Toyota Avalon Service & Repair Manual: Short circuit in Power source circuit (C13A1)

DESCRIPTION

C13A1 is stored if the power supply relay in the parking brake ECU assembly has a short circuit.

C13A1 is stored if the power switch is off and a voltage of 2.5 V or higher is applied to the IG terminal and an electric parking brake switch assembly malfunction or wire harness malfunction between the switch and ECU occurs.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A1

Short circuit in Power source circuit

Both of following conditions are met:

  • Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
  • Parking brake ECU (brake actuator 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 (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following 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.
  • The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (BEPB CIRCUIT)

*a

Front view of wire harness connector

(to Parking Brake ECU (Brake Actuator Assembly))

(a) Turn the power switch off.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A39-9 (BEPB) - Body ground

Power switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

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

*a

Front view of wire harness connector

(to Parking Brake ECU (Brake Actuator Assembly))

(a) Turn the power switch off.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A39-26 (IG) - Body ground

Power switch off

Below 2.5 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Remove the electric parking brake switch (electric parking brake switch assembly).

Click here

(b) Inspect the electric parking brake switch (electric parking brake switch assembly).

Click here

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

OK

4.

CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

*a

Front view of wire harness connector

(to Parking Brake ECU (Brake Actuator Assembly))

(a) Disconnect the G24 electric parking brake switch (electric parking brake switch assembly) connector.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A39-14 (SWI1) - Body ground

Always

10 kΩ or higher

A39-20 (SWO1) - Body ground

Always

10 kΩ or higher

A39-24 (SWI2) - Body ground

Always

10 kΩ or higher

A39-22 (SWO2) - Body ground

Always

10 kΩ or higher

OK

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Open circuit in Power source circuit (C13A0,C13A5,C13B0)

    Engine Switch/Power Switch Malfunction (C13A2)

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