Lexus NX: Short Circuit in Power Source Circuit (C13A1)
DESCRIPTION
The following DTCs are stored when a malfunction occurs in the parking brake ECU assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| C13A1 | Short Circuit in Power Source Circuit | 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:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- 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 HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - IG POWER SOURCE CIRCUIT) |
| (a) Turn the power switch off. |
|
(b) Disconnect the parking brake ECU assembly connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| Q24-5(IG) - Body ground | Power switch off | Below 2.5 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | INSPECT ELECTRIC PARKING BRAKE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) |
(a) Remove the electric parking brake switch (integration control and panel assembly).
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(b) Inspect the electric parking brake switch (integration control and panel assembly).
Click here
| NG | | REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)) |
(a) Disconnect the I35 electric parking brake switch (integration control and panel assembly) connector.
| (b) Disconnect the parking brake ECU assembly connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Q24-20 (LCK1) - Body ground | Always | 10 kΩ or higher |
| Q24-15 (LCK2) - Body ground | Always | 10 kΩ or higher |
| Q24-16 (REL2) - Body ground | Always | 10 kΩ or higher |
| Q24-19 (REL1) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE PARKING BRAKE ECU ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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