Terminals Of Ecu

Fig 1: Checking Instrument Panel J/B Assembly (Integration Relay)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the 1A, 1B, 1C, 1E, 1F, 1G and 1M J/B connectors.
2. Measure the resistance and voltage of the wire harness side connectors.

   Standard: 

   TERMINAL DESCRIPTION CHART
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   SIG (1F-1) - Body ground	W - Body ground	Ignition power supply	Ignition switch OFF -> ON	Below 1 V Ω 10 to 14 V
   ALTB (1G-1) - Body ground	W - Body ground	+B (ALTB) power supply	Always	10 to 14 V
   ECUB (1B-30)- Body ground	V - Body ground	+B (ECUB) power supply	Always	10 to 14 V
   KSW (1E-26) - Body ground	B - Body ground	Key unlock warning switch input	No key in ignition key cylinder -> key inserted	10 kΩ or higher -> Below 1 Ω
   DCTY (1A-21) - Body ground	O - Body ground	Driver side courtesy switch input	Driver side door closed -> open	10 kΩ or higher -> Below 1 Ω
   PCTY (1C-14) - Body ground	L -Body ground	Passenger side courtesy switch input	Passenger side door closed -> open	10 kΩ or higher -> Below 1 Ω
   BCTY (1A-7) - Body ground	V - Body ground	Back door courtesy switch input	Back door closed -> open	10 kΩ or higher -> Below 1 Ω
   GND (1M-7) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   GND (1E-17) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

3. If the result is not as specified, there may be a malfunction on the wire harness side.
4. Reconnect the 1A, 1B, 1C, 1E, 1F, 1G and 1M J/B connectors.
5. Measure the voltage of the connectors.

   Standard: 

   TERMINAL DESCRIPTION CHART
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   HAZ (1S-17) - Body ground	O - Body ground	Hazard warning lamp drive	Answer-back OFF -> ON	10 to 14 V Ω Pulse generation
   RDA (I6-7) - Body ground	GR - Body ground	Door control receiver input	No key in ignition key cylinder, all door closed and each transmitter switch OFF -> ON	Below 1 V Ω Approx. 10 to 14 V Ω Below 1 V

If the result is not as specified, the J/B assy (integration relay) may have a malfunction.