Lexus NX: 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:
|
| Yes | An electric parking brake system malfunction is displayed on the multi-information display. |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- 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. | READ VALUE USING TECHSTREAM (RH ACTUATOR MOTOR MALFUNCTION(OPEN/SHORT) / LH ACTUATOR MOTOR MALFUNCTION(OPEN/SHORT)) |
(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 Motor Malfunction(Open/Short) | Parking brake motor RH (parking brake actuator assembly RH) open circuit or short circuit malfunction display | Detected Malfunction or No Detected Malfunction | No Detected Malfunction |
| LH Actuator Motor Malfunction(Open/Short) | Parking brake motor LH (parking brake actuator assembly LH) open circuit or short circuit malfunction display | Detected Malfunction or No Detected Malfunction | No Detected Malfunction |
| Tester Display |
|---|
| RH Actuator Motor Malfunction(Open/Short) |
| LH Actuator Motor Malfunction(Open/Short) |
|
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| 2. | INSPECT PARKING BRAKE WIRE ASSEMBLY NO.1 |
| *1 | Parking Brake Wire Assembly | - | - |
| *A | RH | *B | LH |
| *a | Male connector | - | - |
(a) Remove the parking brake wire assembly.
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(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 | .gif) | REPLACE PARKING BRAKE WIRE ASSEMBLY NO.1 |
|
| 3. | 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 |
|
| 4. | INSPECT PARKING BRAKE ACTUATOR ASSEMBLY |
(a) Inspect the parking brake actuator assembly.
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| OK | | REPLACE PARKING BRAKE ECU ASSEMBLY |
| NG | | REPLACE PARKING BRAKE ACTUATOR ASSEMBLY |
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