THEFT DETERRENT SYSTEM > TERMINALS OF ECU

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CHECK MAIN BODY ECU, INSTRUMENT PANEL JUNCTION BLOCK


  1. Remove the main body ECU.


    B210280E01


    Text in Illustration 
    *1
    		Instrument Panel Junction Block

    B210281E01


    Text in Illustration 
    *1
    		Main Body ECU

  2. Disconnect the D42 main body ECU connector.

  3. Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.

    Terminal No. (Symbol).
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    3F-2 (FLCY) - Body ground
    		-
    		Front door courtesy light switch LH input
    		Front door LH CLOSED (off) → OPEN (on)
    		10 kΩ or higher → Below 1 Ω
    3F-4 (FRCY) - Body ground
    		-
    		Front door courtesy light switch RH input
    		Front door RH CLOSED (off) → OPEN (on)
    		10 kΩ or higher → Below 1 Ω
    3F-11 (GND1) - Body ground
    		-
    		Ground
    		Always
    		Below 1 Ω
    3F-20 (HCTY) - Body ground
    		-
    		Engine hood courtesy switch input
    		Engine hood CLOSED (off) → OPEN (on)
    		10 kΩ or higher → Below 1 Ω
    3F-29 (ACC) - Body ground
    		-
    		Ignition power supply (ACC signal)
    		Ignition switch ACC → off
    		11 to 14 V → Below 1 V
    3F-30 (BECU) - Body ground
    		-
    		+B (power system signal system) power supply
    		Always
    		11 to 14 V
    3F-31 (ALTB) - Body ground
    		-
    		+B (power system alternator system) power supply
    		Always
    		11 to 14 V
    3F-32 (IG) - Body ground
    		-
    		Ignition power supply (IG signal)
    		Ignition switch ON → off
    		11 to 14 V → Below 1 V
    D42-17 (KSW) - Body ground*1
    		LG - Body ground
    		Unlock warning switch input
    		NO key in ignition key cylinder (off) → Key inserted (on)
    		10 kΩ or higher → Below 1 Ω
    D42-19 (BCTY) - Body ground
    		V - Body ground
    		Back door courtesy light switch input
    		Back door CLOSED (off) → OPEN (on)
    		10 kΩ or higher → Below 1 Ω

    1. *1: w/o Entry and Start System

    HINT:
    If the result is not as specified, there may be a malfunction on the wire harness side.

  4. Reinstall the main body ECU.

  5. Reconnect the main body ECU connector.

  6. Measure the voltage between each terminal of the wire harness side connectors and body ground.

    Terminal No. (Symbol).
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    D42-3 (HAZ) - Body ground
    		R - Body ground
    		Turn signal flasher relay signal
    		System is in alarm sounding state
    		Below 1 V
    3B-22 (HORN) - Body ground
    		G-B - Body ground
    		Vehicle horn drive
    		Vehicle horn is sounding
    (Theft deterrent system is in alarm sounding state)
    		Pulse generation
    (Below 1 V ← → 12 V)
    3B-40 (SH) - Body ground
    		GR - Body ground
    		Security horn drive
    		Vehicle horn is sounding
    (Theft deterrent system is in alarm sounding state)
    		Pulse generation
    (Below 1 V ← → 12 V)
    If the result is not as specified, the main body ECU may have a malfunction.