Lexus NX: Engine Switch/Power Switch Malfunction (C13A2)
DESCRIPTION
When the power switch is turned on (IG), power is supplied to the parking brake ECU assembly. This DTC is stored if the IG power source is not input to the parking brake ECU assembly when communication with other ECUs occurs.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| C13A2 | Engine Switch/Power Switch Malfunction | Both of the 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. | READ VALUE USING TECHSTREAM (IG STATUS / IG SWITCH) |
(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 |
|---|---|---|---|
| IG Status | Power switch information display | ON or OFF | ON: Power switch is on (IG) OFF: Power switch is on (ACC) or off |
| IG Switch | IG power source information display | ON or OFF | ON: IG power source is input into parking brake ECU assembly OFF: IG power source is not input into parking brake ECU assembly |
| Tester Display |
|---|
| IG Status |
| IG Switch |
| NG | .gif) | GO TO STEP 3 |
|
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| 2. | CHECK DTC |
(a) Clear the DTCs.
Click here .gif)
(b) Turn the power switch off.
(c) Check for DTCs.
Click here
| DTC is output | | REPLACE PARKING BRAKE ECU ASSEMBLY |
| DTC is not output | | USE SIMULATION METHOD TO CHECK |
| 3. | CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Turn the power switch off.
(b) Disconnect the Q24 and Q25 parking brake ECU assembly connectors.
(c) Disconnect the 4A instrument panel junction block assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Q24-5 (IG) - 4A-32 | Always | Below 1 Ω |
| Q24-5 (IG) or 4A-32 - Body ground | Always | 10 kΩ or higher |
| Q25-9 (GND1) - Body ground | Always | Below 1 Ω |
| OK | | REPAIR IG POWER SOURCE CIRCUIT |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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