SMART ENTRY AND START SYSTEM (for Entry Function) TERMINALS OF ECU


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the G20 certification ECU (smart key ECU assembly) connector.

      A01CCEFE01

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

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      G20-1 (+B) - Body ground R - Body ground +B power supply Always 11 to 14 V
      G20-17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the G20 certification ECU (smart key ECU assembly) connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      G20-3 (TSW1) - G20-17 (E) V - W-B Entry lock switch (for driver side) signal Entry lock switch (for driver side) not pushed

      11 to 14 V

      (Intermittent operation)
      G20-3 (TSW1) - G20-17 (E) V - W-B Entry lock switch (for driver side) signal Entry lock switch (for driver side) pushed Below 2 V
      G20-4 (TSW2) - G20-17 (E) W - W-B Entry lock switch (for front passenger side) signal Entry lock switch (for front passenger side) not pushed

      11 to 14 V

      (Intermittent operation)
      G20-4 (TSW2) - G20-17 (E) W - W-B Entry lock switch (for front passenger side) signal Entry lock switch (for front passenger side) pushed Below 2 V
      G20-5 (SEL1) - G20-17 (E) Y - W-B Touch sensor activation control signal Move the key more than 5 m (16.4 ft.) away from the front door (for driver side) 11 to 14 V
      G20-5 (SEL1) - G20-17 (E) Y - W-B Touch sensor activation control signal Move the key within 5 m (16.4 ft.) from the front door (for driver side) Below 1 V
      G20-6 (SEL2) - G20-17 (E) SB - W-B Touch sensor activation control signal Move the key more than 5 m (16.4 ft.) away from the front door (for front passenger side) 11 to 14 V
      G20-6 (SEL2) - G20-17 (E) SB - W-B Touch sensor activation control signal Move the key within 5 m (16.4 ft.) from the front door (for front passenger side) Below 1 V
      G20-7 (TSW5) - G20-17 (E) GR - W-B Back door opener switch assembly (lock switch) signal Back door opener switch assembly (lock switch) not pushed

      11 to 14 V

      (Intermittent operation)
      G20-7 (TSW5) - G20-17 (E) GR - W-B Back door opener switch assembly (lock switch) signal Back door opener switch assembly (lock switch) pushed Below 2 V
      G20-11 (CLG5) - G20-12 (CG5B) P - V Indoor electrical key oscillator (for front floor) sensor signal 30 seconds after driver side door opened and closed, engine switch off Below 1 V
      G20-11 (CLG5) - G20-12 (CG5B) P - V Indoor electrical key oscillator (for front floor) sensor signal Within 30 seconds after driver side door opened and closed, engine switch off Alternating between 5 V and below 1 V
      G20-13 (CLG6) - G20-14 (CG6B) B - Y Indoor electrical key oscillator (for center floor) sensor signal 30 seconds after driver side door opened and closed, engine switch off Below 1 V
      G20-13 (CLG6) - G20-14 (CG6B) B - Y Indoor electrical key oscillator (for center floor) sensor signal Within 30 seconds after driver side door opened and closed, engine switch off Alternating between 5 V and below 1 V
      G20-15 (CLG7) - G20-16 (CG7B) B - G Indoor electrical key oscillator (for rear floor) sensor signal 30 seconds after driver side door opened and closed, engine switch off Below 1 V
      G20-15 (CLG7) - G20-16 (CG7B) B - G Indoor electrical key oscillator (for rear floor) sensor signal Within 30 seconds after driver side door opened and closed, engine switch off Alternating between 5 V and below 1 V
      G20-18 (IG) - Body ground R - Body ground Ignition power supply Engine switch off Below 1 V
      G20-18 (IG) - Body ground R - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V
      G20-19 (ACC) - Body ground GR - Body ground ACC power supply Engine switch off Below 1 V
      G20-19 (ACC) - Body ground GR - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V
      G20-22 (SEN1) - G20-17 (E) P - W-B Touch sensor detection signal Door outside handle assembly (for driver side) touched Below 2 V
      G20-22 (SEN1) - G20-17 (E) P - W-B Touch sensor detection signal Door outside handle assembly (for driver side) not touched 11 to 14 V
      G20-23 (SEN2) - G20-17 (E) G - W-B Touch sensor detection signal Door outside handle assembly (for front passenger side) touched Below 2 V
      G20-23 (SEN2) - G20-17 (E) G - W-B Touch sensor detection signal Door outside handle assembly (for front passenger side) not touched 11 to 14 V
      G20-29 (RCO) - G20-17 (E) P - W-B Entry door control receiver power source Engine switch off, all doors closed and electrical key switch on 4.5 to 5.5 V
      G20-29 (RCO) - G20-17 (E) P - W-B Entry door control receiver power source Engine switch off, all doors closed and electrical key switch off Below 1 V
      G20-31 (CLG8) - G20-32 (CG8B) W - R Outside electrical key oscillator (for rear side) sensor signal Back door opener switch assembly off Below 1 V
      G20-31 (CLG8) - G20-32 (CG8B) W - R Outside electrical key oscillator (for rear side) sensor signal Back door opener switch assembly on Alternating between 5 V and below 1 V
      G20-33 (CLG1) - G20-34 (CG1B) L - LG Door electrical key oscillator (for driver side) sensor signal All doors closed, all doors locked and engine switch off Alternating between 5 V and below 1 V
      G20-33 (CLG1) - G20-34 (CG1B) L - LG Door electrical key oscillator (for driver side) sensor signal Door unlocked or door open (for driver side) Below 1 V
      G20-35 (CLG2) - G20-36 (CG2B) P - V Door electrical key oscillator (for front passenger side) sensor signal All doors closed, all doors locked and engine switch off Alternating between 5 V and below 1 V
      G20-35 (CLG2) - G20-36 (CG2B) P - V Door electrical key oscillator (for front passenger side) sensor signal Door unlocked or door open (for front passenger side) Below 1 V
      G20-38 (RDA) - G20-17 (E) V - W-B Entry door control receiver data input signal Engine switch off, all doors closed and electrical key switch off 11 to 14 V
      G20-38 (RDA) - G20-17 (E) V - W-B Entry door control receiver data input signal Engine switch off, all doors closed and electrical key switch on Pulse generation
      G20-38 (RDA) - Body ground V - Body ground Tuner input signal Engine switch off, all doors closed, electrical key not in detection area 11 to 14 V
      G20-38 (RDA) - Body ground V - Body ground Tuner input signal Electrical key in detection area Pulse generation
      G20-39 (RSSI) - G20-17 (E) SB - W-B Entry door control receiver electric wave existence signal Engine switch off, all doors closed, electrical key not in detection area 11 to 14 V
      G20-39 (RSSI) - G20-17 (E) SB - W-B Entry door control receiver electric wave existence signal Engine switch off, all doors closed, electrical key in detection area Below 1 V

      If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

  2. CHECK MAIN BODY ECU


    1. Disconnect the 4K, 4A and G50 main body ECU connectors.

      A01CDWIE02

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

      Tech Tips

      Measure the values on the wire harness side with the connectors disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      4K-1 (BECU) - Body ground R - Body ground Battery power supply Always 11 to 14 V
      4K-9 (BATB) - Body ground W - Body ground Battery power supply Always 11 to 14 V
      4A-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G50-1 (GND) - 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.

    3. Reconnect the 4K, 4A and G50 main body ECU connectors.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      4A-4 (LCTY) - Body ground R - Body ground Rear door LH courtesy light switch input Rear door LH open Below 1 V
      4A-4 (LCTY) - Body ground R - Body ground Rear door LH courtesy light switch input Rear door LH closed Pulse generation
      G48-26 (BDSU) - Body ground LG - Body ground Back door opener switch assembly (opener switch) signal Back door opener switch assembly (opener switch) not pushed Pulse generation
      G48-26 (BDSU) - Body ground LG - Body ground Back door opener switch assembly (opener switch) signal Back door opener switch assembly (opener switch) pushed Below 1 V
      G49-7 (RCTY) - Body ground LG - Body ground Rear door RH courtesy light switch input Rear door RH open Below 1 V
      G49-7 (RCTY) - Body ground LG - Body ground Rear door RH courtesy light switch input Rear door RH closed Pulse generation
      G49-21 (PCTY) - Body ground L - Body ground Front passenger side door courtesy switch input Front passenger side door open Below 1 V
      G49-21 (PCTY) - Body ground L - Body ground Front passenger side door courtesy switch input Front passenger side door closed 11 to 14 V or Pulse generation
      G48-24 (DCTY) - Body ground W - Body ground Driver side door courtesy switch input Driver side door open Below 1 V
      G48-24 (DCTY) - Body ground W - Body ground Driver side door courtesy switch input Driver side door closed 11 to 14 V or Pulse generation
      G49-25 (BCTY) - Body ground*1 W - Body ground Back door courtesy light switch input Back door open Below 1 V
      G49-25 (BCTY) - Body ground*1 W - Body ground Back door courtesy light switch input Back door closed Pulse generation
      G49-25 (BCTY) - Body ground*2 W - Body ground Back door courtesy light switch input Back door open Below 1 V
      G49-25 (BCTY) - Body ground*2 W - Body ground Back door courtesy light switch input Back door closed and luggage compartment light switch on 11 to 14 V
      G49-25 (BCTY) - Body ground*2 W - Body ground Back door courtesy light switch input Back door closed and luggage compartment light switch off Pulse generation

      • *1: w/ Power Back Door System

      • *2: w/o Power Back Door System

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