DTC C13A6: Open or Short Circuit in Motor [06/2018 - 07/2019]: Procedure

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Chassis / Electric Parking Brake / Data List.
6. 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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the parking brake wire assembly.
2. 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.

3. 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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARKING BRAKE WIRE ASSEMBLY 

Result: 

OK 

See step  3

1. Turn the power switch off.
2. Make sure the parking brake wire assembly is securely installed.
3. Disconnect the A54 parking brake ECU (brake actuator assembly) connector.
4. Disconnect the b1 or b3 parking brake actuator assembly connector.
5. 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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the parking brake actuator assembly.

   Refer to REMOVAL [06/2018 - ]

2. Inspect the parking brake actuator assembly.

   Refer to INSPECTION [06/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2021] 

Result: 

NG 

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - ]