Lexus NX: Open or Short Circuit in Release Switch Circuit (C13A4,C13AC)
DESCRIPTION
When the electric parking brake switch (integration control and panel assembly) is pushed to the release side, a release request signal is output to the parking brake ECU assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| C13A4 | Open or Short Circuit in Release Switch Circuit | All of following conditions are met:
HINT: *: When auxiliary battery voltage is 12 V |
| Yes | An electric parking brake system malfunction is displayed on the multi-information display. |
| C13AC | Release Switch Circuit Comparison | 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:
- Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
- When the electric parking brake switch (integration control and panel assembly) is pushed and held for 1 second or more without being pushed fully to the release side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).
- 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. | 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).
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| NG | .gif) | REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY |
|
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| 2. | 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 Q24 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 |
|---|---|---|
| Q24-19 (REL1) - I35-1 (RLS1) | Always | Below 5 Ω |
| Q24-16 (REL2) - I35-2 (RLS2) | Always | Below 5 Ω |
| Q24-19 (REL1) or I35-1 (RLS1) - Body ground | Always | 10 kΩ or higher |
| Q24-16 (REL2) or I35-2 (RLS2) - Body ground | Always | 10 kΩ or higher |
| I35-16 (GND1) - Body ground | Always | Below 5 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK DTC |
(a) Clear the DTCs.
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(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Perform a release operation with the electric parking brake switch (integration control and panel assembly).
HINT:
When the electric parking brake switch (integration control and panel assembly) is pushed and held for 1 second or more without being pushed fully to the release side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).
(e) Check for DTCs.
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| DTC is output | | REPLACE PARKING BRAKE ECU ASSEMBLY |
| DTC is not output | | USE SIMULATION METHOD TO CHECK |
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