ELECTRIC PARKING BRAKE SYSTEM TERMINALS OF ECU


  1. CHECK ELECTRIC PARKING BRAKE ECU

    A001A8WE03

    1. Disconnect the S46 and S48 ECU connectors.

    2. Measure the voltage and resistance according to the values in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      S46-3 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      S46-8 (+B) - S46-3 (GND1) R - W-B +B power supply Engine switch off 11 to 14 V
      S48-1 (CA2L) - S48-9 (CA2H) W - B CAN communication line Engine switch off 108 to 132 Ω
      S48-2 (BECU) - S46-3 (GND1) BE - W-B Power supply Engine switch off 11 to 14 V
      S48-4 (IG) - S46-3 (GND1) G - W-B IG power supply Engine switch on (IG) 11 to 14 V

    3. Connect the S46 and S48 ECU connectors.

    4. Measure the voltage and resistance according to the values in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      S46-1 (M-) - S46-3 (GND1) GR - W-B Electric parking brake motor

      Engine switch on (IG)

      Electric parking brake not operating

      		 11 to 14 V
      S46-2 (M+) - S46-3 (GND1) L - W-B Electric parking brake motor

      Engine switch on (IG)

      Electric parking brake not operating

      		 11 to 14 V
      S46-6 (LPA) - S46-3 (GND1) G - W-B AUTO switch light output

      Engine switch on (IG)

      AUTO switch OFF

      		 11 to 14 V
      S46-7 (TX) - S46-3 (GND1) L - W-B Diagnosis communication signal 15 seconds after engine switch turned off 9 to 14 V
      S48-1 (CA2L) - S48-9 (CA2H) W - B CAN communication line Engine switch off 54 to 69 Ω
      S48-5 (AUTO) - S46-3 (GND1) R - W-B AUTO switch

      Engine switch on (IG)

      AUTO switch pushed

      		 Below 1 V

      Engine switch on (IG)

      AUTO switch OFF

      		 11 to 14 V
      S48-6 (TSN2) - S46-3 (GND1) G - W-B Tension sensor Engine switch on (IG) 0.5 to 4.5 V
      S48-7 (VT) - S46-3 (GND1) R - W-B Tension sensor power supply Engine switch on (IG) 4.75 to 5.25 V
      S48-8 (TSEN) - S46-3 (GND1) W - W-B Tension sensor Engine switch on (IG) 0.5 to 4.5 V
      S48-10 (SG) - S46-3 (GND1) Shielded - W-B - Always Below 1 Ω
      S48-12 (LCK1) - S46-3 (GND1) G - W-B Electric parking brake switch lock 1

      Engine switch on (IG)

      Electric parking brake switch OFF

      		 1.8 to 3.3 V

      Engine switch on (IG)

      Electric parking brake switch lock (push)

      		 1.8 to 3.3 V
      S48-13 (REL2) - S46-3 (GND1) B - W-B Electric parking brake switch release 2

      Engine switch on (IG)

      Electric parking brake switch OFF

      		 6.5 to 10.0 V

      Engine switch on (IG)

      Electric parking brake switch release (pull)

      		 2.8 to 5.0 V
      S48-14 (TGND) - S46-3 (GND1) B - W-B Tension sensor ground Always Below 1 Ω
      S48-15 (LCK2) - S46-3 (GND1) R - W-B Electric parking brake switch lock 2

      Engine switch on (IG)

      Electric parking brake switch OFF

      		 6.5 to 10.0 V

      Engine switch on (IG)

      Electric parking brake switch lock (push)

      		 2.8 to 5.0 V
      S48-16 (REL1) - S46-3 (GND1) W - W-B Electric parking brake switch release 1

      Engine switch on (IG)

      Electric parking brake switch OFF

      		 6.5 to 10.0 V

      Engine switch on (IG)

      Electric parking brake switch release (pull)

      		 2.8 to 5.0 V