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ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A4, C13AC

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DTC Code DTC Name
C13A4 Open or Short Circuit in Release Switch Circuit
C13AC Release Switch Circuit Comparison
Figure 1. Threshold Changes According to BECU Terminal Voltage *a BECU Terminal Voltage (V) *b REL1 or REL2 Terminal Voltage (V) *c Normal Range *d DTC Detection Range
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DESCRIPTION

When the electric parking brake switch assembly is pulled to the release side, a release request signal is output to the parking brake ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13A4 Open or Short Circuit in Release Switch Circuit

  • Diagnosis Condition:

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

  • Malfunction Status:

    REL1 or REL2 terminal voltage is below 1.4 V (*) or above 9 V (*)

  • Malfunction Duration:

    Approximately 1 second

Tip:

*: 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.
C13AC Release Switch Circuit Comparison

  • Diagnosis Condition:

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

  • Malfunction Status:

    Release 1 switch and release 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.
Table 1. DTC Detection Condition Combination Table:C13A4 (Pattern1, Pattern2, Pattern3, Pattern4)
  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 REL1 terminal voltage is below 1.4 V (*) ○ - ○ -
REL1 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
Table 2. DTC Detection Condition Combination Table: C13A4 (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 REL2 terminal voltage is below 1.4 V (*) ○ - ○ -
REL2 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
Tip:

  • 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".

Table 3. DTC Detection Condition Combination Table: C13AC
  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 Release 1 switch and release 2 switch ON/OFF evaluations do not match ○ ○
Detection Time Repeats 5 times Repeats 5 times
Trip Count 1 trip 1 trip
Tip:

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

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WIRING DIAGRAM

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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 pulled and held for 1 second or more without being pulled fully to the release 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.

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PROCEDURE


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    INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY


    1. Inspect the electric parking brake switch assembly.

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      Result
      Proceed to
      OK
      NG

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    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
      L77-16 (REL1) - G43-8 (RLS1) Always Below 5 Ω
      L77-13 (REL2) - G43-9 (RLS2) Always Below 5 Ω
      L77-16 (REL1) or G43-8 (RLS1) - Body ground Always 10 kΩ or higher
      L77-13 (REL2) or G43-9 (RLS2) - Body ground Always 10 kΩ or higher
      G43-14 (GND1) - Body ground Always Below 5 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK DTC


    1. Clear the DTCs.

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      1. Chassis > Electric Parking Brake > Clear DTCs


    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Perform a release operation with the electric parking brake switch assembly.

      Tip:

      When the electric parking brake switch assembly is pulled and held for 1 second or more without being pulled fully to the release 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.

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      1. Chassis > Electric Parking Brake > Trouble Codes


      Result
      Result Proceed to
      DTC is output A
      DTC is not output B