ELECTRIC PARKING BRAKE SYSTEM TERMINALS OF ECU


  1. CHECK PARKING BRAKE ECU ASSEMBLY

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    Text in Illustration
    *a

    Front view of wire harness connector

    (to Parking Brake ECU Assembly)

    		 - -

    1. Disconnect the parking brake ECU assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U36-3 (GND1) - Body ground W-B Ground Always Below 1 Ω
      U36-8 (+B) - Body ground B Electric parking brake motor power supply Engine switch off 11 to 14 V
      U37-1 (CA2L) - U37-9 (CA2H) W - B CAN communication line Engine switch off 54 to 69 Ω
      U37-2 (BECU) - Body ground V Parking brake ECU power supply Engine switch off 11 to 14 V
      U37-4 (IG) - Body ground B IG power supply Engine switch on (IG) 11 to 14 V

    3. Connect the parking brake ECU assembly connectors.

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      Text in Illustration
      *a

      Component with harness connected

      (Parking Brake ECU Assembly)

      		 - -

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U36-1 (M-) - Body ground L Electric parking brake motor

      Engine switch on (IG)

      Electric parking brake not operating

      		 4.5 to 6.8 V
      U36-2 (M+) - Body ground G Electric parking brake motor

      Engine switch on (IG)

      Electric parking brake not operating

      		 4.5 to 6.8 V
      U36-6 (LPA) - Body ground L AUTO indicator light output

      Engine switch on (IG)

      AUTO indicator light off

      		 11 to 14 V
      U36-7 (TX) - Body ground GR Combination meter communication signal 20 seconds after engine switch turned off 9 to 14 V
      U37-5 (AUTO) - Body ground P AUTO switch (Parking light switch assembly)

      Engine switch on (IG)

      AUTO switch (Parking light switch assembly) pushed

      		 Below 1 V

      Engine switch on (IG)

      AUTO switch (Parking light switch assembly) off

      		 11 to 14 V
      U37-6 (TSN2) - Body ground W Tension sensor 2 Engine switch on (IG) 0.5 to 4.5 V
      U37-7 (VT) - Body ground R Tension sensor power supply Engine switch on (IG) 4.75 to 5.25 V
      U37-8 (TSEN) - Body ground B Tension sensor 1 Engine switch on (IG) 0.5 to 4.5 V
      U37-10 (SG) - Body ground - - Always Below 1 Ω
      U37-12 (LCK1) - Body ground W 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)

      		 2.2 to 3.7 V
      U37-13 (REL2) - Body ground Y Electric parking brake switch release 2

      Engine switch on (IG)

      Electric parking brake switch off

      		 6.5 to 10 V

      Engine switch on (IG)

      Electric parking brake switch release (pull)

      		 2.8 to 5 V
      U37-14 (TGND) - Body ground G Tension sensor ground Always Below 1 Ω
      U37-15 (LCK2) - Body ground R Electric parking brake switch lock 2

      Engine switch on (IG)

      Electric parking brake switch off

      		 6.5 to 10 V

      Engine switch on (IG)

      Electric parking brake switch lock (push)

      		 2.8 to 5 V
      U37-16 (REL1) - Body ground G Electric parking brake switch release 1

      Engine switch on (IG)

      Electric parking brake switch off

      		 6.5 to 10 V

      Engine switch on (IG)

      Electric parking brake switch release (pull)

      		 2.8 to 5 V