ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13AD

DTC Code DTC Name
C13AD Open in +B Circuit

DESCRIPTION

The parking brake ECU assembly is supplied with power to operate the motor via the +B terminals.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13AD Open in +B Circuit

  • 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:

    +B voltage is below 8.47 V (*) when parking brake motor is not operating or +B voltage is below 3.19 V (*) when parking brake motor is operating

  • Malfunction Duration:

    Not operating: Approximately 1 second

    Operating: Approximately 0.5 seconds

Tech Tips

*: This value is based on the assumption that the auxiliary battery voltage is 11 V.

The threshold changes according to the auxiliary battery voltage.

For details, refer to "Threshold Changes According to Auxiliary Battery Voltage".

  • 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: C13AD (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 ○ ○ ○ ○
Malfunction Status +B voltage is below 8.47 V (*) when parking brake motor is not operating ○ ○ - -
+B voltage is below 3.19 V (*) when parking brake motor is not operating - - ○ ○
Detection Time Not operating: Approximately 1 second Operating: Approximately 0.5 seconds Not operating: Approximately 1 second Operating: Approximately 0.5 seconds
Trip Count 1 trip 1 trip 1 trip 1 trip
DTC Detection Condition Combination Table: C13AD (Pattern 5, Pattern 6, Pattern 7, Pattern 8)
Vehicle Condition
Pattern 5 Pattern 6 Pattern 7 Pattern 8
Diagnosis Condition Power switch on (IG) ○ ○ ○ ○
Malfunction Status +B voltage is below 8.47 V (*) when parking brake motor is not operating ○ ○ - -
+B voltage is below 3.19 V (*) when parking brake motor is not operating - - ○ ○
Detection Time Not operating: Approximately 1 second Operating: Approximately 0.5 seconds Not operating: Approximately 1 second Operating: Approximately 0.5 seconds
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 auxiliary battery voltage is 11 V.

    The threshold changes according to the auxiliary battery voltage.

    For details, refer to "Threshold Changes According to Auxiliary Battery Voltage".

Figure 1. Threshold Changes According to Auxiliary Battery Voltage

B004VQZC02
*a Parking Brake Motor Not Operating *b Parking Brake Motor Operating
*c Auxiliary Battery Voltage (V) *d +B Terminal Voltage (V)
*e Normal Range *f DTC Detection Range

WIRING DIAGRAM

B004XJYE07

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.

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

    Click here

PROCEDURE


  1. READ VALUE USING GTS (+B VOLTAGE VALUE)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG) and the GTS on.

    4. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    5. Check the values by referring to the table below.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      +B Voltage Value Electric parking brake motor power source information display Lo, Mid or Hi Hi -

      Chassis > Electric Parking Brake > Data List
      Tester Display
      +B Voltage Value
      OK
      Values are as shown in normal condition.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - AUXILIARY BATTERY)


    1. Turn the power switch off.

    2. Disconnect the 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
      L76-8 (+B)- Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR