Toyota Avalon Service & Repair Manual: Open or Short Circuit in Motor (C13A6)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A6

Open or Short Circuit in Motor

Both of following conditions are met:

  • Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
  • Power supply voltage and +B voltage are normal, but parking brake motor circuit is malfunctioning for approximately 1 to 2 seconds.
  • Parking brake actuator assembly
  • Wire harness or connector
  • Parking brake ECU (brake actuator 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

Voltage of power supplied to ECU is normal but malfunction exists in parking brake motor circuit

Detection Time

Approximately 1 to 2 seconds

Approximately 1 to 2 seconds

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • 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.

READ VALUE USING TECHSTREAM (PERMISSION OF RH INTERLOCKING PKB LOCK / PERMISSION OF LH INTERLOCKING PKB LOCK)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > Electric Parking Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Permission of RH Interlocking PKB Lock

Parking brake actuator assembly RH parking brake lock control permission status

OK or NG

OK

-

Permission of LH Interlocking PKB Lock

Parking brake actuator assembly RH parking brake lock control permission status

OK or NG

OK

-

Chassis > Electric Parking Brake > Data List

Tester Display

Permission of RH Interlocking PKB Lock

Permission of LH Interlocking PKB Lock

NEXT

2.

INSPECT PARKING BRAKE WIRE ASSEMBLY

*A

RH

*B

LH

*a

Front view of Parking Brake Wire Assembly

*b

(to wire harness connector)

*c

(to Parking Brake Actuator Assembly)

-

-

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Remove the parking brake wire assembly.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Inspect the parking brake wire assembly.

Standard Resistance:

RH

Tester Connection

Condition

Specified Condition

YK1-1 (MRR-) - Y4-1 (RE-)

Always

Below 1 Ω

YK1-1 (MRR-) or Y4-1 (RE-) - Body ground and other terminals

Always

10 kΩ or higher

YK1-2 (MRR+) - Y4-2 (RE+)

Always

Below 1 Ω

YK1-2 (MRR+) or Y4-2 (RE+) - Body ground and other terminals

Always

10 kΩ or higher

LH

Tester Connection

Condition

Specified Condition

YK2-1 (MRL-) - Y1-1 (LE-)

Always

Below 1 Ω

YK2-1 (MRL-) or Y1-1 (LE-) - Body ground and other terminals

Always

10 kΩ or higher

YK2-2 (MRL+) - Y1-2 (LE+)

Always

Below 1 Ω

YK2-2 (MRL+) or Y1-2 (LE+) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE PARKING BRAKE WIRE ASSEMBLY

OK

3.

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

(a) Turn the power switch off.

(b) Make sure the parking brake wire assembly is securely installed.

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

(d) Disconnect the Y4 or Y1 parking brake actuator assembly connector.

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

Standard Resistance:

RH

Tester Connection

Condition

Specified Condition

A39-4 (MRR+) - Y4-2 (RE+)

Always

Below 1 Ω

A39-3 (MRR-) - Y4-1 (RE-)

Always

Below 1 Ω

A39-4 (MRR+) or Y4-2 (RE+) - Body ground

Always

10 kΩ or higher

A39-3 (MRR-) or Y4-1 (RE-) - Body ground

Always

10 kΩ or higher

LH

Tester Connection

Condition

Specified Condition

A39-7 (MRL+) - Y1-2 (LE+)

Always

Below 1 Ω

A39-8 (MRL-) - Y1-1 (LE-)

Always

Below 1 Ω

A39-7 (MRL+) or Y1-2 (LE+) - Body ground

Always

10 kΩ or higher

A39-8 (MRL-) or Y1-1 (LE-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT PARKING BRAKE ACTUATOR ASSEMBLY

(a) Remove the parking brake actuator assembly.

Click here

(b) Inspect the parking brake actuator assembly.

Click here

OK

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

NG

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY

    Engine Switch/Power Switch Malfunction (C13A2)

    Actuator Malfunction (C13A7)

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