ELECTRIC PARKING BRAKE SYSTEM TERMINALS OF ECU


  1. CHECK PARKING BRAKE ECU ASSEMBLY

    A01HGCLC01
    *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
      Q25-7 (+B) - Body ground B Parking brake motor RH (Parking brake actuator assembly RH) power supply Always 11 to 14 V
      Q25-9 (GND1) - Body ground W-B Ground Always Below 1 Ω
      Q25-12 (+B2) - Body ground W Parking brake motor LH (Parking brake actuator assembly LH) power supply Always 11 to 14 V
      Q24-3 (BECU) - Body ground B Parking brake ECU assembly power supply Always 11 to 14 V
      Q24-5 (IG) - Body ground V IG power supply Engine switch on (IG) 11 to 14 V

    3. Connect the parking brake ECU assembly connectors.

      A01HHRUC02
      *a

      Component with harness connected

      (Parking Brake ECU Assembly)

      		 - -

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q25-1 (MRR+) - Body ground B Parking brake motor RH (Parking brake actuator assembly RH) (+)

      • Engine switch on (IG)

      • Parking brake not operating

      		 3.9 to 6.2 V
      Q25-3 (MRR-) - Body ground W Parking brake motor RH (Parking brake actuator assembly RH) (-)

      • Engine switch on (IG)

      • Parking brake not operating

      		 3.9 to 6.2 V
      Q25-4 (MRL+) - Body ground L Parking brake motor LH (Parking brake actuator assembly LH) (+)

      • Engine switch on (IG)

      • Parking brake not operating

      		 3.9 to 6.2 V
      Q25-6 (MRL-) - Body ground R Parking brake motor LH (Parking brake actuator assembly LH) (-)

      • Engine switch on (IG)

      • Parking brake not operating

      		 3.9 to 6.2 V
      Q24-4 (TX) - Body ground R Combination meter assembly communication signal 20 seconds after engine switch turned off 9 to 14 V
      Q24-13 (LPA) - Body ground G AUTO indicator light

      • Engine switch on (IG)

      • AUTO indicator light off

      		 9 to 14 V
      Q24-14 (POL) - Body ground P Electric parking brake switch indicator light

      • Engine switch on (IG)

      • Electric parking brake switch indicator light off

      		 9 to 14 V
      Q24-15 (LCK2) - Body ground W Electric parking brake switch (Integration control and panel assembly) lock 2

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) off (released)

      		 6.5 to 10 V

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) pulled and held to lock side

      		 2.8 to 5 V
      Q24-16 (REL2) - Body ground R Electric parking brake switch (Integration control and panel assembly) release 2

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) off (released)

      		 6.5 to 10 V

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) pushed and held to release side

      		 2.8 to 5 V
      Q24-19 (REL1) - Body ground L Electric parking brake switch (Integration control and panel assembly) release 1

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) off (released)

      		 6.5 to 10 V

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) pushed and held to release side

      		 2.8 to 5 V
      Q24-20 (LCK1) - Body ground B Electric parking brake switch (Integration control and panel assembly) lock 1

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) off (released)

      		 1.8 to 3.3 V

      • Engine switch on (IG)

      • Electric parking brake switch (Integration control and panel assembly) pulled and held to lock side

      		 2.2 to 3.7 V