ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) receives shift position information from the ECM via CAN communication.

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Engine switch is on (IG), 2) brake pedal is depressed, and 3) shift lever is moved out of P. When the shift lever is moved to P with these conditions met, the function automatically locks the parking brake.

The electric parking brake system AUTO (shift-linked function) automatically engages the parking brake when the shift level is moved to P and disengages the parking brake when the shift lever is moved out of P when the engine switch is on (IG) and the brake pedal is depressed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Check for DTCs.

      Click here

      
      Chassis > ABS/VSC/TRC/EPB > Trouble Codes

      Result
      Result Proceed to DTCs are not output A DTCs are output B

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

2. READ VALUE USING GTS (AUTO MODE)

   
   

   1. Turn the engine switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the engine switch on (IG).

   4. Turn the GTS on.

   5. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.

   6. Read the Data List according to the display on the GTS.

      OK
      On the GTS screen, ON or OFF is displayed accordingly.

      Tech Tips

      For details regarding mode switching: Click here

      
      Chassis > ABS/VSC/TRC/EPB > Data List

      Tester Display	Measurement Item	Range	Normal Condition
      Auto Mode	AUTO (shift-linked) mode permission status	ON or OFF	ON: AUTO (shift-linked) mode OFF: Manual mode

      
      Chassis > ABS/VSC/TRC/EPB > Data List

      Tester Display
      Auto Mode

      Result
      Proceed to OK NG

   
   

   NG

   GO TO STEP 5 Click here

   OK

3. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

   
   

   1. Remove the electric parking brake switch assembly.

      Click here

   2. Inspect the electric parking brake switch assembly.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY Click here

   OK

4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

   
   

   1. Disconnect the J85 electric parking brake switch assembly connector.

   2. Disconnect the A41 skid control ECU (brake actuator assembly) connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition A41-36 (LCK1) - J85-9 (LOK1) Always Below 5 Ω A41-23 (LCK2) - J85-10 (LOK2) Always Below 5 Ω A41-36 (LCK1) or J85-9 (LOK1) - Body ground Always 10 kΩ or higher A41-23 (LCK2) or J85-10 (LOK2) - Body ground Always 10 kΩ or higher A41-31 (REL1) - J85-1 (RLS1) Always Below 5 Ω A41-39 (REL2) - J85-2 (RLS2) Always Below 5 Ω A41-31 (REL1) or J85-1 (RLS1) - Body ground Always 10 kΩ or higher A41-39 (REL2) or J85-2 (RLS2) - Body ground Always 10 kΩ or higher J85-16 (GND1) - Body ground Always Below 5 Ω
      for RHD Tester Connection Condition Specified Condition A41-36 (LCK1) - J85-16 (LOK1) Always Below 5 Ω A41-23 (LCK2) - J85-15 (LOK2) Always Below 5 Ω A41-36 (LCK1) or J85-16 (LOK1) - Body ground Always 10 kΩ or higher A41-23 (LCK2) or J85-15 (LOK2) - Body ground Always 10 kΩ or higher A41-31 (REL1) - J85-8 (RLS1) Always Below 5 Ω A41-39 (REL2) - J85-7 (RLS2) Always Below 5 Ω A41-31 (REL1) or J85-8 (RLS1) - Body ground Always 10 kΩ or higher A41-39 (REL2) or J85-7 (RLS2) - Body ground Always 10 kΩ or higher J85-9 (GND1) - Body ground Always Below 5 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. READ VALUE USING GTS (SHIFT POSITION)

   
   

   1. Turn the engine switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the engine switch on (IG).

   4. Turn the GTS on.

   5. Enter the following menus: Chassis / ABS/VSC/TRC/EPB / Data List.

   6. Read the Data List according to the display on the GTS.

      
      Chassis > ABS/VSC/TRC/EPB > Data List

      Tester Display	Measurement Item	Range	Normal Condition
      Shift Position	Position of shift lever	P, N, R, D or Unknown	P: Shift lever in P N: Shift lever in N R: Shift lever in R D: Shift lever in D or M

      OK
      On the GTS screen, ON or OFF is displayed accordingly.

      
      Chassis > ABS/VSC/TRC/EPB > Data List

      Tester Display
      Shift Position

      Result
      Proceed to OK NG

   
   

   NG

   GO TO AUTOMATIC TRANSAXLE SYSTEM for U661E: Click here GO TO AUTOMATIC TRANSAXLE SYSTEM for U661F: Click here GO TO AUTOMATIC TRANSAXLE SYSTEM for U881E: Click here GO TO AUTOMATIC TRANSAXLE SYSTEM for U881F: Click here

   OK

6. READ VALUE USING GTS (STOP LIGHT SW)

   
   

   1. Turn the engine switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the engine switch on (IG).

   4. Turn the GTS on.

   5. Enter the following menus: Chassis / ABS/VSC/TRC/EPB / Data List.

   6. Read the Data List according to the display on the GTS.

      
      Chassis > ABS/VSC/TRC/EPB > Data List

      Tester Display	Measurement Item	Range	Normal Condition
      Stop Light SW	Stop light switch assembly input signal	OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed

      
      Chassis > ABS/VSC/TRC/EPB > Data List

      Tester Display
      Stop Light SW

      OK
      On the GTS screen, ON or OFF is displayed accordingly.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

   NG

   GO TO VEHICLE STABILITY CONTROL SYSTEM Click here