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 (electric parking brake switch assembly) is pulled to the lock side, a lock request signal is sent to the parking brake ECU assembly.

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

All of following conditions are met:


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

  2. Terminal LCK1 voltage is less than 2.3 V or more than 4.35 V; or terminal LCK2 voltage is less than 1.5 V* or more than 9.4 V*

  3. Malfunction occurs for approximately 1 second.

Tech Tips

*: When auxiliary battery voltage is 12 V

  • Electric parking brake switch (electric parking brake switch assembly)

  • Wire harness or connector

  • Parking brake ECU assembly

 DTC stored An electric parking brake system malfunction is displayed on the multi-information display.
C13AB/33 Lock Switch Circuit

Both of following conditions are met:


  1. Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power 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 (electric parking brake switch assembly)

  • Wire harness or connector

  • Parking brake ECU assembly

 DTC stored An electric parking brake system malfunction is displayed on the multi-information display.
DTC Detection Conditions: C13A3/31
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition Power switch on (IG) ○ ○ ○ ○
Malfunction Status Terminal LCK1 voltage is less than 2.3 V ○ - - -
Terminal LCK1 voltage is more than 4.35 V - ○ - -
Terminal LCK2 voltage is less than 1.5 V* - - ○ -
Terminal LCK2 voltage is more than 9.4 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 (electric parking brake switch assembly) pulled to lock side with power switch off ○ ○ ○ ○
Malfunction Status Terminal LCK1 voltage is less than 2.3 V ○ - - -
Terminal LCK1 voltage is more than 4.35 V - ○ - -
Terminal LCK2 voltage is less than 1.5 V* - - ○ -
Terminal LCK2 voltage is more than 9.4 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 auxiliary battery voltage is 12 V

DTC Detection Conditions: C13AC/34
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Power switch on (IG) ○ -
Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power 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

A001S05E15
*a Lock Switch (Pull)
*b Release Switch (Push)
*c Electric Parking Brake Switch (Electric Parking Brake Switch Assembly)
*d Parking Brake ECU Assembly

CAUTION / NOTICE / HINT

Note


  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

  • When the electric parking brake switch (electric parking brake switch assembly) is not fully pulled and held to the lock side for 1 second or more, only 1 of 2 internal contacts may contact causing a DTC to be stored. This is not a malfunction.

  • When replacing the parking brake ECU assembly, operate the electric parking brake switch (electric parking brake switch assembly) as the parking brake indicator light (red) blinks when the power switch is first turned on (IG).

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Inspect the electric parking brake switch (electric parking brake switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) Click here

    OK

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


    1. Disconnect the F67 electric parking brake switch (electric parking brake switch assembly) connector.

    2. Disconnect the M71 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
      M71-20 (LCK1) - F67-6 (LOK1) Always Below 5 Ω
      M71-15 (LCK2) - F67-3 (LOK2) Always Below 5 Ω
      M71-20 (LCK1) or F67-6 (LOK1) - Body ground Always 10 kΩ or higher
      M71-15 (LCK2) or F67-3 (LOK2) - Body ground Always 10 kΩ or higher
      F67-2 (GND1) - Body ground Always Below 5 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

    OK

  3. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > Electric Parking Brake > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Pull the electric parking brake switch (electric parking brake switch assembly) to the lock side.

      Tech Tips

      When the electric parking brake switch (electric parking brake switch assembly) is not fully pulled and held to the lock side for 1 second or more, only 1 of 2 internal contacts may contact causing a DTC to be stored. This is not a malfunction.

    5. Check for DTCs.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    A

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    B

    USE SIMULATION METHOD TO CHECK Click here