ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A3/31, C13AB/33

DTC Code DTC Name
C13A3/31 Open or Short in Lock Switch Circuit
C13AB/33 Lock Switch Circuit

DESCRIPTION

When the electric parking brake switch assembly is pulled to the lock side, a lock request signal is output to the parking brake ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
C13A3/31 Open or Short in Lock Switch Circuit

All of following conditions are met:


  1. Engine switch on (IG) or electric parking brake switch assembly pulled to lock side with engine switch off.

  2. Terminal LCK1 voltage is less than 2.3 V or more than 4.2 V; or terminal LCK2 voltage is less than 1.4 V* or more than 9 V*

  3. Problem occurs for approximately 1 second

Tech Tips

*: When battery voltage is 11 V

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Parking brake ECU assembly
C13AB/33 Lock Switch Circuit

Both of following conditions are met:


  1. Engine switch on (IG) or electric parking brake switch assembly pulled to lock side with engine switch off.

  2. ON/OFF judgment of lock switch 1 and lock switch 2 does not match for approximately 1 second

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Parking brake ECU assembly
DTC Detection Conditions: C13A3/31
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition Engine switch on (IG) ○ ○ ○ ○
Malfunction Status Terminal LCK1 voltage is less than 2.3 V ○ - - -
Terminal LCK1 voltage is more than 4.2 V - ○ - -
Terminal LCK2 voltage is less than 1.4 V* - - ○ -
Terminal LCK2 voltage is more than 9 V* - - - ○
Detection Time Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second
Number of Trips 1 trip 1 trip 1 trip 1 trip
DTC Detection Conditions: C13A3/31
Vehicle Condition
Pattern 5 Pattern 6 Pattern 7 Pattern 8
Diagnosis Condition Electric parking brake switch assembly pulled to lock side with engine switch off ○ ○ ○ ○
Malfunction Status Terminal LCK1 voltage is less than 2.3 V ○ - - -
Terminal LCK1 voltage is more than 4.2 V - ○ - -
Terminal LCK2 voltage is less than 1.4 V* - - ○ -
Terminal LCK2 voltage is more than 9 V* - - - ○
Detection Time Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second
Number of Trips 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.


  • *: When battery voltage is 11 V

DTC Detection Conditions: C13AC/34
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch on (IG) ○ -
Electric parking brake switch assembly pulled to lock side with engine switch off - ○
Malfunction Status ON/OFF judgment of lock switch 1 and lock switch 2 does not match ○ ○
Detection Time Approximately 1 second Approximately 1 second
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B002CQOE01
*a Lock Switch (Push)
*b Release Switch (Pull)
*c Electric Parking Brake Switch Assembly
*d Parking Brake ECU Assembly

CAUTION / NOTICE / HINT

Note


  • Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.

  • When the electric parking brake switch assembly is pulled and held for 1 second or more without being pulled fully to the lock side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).

  • If the parking brake ECU assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures.

    Click here

PROCEDURE


  1. 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

  2. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Disconnect the K19 electric parking brake switch assembly connector.

    2. Disconnect the U30 parking brake ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U30-12 (LCK1) - K19-6 (LOK1) Always Below 5 Ω
      U30-15 (LCK2) - K19-8 (LOK2) Always Below 5 Ω
      U30-12 (LCK1) or K19-6 (LOK1) - Body ground Always 10 kΩ or higher
      U30-15 (LCK2) or K19-8 (LOK2) - Body ground Always 10 kΩ or higher
      K19-7 (GND1) - Body ground Always Below 5 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > Electric Parking Brake > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Perform a lock operation with the electric parking brake switch assembly.

      Tech Tips

      When the electric parking brake switch assembly is pulled and held for 1 second or more without being pulled fully to the lock side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).

    5. Check for DTCs.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    A

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    B

    USE SIMULATION METHOD TO CHECK Click here