Terminals Of Ecu

Fig 1: Identifying Instrument Panel Junction Block (Multiplex Network Body ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the multiplex network body ECU connector and instrument panel J/B connector.
2. Check the voltage and resistance of each terminal of the wire harness side connector.

   Standard 

   STANDARD REFERENCE CHART
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   BATB (IA-1) - Body ground	B - Body ground	+B (power battery system) power supply	Always	10 to 14 V
   BECU (ID-10) - Body ground	0 - Body ground	+B power supply	Always	10 to 14 V
   ALTB (ID-16) - Body ground	W - Body ground	+B (power generator system) power supply	Always	10 to 14 V
   GND1 (IF-10) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   ACC (IA-1) - Body ground	B - Body ground	Ignition power supply (ACC signal)	Ignition switch off → on (ACC)	Below 1 V 10 → to 14 V
   IG (IA-1) - Body ground	B - Body ground	Ignition power supply (IG signal)	Ignition switch off → on (IG)	Below 1 V → 10 to 14 V
   GND2 (IM-9) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   LCTY (IO-7) - Body ground	B - Body ground	Rear door (LH) courtesy light switch signal	Rear door (LH) is open → closed	Below 1 Ω → 10 kΩ or higher
   PCTY (D6-23) - Body ground	L - Body ground	Passenger side door courtesy light switch signal	Passenger side door is open → closed	Below 1 Ω → 10 kΩ or higher
   LGCY (D6-25) - Body ground	V - Body ground	Luggage compartment light (Luggage compartment door courtesy light switch) signal	Luggage compartment light is ON → OFF (Luggage compartment door is open (unlocked) → closed (locked)	Below 1 Ω → 10 kΩ or higher
   KSW* (D7-21) - Body ground	B - Body ground	Unlock warning switch signal	Ignition key is inserted → not inserted	Below 1 Ω → 10 kΩ or higher
   DCTY (D8-14) - Body ground	L - Body ground	Driver side door courtesy light switch signal	Driver side door is open → closed	Below 1 Ω → 10 kΩ or higher
   RCTY (D8-16) - Body ground	GR - Body ground	Rear door (RH) courtesy light switch signal	Rear door (RH) is open → closed	Below 1 Ω → 10 kΩ or higher

   HINT:

   *: without Smart Key System

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

3. Reconnect the multiplex network body ECU connector and instrument panel J/B connector.
4. Check the voltage of each terminal of the ECU side connector.

Voltage 

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

(*1): When operating the motor.

(*2): When operating the answer back function.