Lexus ES manuals

Lexus ES: Open or Short Circuit in Motor (C13A6)

Lexus ES (XZ10) Service Manual / Brake / Parking Brake / Electric Parking Brake System (for Hv Model) / 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
Detection conditions (1)
  • Diagnosis Condition:

    Power switch on (IG) or electric parking brake switch assembly pushed to lock side with power switch off

  • Malfunction Status:

    Power supply voltage and +B voltage are normal, but parking brake motor circuit

  • Detection Time:

    Approximately 1 to 2 seconds

Detection conditions (2)
  • Diagnosis Condition:

    Power switch turned from off to on (IG)

  • Malfunction Status:

    Overcurrent detected continuously from parking brake motor circuit

  • Detection Time:

    Approximately 1 second

Detection conditions (3)
  • Diagnosis Condition:

    With the power switch on (IG), the electric parking brake switch assembly is changed from lock to release or release to lock 3 times repeatedly

  • Malfunction Status:

    Overcurrent detected continuously from parking brake motor circuit

  • Detection Time:

    -
  • Parking brake actuator assembly
  • No. 1 Parking Brake Wire Assembly
  • No. 2 Parking Brake Wire Assembly
  • Wire harness and 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

Pattern 3

Pattern 4

Pattern 5

Diagnosis Condition

Power switch on (IG)

○

-

-

-

-

Electric parking brake switch assembly pushed to lock side with power switch off

-

○

-

-

-

Power switch turned from off to on (IG)

-

-

○

-

-

With power switch on (IG), electric parking brake switch assembly is changed from lock to release 3 times repeatedly

-

-

-

○

-

With power switch on (IG), electric parking brake switch assembly is changed from release to lock 3 times repeatedly

-

-

-

-

-

Malfunction Status

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

○

○

-

-

○

Overcurrent is detected in the parking brake motor circuit continuously.

-

-

○

○

○

Detection Time

Approximately 1 to 2 seconds

Approximately 1 to 2 seconds

Approximately 1 second

-

-

Number of Trips

1 trip

1 trip

1 trip

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 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) Remove the parking brake wire assembly.

(b) Check the parking brake wire assembly for damage.

OK:

No damage.

HINT:

If damaged, there may be a short in the wire harness or a short to ground.

(c) Inspect the parking brake wire assembly.

Standard Resistance:

RH

Tester Connection

Condition

Specified Condition

bN3-1 (MRR-) - b1-1 (RE-)

Always

Below 1 Ω

bN3-1 (MRR-) - b1-2 (RE+)

Always

10 kΩ or higher

bN3-1 (MRR-) or b1-1 (RE-) - Body ground

Always

10 kΩ or higher

bN3-2 (MRR+) - b1-2 (RE+)

Always

Below 1 Ω

bN3-2 (MRR+) - b1-1 (RE-)

Always

10 kΩ or higher

bN3-2 (MRR+) or b1-2 (RE+) - Body ground

Always

10 kΩ or higher
LH

Tester Connection

Condition

Specified Condition

bN4-1 (MRL-) - b3-1 (LE-)

Always

Below 1 Ω

bN4-1 (MRL-) - b3-2 (LE+)

Always

10 kΩ or higher

bN4-1 (MRL-) or b3-1 (LE-) - Body ground

Always

10 kΩ or higher

bN4-2 (MRL+) - b3-2 (LE+)

Always

Below 1 Ω

bN4-2 (MRL+) - b3-1 (LE-)

Always

10 kΩ or higher

bN4-2 (MRL+) or b3-2 (LE+) - Body ground

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 A54 parking brake ECU (brake actuator assembly) connector.

(d) Disconnect the b1 or b3 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

A54-4 (MRR+) - b1-2 (RE+)

Always

Below 1 Ω

A54-3 (MRR-) - b1-1 (RE-)

Always

Below 1 Ω

A54-4 (MRR+) or b1-2 (RE+) - Body ground

Always

10 kΩ or higher

A54-3 (MRR-) or b1-1 (RE-) - Body ground

Always

10 kΩ or higher
LH

Tester Connection

Condition

Specified Condition

A54-7 (MRL+) - b3-2 (LE+)

Always

Below 1 Ω

A54-8 (MRL-) - b3-1 (LE-)

Always

Below 1 Ω

A54-7 (MRL+) or b3-2 (LE+) - Body ground

Always

10 kΩ or higher

A54-8 (MRL-) or b3-1 (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

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