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Terminals Of Ecu

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  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU) 
    Fig 1: Instrument Panel Junction Block (Main Body ECU, Front View)
    GTY246007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Instrument Panel Junction Block (Main Body ECU, Rear View)
    GTY246340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the connectors.
      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      HRLY (E15-20) - GND1 (IE-17) BR - W-B Headlight Relay
      (HEAD signal)      		 Light control switch is OFF or TAIL 11 to 14 V
      HRLY (E15-20) - GND1 (IE-17) BR - W-B Headlight Relay
      (HEAD signal)      		 Light control switch is HEAD Below 1 V
      DIM (E16-3) - GND1 (IE-17) LG - W-B Daytime running light Relay
      (High beam signal)      		 Light control switch is HEAD Below 1 V
      DIM (E16-3) - GND1 (IE-17) LG - W-B Daytime running light Relay
      (High beam signal)      		 Light control switch is in except HEAD 11 to 14 V
      TAIL (E15-21) - GND1 (IE-17) W - W-B Taillight relay
      (TAIL signal)      		 Light control switch is OFF Below 1 V
      TAIL (E15-21) - GND1 (IE-17) W - W-B Taillight relay
      (TAIL signal)      		 Light control switch is TAIL 11 to 14 V
      ILE (IK-2) - GND1 (IE-17) W - W-B Illumination signal
      • Room light switch position is DOOR
      • Door closed
      		 11 to 14 V
      ILE (IK-2) - GND1 (IE-17) W - W-B Illumination signal
      • Room light switch position is DOOR
      • Door open
      		 Below 1 V
      FSPT (E15-2) - GND1 (IE-17) V - W-B Foot light illumination
      (Illumination signal)      		 Foot light illumination OFF 11 to 14 V
      FSPT (E15-2) - GND1 (IE-17) V - W-B Foot light illumination
      (Illumination signal)      		 Foot light illumination ON Below 1 V
      HU (IJ-4) - GND1 (IE-17) Y - W-B Headlight dimmer switch
      (HIGH signal)      		 Light control switch is HEAD
      Headlight dimmer switch is LOW      		 11 to 14 V
      HU (IJ-4) - GND1 (IE-17) Y - W-B Headlight dimmer switch
      (HIGH signal)      		 Light control switch is HEAD
      Headlight dimmer switch is HIGH      		 Below 1 V
      LCTY (E15-8) - GND1 (IE-17) SB - W-B Courtesy switch
      (Rear left door circuit)      		 Rear left door is closed Below 1 V
      LCTY (E15-8) - GND1 (IE-17) SB - W-B Courtesy switch
      (Rear left door circuit)      		 Rear left door is open 11 to 14 V
      FFGO (E17-17) - GND1 (IE-17) G - W-B Front fog relay
      (Front fog circuit)      		 Front fog light is OFF 11 to 14 V
      FFGO (E17-17) - GND1 (IE-17) G - W-B Front fog relay
      (Front fog circuit)      		 Front fog light is ON Below 1 V
      DCTY (IA-21) - GND1 (IE-17) W - W-B Courtesy switch
      (Front left door circuit)      		 Front left door is open Below 1 V
      DCTY (IA-21) - GND1 (IE-17) W - W-B Courtesy switch
      (Front left door circuit)      		 Front left door is closed 11 to 14 V
      RRCY (ID-7) - GND1 (IE-17) LG - W-B Courtesy switch
      (Rear right door circuit)      		 Rear right door is open Below 1 V
      RRCY (ID-7) - GND1 (IE-17) LG - W-B Courtesy switch
      (Rear right door circuit)      		 Rear right door is closed 11 to 14 V
      HF (E15-22) - GND1 (IE-17) R - W-B Headlight dimmer switch
      (FLASH signal)      		 Headlight dimmer switch is OFF 11 to 14 V
      HF (E15-22) - GND1 (IE-17) R - W-B Headlight dimmer switch
      (FLASH signal)      		 Headlight dimmer switch is FLASH Below 1 V
      FFOG (E17-13) - GND1 (IE-17) GR - W-B Front fog light switch
      (Front fog light signal)      		 Light control switch is TAIL
      Fog light switch is OFF      		 11 to 14 V
      FFOG (E17-13) - GND1 (IE-17) GR - W-B Front fog light switch
      (Front fog light signal)      		 Light control switch is TAIL
      Fog light switch is ON      		 Below 1 V
      PCTY (IC-14) - GND1 (IE-17) BR - W-B Courtesy switch
      (Front right door circuit)      		 Front right door is open Below 1 V
      PCTY (IC-14) - GND1 (IE-17) BR - W-B Courtesy switch
      (Front right door circuit)      		 Front right door is closed 11 to 14 V
      BCTY (IA-7) - GND1 (IE-17) LG - W-B Courtesy switch
      (Back door)      		 Back door is open Below 1 V
      BCTY (IA-7) - GND1 (IE-17) LG - W-B Courtesy switch
      (Back door)      		 Back door is closed 11 to 14 V
      LSWP (E15-10) - GND1 (IE-17) Y - W-B Door lock position switch
      (Front right door)      		 Front right door is in unlock position 11 to 14 V
      LSWP (E15-10) - GND1 (IE-17) Y - W-B Door lock position switch
      (Front right door)      		 Front right door is in lock position Below 1 V
      LSWD (E15-25) - GND1 (IE-17) Y - W-B Door lock position switch
      (Front left door)      		 Front left door is in unlock position 11 to 14 V
      LSWD (E15-25) - GND1 (IE-17) Y - W-B Door lock position switch
      (Front left door)      		 Front left door is in lock position Below 1 V

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

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