DTC C13A7: Actuator Malfunction [04/2018 - 08/2021]: Procedure

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [04/2018 - 08/2021]

   Chassis > Electric Parking Brake > Trouble Codes 

   Result

   Result	Proceed to
   Only DTC C13A7 is output	A
   DTCs other than C13A7 are output	B

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2019 - 08/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021] 

Result: 

A 

See step  2

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  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the engine switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   OK

   The connector is securely connected.

3. Remove the parking brake wire assembly.
4. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

5. 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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARKING BRAKE WIRE ASSEMBLY 

Result: 

OK 

See step  4

1. Turn the power switch off.
2. Make sure the parking brake wire assembly is securely installed.
3. Disconnect the A39 parking brake ECU (brake actuator assembly) connector.
4. Disconnect the Y4 or Y1 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
   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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Enter rear brake pad replacement mode.

   Refer to TEST MODE PROCEDURE [04/2018 - 08/2021]

2. Turn the power switch off.
3. Check that the rotating parts are not seized or the actuator is not spinning freely.
   1. Check that the parking brake actuator assembly is installed properly to the rear brake caliper and that it is not spinning freely.

      For the parking brake actuator assembly removal procedure: Refer to REMOVAL [04/2018 -]

   2. Check that there is no damage to the rotating parts from the parking brake actuator assembly to the rear brake caliper.
   3. Inspect the parking brake actuator assembly and check that it operates correctly.

      Refer to INSPECTION [04/2018 -]

   4. Check that the rear brake caliper threaded part rotates and that the rear disc brake piston moves outward.

      HINT: 

      For the check procedures, refer to the parking brake forced release method when not using the Techstream.

      Refer to OPERATION METHOD [04/2018 -]

   HINT: 

   Return to normal mode after work is complete.

   Refer to TEST MODE PROCEDURE [04/2018 - 08/2021]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [04/2018 -] 

Result: 

NG 

REPAIR OR REPLACE NECESSARY PARTS