Lexus NX: Actuator Malfunction (C13A7)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| C13A7 | Actuator Malfunction | Both of following conditions are met:
|
| Yes | An electric parking brake system malfunction is displayed on the multi-information display. |
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
- This DTC may be stored when the system changes to pad replacement mode, but this is not a malfunction.
- This DTC may be stored when the parking brake is forcibly released, but this is not a malfunction.
- Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
- When replacing the parking brake ECU assembly, operate the electric parking brake switch (integration control and panel assembly), as the parking brake indicator light (red) blinks when the power switch is first turned on (IG).
PROCEDURE
| 1. | CHECK DTC |
(a) Check if DTCs other than C13A7 are output.
Click here
| DTC C13A7 is output | .gif) | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
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| 2. | READ VALUE USING TECHSTREAM (RH ACTUATOR MALFUNCTION(LOCK)/RH ACTUATOR MALFUNCTION(SPIN)/LH ACTUATOR MALFUNCTION(LOCK)/LH ACTUATOR MALFUNCTION(SPIN)) |
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG) and the Techstream on.
(d) Enter the following menus: Chassis / Electric Parking Brake / Data List.
(e) Check the values by referring to the table below.
Chassis > Electric Parking Brake > Data List| Tester Display | Measurement Item | Range | Normal Condition |
|---|---|---|---|
| RH Actuator Malfunction(Lock) | Parking brake actuator assembly RH lock detection malfunction details are displayed | Detected Malfunction or No Detected Malfunction | No Detected Malfunction |
| RH Actuator Malfunction(Spin) | Parking brake actuator assembly RH spinning malfunction details are displayed | Detected Malfunction or No Detected Malfunction | No Detected Malfunction |
| LH Actuator Malfunction(Lock) | Parking brake actuator assembly LH lock detection malfunction details are displayed | Detected Malfunction or No Detected Malfunction | No Detected Malfunction |
| LH Actuator Malfunction(Spin) | Parking brake actuator assembly LH spinning malfunction details are displayed | Detected Malfunction or No Detected Malfunction | No Detected Malfunction |
| Tester Display |
|---|
| RH Actuator Malfunction(Lock) |
| RH Actuator Malfunction(Spin) |
| LH Actuator Malfunction(Lock) |
| LH Actuator Malfunction(Spin) |
|
| 3. | INSPECT PARKING BRAKE WIRE ASSEMBLY NO.1 |
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| *1 | Parking Brake Wire Assembly | - | - |
| *A | RH | *B | LH |
| *a | Male connector | - | - |
(a) Remove the parking brake wire assembly.
Click here
(b) Check the parking brake wire assembly for damage.
OK:
No damage.
HINT:
If damaged, there may be a short between the wire harnesses or a short to ground.
(c) Inspect the parking brake wire assembly.
Standard Resistance:
LH| Tester Connection | Condition | Specified Condition |
|---|---|---|
| tm1 (Male connector)-1 - m2-2 (MRL+) | Always | Below 1 Ω |
| tm1 (Male connector)-3 - m2-1 (MRL-) | Always | Below 1 Ω |
| tm1 (Male connector)-1 - m2-1 (MRL-) | Always | 10 kΩ or higher |
| tm1 (Male connector)-3 - m2-2 (MRL+) | Always | 10 kΩ or higher |
| tm1 (Male connector)-1 - tm1 (Male connector)-3 | Always | 10 kΩ or higher |
| tm1 (Male connector)-1 - tm1 (Male connector)-2 | Always | 10 kΩ or higher |
| tm1 (Male connector)-1 - tm1 (Male connector)-4 | Always | 10 kΩ or higher |
| tm1 (Male connector)-3 - tm1 (Male connector)-2 | Always | 10 kΩ or higher |
| tm1 (Male connector)-3 - tm1 (Male connector)-4 | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| tm1 (Male connector)-2 - m1-2 (MRR+) | Always | Below 1 Ω |
| tm1 (Male connector)-4 - m1-1 (MRR-) | Always | Below 1 Ω |
| tm1 (Male connector)-2 - m1-1 (MRR-) | Always | 10 kΩ or higher |
| tm1 (Male connector)-4 - m1-2 (MRR+) | Always | 10 kΩ or higher |
| tm1 (Male connector)-2 - tm1 (Male connector)-4 | Always | 10 kΩ or higher |
| tm1 (Male connector)-2 - tm1 (Male connector)-1 | Always | 10 kΩ or higher |
| tm1 (Male connector)-2 - tm1 (Male connector)-3 | Always | 10 kΩ or higher |
| tm1 (Male connector)-4 - tm1 (Male connector)-1 | Always | 10 kΩ or higher |
| tm1 (Male connector)-4 - tm1 (Male connector)-3 | Always | 10 kΩ or higher |
| NG | | REPLACE PARKING BRAKE WIRE ASSEMBLY NO.1 |
|
| 4. | CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU 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 Q25 parking brake ECU assembly connector.
(d) Disconnect the m1 and/or m2 parking brake actuator assembly connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Q25-4 (MRL+) - m2-2 (MRL+) | Always | Below 1 Ω |
| Q25-6 (MRL-) - m2-1 (MRL-) | Always | Below 1 Ω |
| Q25-4 (MRL+) or m2-2 (MRL+) - Body ground | Always | 10 kΩ or higher |
| Q25-6 (MRL-) or m2-1 (MRL-) - Body ground | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Q25-1 (MRR+) - m1-2 (MRR+) | Always | Below 1 Ω |
| Q25-3 (MRR-) - m1-1 (MRR-) | Always | Below 1 Ω |
| Q25-1 (MRR+) or m1-2 (MRR+) - Body ground | Always | 10 kΩ or higher |
| Q25-3 (MRR-) or m1-1 (MRR-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | INSPECT REAR BRAKE AND PARKING BRAKE ACTUATOR ASSEMBLY |
(a) Enter rear brake pad replacement mode.
Click here
(b) Turn the power switch off.
(c) Check whether there is a rotation system stuck malfunction or the actuator is spinning.
(1) Check whether the parking brake actuator assembly is installed properly to the rear brake caliper and that it is not spinning.
For the parking brake actuator assembly removal procedure: Click here
(2) Check whether there is any damage to the rotation transmission part from the parking brake actuator assembly to the rear brake caliper.
(3) Inspect the parking brake actuator assembly and check that it operates.
Click here
(4) Check that the rear brake caliper threaded portion rotates and that the rear disc brake piston can move outward.
HINT:
For the check procedures, refer to the parking brake emergency release method when not using the Techstream.
Click here
HINT:
Return to normal mode after work is complete.
Click here
| OK | | REPLACE PARKING BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE NECESSARY PARTS |
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