ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A1/12

DTC Code DTC Name
C13A1/12 Short in Power Supply Relay Circuit

DESCRIPTION

The following DTCs are stored when a malfunction occurs in the parking brake ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13A1/12 Short in Power Supply Relay 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. Parking brake ECU assembly power source relay shorted for approximately 60 seconds.

  • Wire harness or connector

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

  • Parking brake ECU assembly

 DTC stored An electric parking brake system malfunction is displayed on the multi-information display.
DTC Detection Conditions
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 Parking brake ECU assembly power source relay is shorted ○ ○
Detection Time Approximately 60 seconds Approximately 60 seconds
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

A001S7OE14

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - IG POWER SOURCE CIRCUIT)


    1. A001QTAC23
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      Turn the power switch off.

    2. Disconnect the M71 parking brake ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M71-5 (IG) - Body ground Power switch off Below 2.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. 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 (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) Click here

    OK

  3. 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. A001QTAC24
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      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) - Body ground Always 10 kΩ or higher
      M71-15 (LCK2) - Body ground Always 10 kΩ or higher
      M71-19 (REL1) - Body ground Always 10 kΩ or higher
      M71-16 (REL2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR