Electric Parking Brake System Auto Function Circuit

PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM: Electric Parking Brake System AUTO Function Circuit
- Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The electric parking brake ECU receives shift position information from the hybrid vehicle control ECU through CAN communication. When the power switch is ON (IG) and the electric parking brake switch AUTO switch is turned ON, the electric parking brake system AUTO function operates as follows: 1) when the brake pedal is depressed and the shift lever is moved from P to a position other than P, parking brake release control automatically operates; or 2) when the brake pedal is depressed and the shift lever is moved from a position other than P to P, parking brake lock control automatically operates.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* If the electric parking brake ECU or electric parking brake actuator is replaced, perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Programming and Relearning.
* Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.

PROCEDURE

1. CHECK AUTO SWITCH (DATA LIST)

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(e) Check the values by referring to the table below.

Electric Parking Brake





Result





B -- CHECK SHIFT LEVER POSITION SIGNAL (DATA LIST)
A -- Continue to next step.

2. INSPECT ELECTRIC PARKING BRAKE SWITCH (AUTO SWITCH)

(a) Remove the electric parking brake switch Removal.

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





Standard resistance:





NG -- REPLACE ELECTRIC PARKING BRAKE SWITCH Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)

(a) Disconnect the S48 ECU connector.

(b) Disconnect the L39 switch connector.

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





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK SHIFT LEVER POSITION SIGNAL (DATA LIST)

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(e) Check the values by referring to the table below.

Electric Parking Brake





OK:

On tester screen, item changes between ON and OFF according to shift lever operation.

NG -- GO TO HYBRID CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How To Proceed With Troubleshooting
OK -- Continue to next step.

5. CHECK STOP LIGHT SWITCH SIGNAL (DATA LIST)

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(e) Check the values by referring to the table below.

Electric Parking Brake





OK:

On tester screen, item changes between ON and OFF according to switch operation.

NG -- GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How To Proceed With Troubleshooting
OK -- Continue to next step.

6. CHECK AUTO SWITCH LIGHT OPERATION (ACTIVE TEST)

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Electric Parking Brake / Active Test.

(e) Check the values by referring to the table below.

Electric Parking Brake





OK:

Switch light turns on when operating the tester.

NG -- INSPECT FUSE (D-IG1-3)

OK -- REPLACE ELECTRIC PARKING BRAKE ECU Removal

7. INSPECT FUSE (D-IG1-3)

(a) Remove the D-IG1-3 fuse from the main body ECU.

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

Standard resistance:





Result





B -- CHECK HARNESS AND CONNECTOR (SWITCH - AUXILIARY BATTERY)
A -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (SWITCH - FUSE)

(a) Disconnect the L39 switch connector.

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





Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)

(a) Disconnect the S46 ECU connector.

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





Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

OK -- REPLACE FUSE

10. CHECK HARNESS AND CONNECTOR (SWITCH - AUXILIARY BATTERY)

(a) Disconnect the L39 switch connector.

(b) Measure the voltage according to the value(s) in the table below.





Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (SWITCH - ECU)

(a) Disconnect the S46 ECU connector.

(b) Disconnect the L39 switch connector.

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





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ELECTRIC PARKING BRAKE ECU Removal