THEFT DETERRENT SYSTEM > TERMINALS OF ECU

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CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


  1. Disconnect the main body ECU (multiplex network body ECU) connectors.


    E187247E12

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

    HINT:
    Measure the value(s) on the wire harness side with the connectors disconnected.


    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    MB-31 (ALTB) - Body ground
    		-
    		Auxiliary battery power supply
    		Power switch off
    		11 to 14 V
    MB-30 (BECU) - Body ground
    		-
    		Auxiliary battery power supply
    		Power switch off
    		11 to 14 V
    MB-29 (ACC) - Body ground
    		-
    		Ignition power supply (ACC signal)
    		Power switch on (ACC) → off
    		11 to 14 V → Below 1 V
    MB-32 (IG) - Body ground
    		-
    		Ignition power supply (IG signal)
    		Power switch on (IG) → off
    		11 to 14 V → Below 1 V
    MB-11 (GND1) - Body ground
    		-
    		Ground
    		Always
    		Below 1 Ω
    H17-3 (GND2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    MB-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
    MB-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
    H18-3 (LCTY) - Body ground
    		G - Body ground
    		Rear door courtesy light switch LH input
    		Rear door LH closed (OFF) → open (ON)
    		10 kΩ or higher → Below 1 Ω
    H16-6 (RCTY) - Body ground
    		G - Body ground
    		Rear door courtesy light switch RH input
    		Rear door RH closed (OFF) → open (ON)
    		10 kΩ or higher → Below 1 Ω
    H16-19 (BCTY) - Body ground
    		SB - Body ground
    		Back door courtesy switch input
    		Back door closed (OFF) → open (ON)
    		10 kΩ or higher → Below 1 Ω
    MB-20 (HCTY) - Body ground
    		-
    		Security courtesy switch input
    		Engine hood open (ON) → closed (OFF)
    		Below 1 Ω → 10 kΩ or higher
    If the result is not as specified, there may be a malfunction in the wire harness.

  3. Reconnect the main body ECU (multiplex network body ECU) connectors.

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

    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    H16-7 (LSFL) - Body ground
    		GR - Body ground
    		Front door LH unlock detection switch input
    		Front door LH unlocked
    		Below 1 V
    H16-7 (LSFL) - Body ground
    		GR - Body ground
    		Front door LH unlock detection switch input
    		Front door LH locked
    		Pulse generation
    H16-18 (LSFR) - Body ground
    		SB - Body ground
    		Front door RH unlock detection switch input
    		Front door RH unlocked
    		Below 1 V
    H16-18 (LSFR) - Body ground
    		SB - Body ground
    		Front door RH unlock detection switch input
    		Front door RH locked
    		Pulse generation
    2D-25 (LSWL) - Body ground
    		GR - Body ground
    		Rear door LH unlock detection switch input
    		Rear door LH unlocked
    		Below 1 V
    2D-25 (LSWL) - Body ground
    		GR - Body ground
    		Rear door LH unlock detection switch input
    		Rear door LH locked
    		Pulse generation
    H17-2 (LSWR) - Body ground
    		GR - Body ground
    		Rear door RH unlock detection switch input
    		Rear door RH unlocked
    		Below 1 V
    H17-2 (LSWR) - Body ground
    		GR - Body ground
    		Rear door RH unlock detection switch input
    		Rear door RH locked
    		Pulse generation
    H16-12 (SLF+) - Body ground
    		L - Body ground
    		Security courtesy switch wire
    		Always
    		Below 1 V
    H17-23 (SSW1) - Body ground
    		G - Body ground
    		Intrusion sensor cancel switch signal
    		Intrusion sensor cancel switch on
    		Below 1 V
    H17-23 (SSW1) - Body ground
    		G - Body ground
    		Intrusion sensor cancel switch signal
    		Intrusion sensor cancel switch off
    		Pulse generation
    H17-12 (ISIF) - Body ground
    		V - Body ground
    		Intrusion sensor (theft warning ultrasonic sensor) signal input
    		No moving object detected by sensor
    		11 to 14 V
    H17-12 (ISIF) - Body ground
    		V - Body ground
    		Intrusion sensor (theft warning ultrasonic sensor) signal input
    		Moving object detected by sensor during arming preparation state or armed state
    		Pulse generation
    2B-15 (GPBS) - Body ground*
    		V - Body ground
    		Glass breakage sensor drive
    		Always
    (Back door glass not broken)
    		Below 1 V
    H17-6 (GCS) - Body ground*
    		G - Body ground
    		Communication line between main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor
    1. Theft deterrent system changes from armed preparation state to armed state.
    2. The tilt sensor detects pitch angle of vehicle inclination when theft deterrent system is in armed state.
    		Pulse generation
    H16-3 (HAZ) - Body ground
    		Y - Body ground
    		Turn signal flasher relay signal
    		System in alarm sounding state
    		Below 1 V
    2A-51 (IND) - Body ground
    		BR - Body ground
    		Security indicator light up
    		Security indicator light on (It lights up only for 27.5 sec. in alarm sounding state.)
    		3 to 10 V
    H17-18 (SSCL) - Body ground
    		L - Body ground
    		Theft warning sire drive
    		Theft warning sire sounding
    (Theft deterrent system in alarm sounding state)
    		Pulse generation
    (Below 1 V ← → 12 V)
    2C-24 (HORN) - Body ground
    		SB - Body ground
    		Vehicle horn drive
    		Vehicle horns sounding
    (Theft deterrent system in alarm sounding state)
    		Pulse generation
    (Below 1 V ← → 12 V)

    1. *: w/ Combination Meter Assembly with mph Units
    If the result is not as specified, the main body ECU (multiplex network body ECU) may have a malfunction.