal) Engine switch on (ACC) → off 11 to 14 V → Below 1 V
      2G-1 (IG) - Body ground W - Body ground IG supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V
      2G-1 (ALTB) - Body ground W - Body ground +B (power system alternator system) power supply Always 11 to 14 V
      E50-8 (LCTY) - Body ground B - Body ground Rear courtesy light switch LH input Rear door LH CLOSED (OFF) → OPEN (ON) 10 kΩ or higher → Below 1 Ω
      E51-4 (GND2) - 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 main body (instrument panel junction block) connectors.
    4. Measure the voltage between each terminal of the wire harness side connectors and body ground.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      2S-17 (HAZ) - Body ground BE - Body ground Turn signal flasher relay signal Transmitter LOCK or UNLOCK switch is pressed → not pressed Below 1 V*1 → 11 to 14 V
      E50-1 (TR+)- Body ground P - Body ground Luggage compartment door opener motor Luggage compartment door CLOSED (LOCKED) → OPEN (UNLOCKED) Below 1 V → 11 to 14 V*2
      • *1: When operating the answer back function.
      • *2: When operating the motor.
  2. CHECK CERTIFICATION ECU ASSEMBLY 
    1. Disconnect the E36 ECU connector.
      Fig 3: E36 ECU Connector Terminal Identification
      GTY196237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance of the wire harness side connector.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E36-1 (+B) - E36-17 (E) GR - W-B Battery power supply Always 11 to 14 V
      E36-17 (E) - 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 E36 ECU connector.
    4. Measure the voltage of the connector.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E36-29 (RC0) - E36-17 (E) LG - W-B Door control receiver power supply Engine switch off, all doors closed and transmitter switch not pressed Below 1 V
      E36-29 (RC0) - E36-17 (E) LG - W-B Door control receiver power supply Engine switch off, all doors closed and transmitter switch pressed 4.6 to 5.4 V
      E36-38 (RDA) - E36-17 (E) P - W-B Door control receiver input signal Engine switch off, all doors closed and transmitter switch not pressed 11 to 14 V pulse generation at regular intervals
      E36-38 (RDA) - E36-17 (E) P - W-B Door control receiver input signal Engine switch off, all doors closed and transmitter switch pressed Pulse generation
      E36-18 (IG) - E36-17 (E) B - W-B IG power supply Engine switch on (IG) 11 to 14 V
      E36-18 (IG) - E36-17 (E) B - W-B IG power supply Engine switch off Below 1 V

      If the result is not as specified, the ECU may have a malfunction.

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