ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A3, C13AB

DTC Code DTC Name
C13A3 Open or Short Circuit in Lock Switch Circuit
C13AB Lock Switch Circuit Comparison

DESCRIPTION

When the electric parking brake switch assembly is pushed 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 Memory Note
C13A3 Open or Short Circuit in Lock Switch Circuit

    Detection Condition 1:

  • Diagnosis Condition:

    Electric parking brake switch assembly is operated to lock side with power switch off or power switch is turned on (IG)

  • Malfunction Status:

    LCK1 terminal voltage is below 2.3 V or 4.35 V or more

  • Malfunction Duration:

    Approximately 1 second


    Detection Condition 2:

  • Diagnosis Condition:

    Electric parking brake switch assembly is operated to lock side with power switch off or power switch is turned on (IG)

  • Malfunction Status:

    LCK2 terminal voltage is below 1.4 V (*) or above 9 V (*)

  • Malfunction Duration:

    Approximately 1 second

Tech Tips

*: This value is based on the assumption that the BECU terminal voltage is 11 V.

The threshold changes according to the BECU terminal voltage.

For details, refer to "Threshold Changes According to BECU Terminal Voltage".

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Parking brake ECU assembly

 Yes An electric parking brake system malfunction is displayed on the multi-information display.
C13AB Lock Switch Circuit Comparison

  • Diagnosis Condition:

    Electric parking brake switch assembly is operated to lock side with power switch off or power switch is turned on (IG)

  • Malfunction Status:

    Lock 1 switch and lock 2 switch ON/OFF evaluations do not match

  • Malfunction Duration:

    The malfunction status repeats 5 times

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Parking brake ECU assembly

 Yes An electric parking brake system malfunction is displayed on the multi-information display.
DTC Detection Condition Combination Table:C13A3 (Pattern 1, Pattern 2, Pattern 3, Pattern 4)
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition Electric parking brake switch assembly is operated to lock side with power switch off ○ ○ - -
Power switch on (IG) - - ○ ○
Malfunction Status LCK1 terminal voltage is below 2.3 V ○ - ○ -
LCK1 terminal voltage is 4.35 V or more - ○ - ○
Detection Time Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second
Trip Count 1 trip 1 trip 1 trip 1 trip

Tech Tips

If the conditions match either of these patterns, a DTC will be output.

DTC Detection Condition Combination Table: C13A3 (Pattern 5, Pattern 6, Pattern 7, Pattern 8)
Vehicle Condition
Pattern 5 Pattern 6 Pattern 7 Pattern 8
Diagnosis Condition Electric parking brake switch assembly is operated to lock side with power switch off ○ ○ - -
Power switch on (IG) - - ○ ○
Malfunction Status LCK2 terminal voltage is below 1.4 V (*) ○ - ○ -
LCK2 terminal voltage is above 9 V (*) - ○ - ○
Detection Time Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second
Trip Count 1 trip 1 trip 1 trip 1 trip

Tech Tips


  • If the conditions match either of these patterns, a DTC will be output.

  • *: This value is based on the assumption that the BECU terminal voltage is 11 V.

    The threshold changes according to the BECU terminal voltage.

    For details, refer to "Threshold Changes According to BECU Terminal Voltage".

Figure 1. Threshold Changes According to BECU Terminal Voltage

B004XVAC01
*a BECU Terminal Voltage (V)
*b LCK2 Terminal Voltage (V)
*c Normal Range
*d DTC Detection Range
DTC Detection Condition Combination Table: C13AB
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Electric parking brake switch assembly is operated to lock side with power switch off ○ -
Power switch on (IG) - ○
Malfunction Status Lock 1 switch and lock 2 switch ON/OFF evaluations do not match ○ ○
Detection Time Repeats 5 times Repeats 5 times
Trip Count 1 trip 1 trip

Tech Tips

If the conditions match either of these patterns, a DTC will be output.

WIRING DIAGRAM

B004TYAE14
*a Lock Switch (Push)
*b Release Switch (Pull)
*c 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 assembly is pushed and held for 1 second or more without being pushed 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.

  • 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. 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. Turn the power switch off.

    2. Disconnect the G43 electric parking brake switch assembly connector.

    3. Disconnect the L77 parking brake ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L77-12 (LCK1) - G43-1 (LOK1) Always Below 5 Ω
      L77-15 (LCK2) - G43-2 (LOK2) Always Below 5 Ω
      L77-12 (LCK1) or G43-1 (LOK1) - Body ground Always 10 kΩ or higher
      L77-15 (LCK2) or G43-2 (LOK2) - Body ground Always 10 kΩ or higher
      G43-14 (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 power switch off.

    3. Turn the power 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 pushed and held for 1 second or more without being pushed 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.

    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