THEFT DETERRENT SYSTEM (w/ Smart Entry and Start System) TERMINALS OF ECU


  1. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the main body ECU (driver side junction block assembly) connectors.

      A01EL3SE05

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      D49-7 (RCTY) - Body ground GR - Body ground Rear courtesy light switch RH input Rear door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      D49-21 (PCTY) - Body ground V - Body ground Passenger side courtesy light switch input Passenger side door closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      D49-25 (BCTY) - Body ground GR - Body ground Back door courtesy light switch input Back door closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      D50-16 (HCTY) - Body ground BE - Body ground Security courtesy switch Engine hood closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      D50-24 (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
      2A-1 (ACC) - Body ground B - Body ground Ignition power supply (ACC signal) Engine switch on (ACC) → OFF 11 to 14 V → Below 1 V
      2A-1 (IG) - Body ground B - Body ground Ignition power supply (IG signal) Engine switch on (IG) → OFF 11 to 14 V → Below 1 V
      2C-30 (ALTB) - Body ground BR - Body ground +B (power system alternator system) power supply Always 11 to 14 V
      2F-16 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      2C-24 (BECU) - Body ground L - Body ground +B power supply Always 11 to 14 V
      2C-24 (BECU) - Body ground L - Body ground +B power supply Always 11 to 14 V
      2O-19 (LCTY) - Body ground R - Body ground Rear courtesy light switch LH input Rear door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω

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

      Tech Tips

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

    3. Reconnect the main body ECU (driver side junction block assembly) connectors.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      D48-4 (HAZ) - Body ground G - Body ground Turn signal flasher relay signal System in alarm sounding state Below 1 V
      D51-4 (IND) - Body ground SB - Body ground Security indicator output

      Security indicator on

      (It lights up only in arming preparation state or alarm sounding state. It flashes when immobiliser is operating.)

      		 3 to 6 V
      D51-6 (SH) - Body ground BR - Body ground Security horn drive Security horn sounding

      Pulse generation

      (Below 1 V ← → 12 V)
      2C-25 (HORN) - Body ground R - Body ground Vehicle horn drive

      Vehicle horn sounding

      (Theft deterrent system in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 12 V)

      If the result is not as specified, the main body ECU (driver side junction block assembly) may have a malfunction.