ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13AD/23

DTC Code DTC Name
C13AD/23 Open in +B Circuit

DESCRIPTION

The parking brake ECU assembly operates the parking brake motor RH and LH with power supplied from the +B and +B2 terminals.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13AD/23 Open in +B 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. When parking brake motor is not operating, +B voltage is less than 8.5 V* or when parking brake motor is operating, +B voltage is less than 3.5 V*

  3. When parking brake motor is not operating, malfunction is detected for approximately 1 second

    When parking brake motor is operating, malfunction is detected for approximately 0.5 seconds

Tech Tips

*: When the auxiliary battery voltage is 12 V.

  • 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:
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition Power switch on (IG) ○ - ○ -
Electric parking brake switch (electric parking brake switch assembly) pushed to release side with power switch off - ○ - ○
Malfunction Status When parking brake is not operating: +B voltage is less than 8.5 V* ○ ○ - -
When parking brake is operating: +B voltage is less than 3.5 V* - - ○ ○
Detection Time Approximately 1 second Approximately 1 second Approximately 0.5 seconds Approximately 0.5 seconds
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 the auxiliary battery voltage is 12 V.

WIRING DIAGRAM

A001RIOE08
*1 EPB NO. 1
*2 EPB NO. 2
*3 Parking Brake ECU Assembly

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. READ VALUE USING GTS (ECU +B1 VOLTAGE / ECU +B2 VOLTAGE)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

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

    6. Check the Data List.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      ECU +B1 Voltage Skid control ECU (brake booster with master cylinder assembly) +B1 voltage 0.00 to 20.00 V 11 to 14 V -
      ECU +B2 Voltage Skid control ECU (brake booster with master cylinder assembly) +B2 voltage 0.00 to 20.00 V 11 to 14 V -

      Chassis > Electric Parking Brake > Data List
      Tester Display
      ECU +B1 Voltage
      ECU +B2 Voltage
      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 M70 parking brake ECU assembly connector.

    3. A001PIOC05
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      M70-7 (+B) - Body ground Always 11 to 14 V
      M70-12 (+B2) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR