Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Switch Failure (B2342)
DESCRIPTION
This DTC is stored when the sliding roof ECU (sliding roof drive gear sub-assembly) detects that the sliding roof switch (map light assembly) is stuck for 30 seconds or more.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B2342 | Switch Failure | Sliding roof ECU (sliding roof drive gear sub-assembly) detects sliding roof switch (map light assembly) is stuck for 30 seconds or more |
|
WIRING DIAGRAM
Refer to DTC B2341.
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CAUTION / NOTICE / HINT
NOTICE:
-
If the sliding roof ECU (sliding roof drive gear sub-assembly) is removed and reinstalled or replaced, the sliding roof ECU (sliding roof drive gear sub-assembly) must be initialized.
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-
The sliding roof system uses the LIN communication system. First, confirm that there are no malfunctions in the LIN communication system. Refer to How to Proceed with Troubleshooting.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Sliding Roof / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Sliding Roof > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Open Switch Failure(Past) | Open switch failure signal (Past) | OFF or ON | OFF: No sliding roof open switch failure signal (Past) ON: Sliding roof open switch failure signal (Past) | - |
| Close Switch Failure(Past) | Close switch failure signal (Past) | OFF or ON | OFF: No sliding roof close switch failure signal (Past) ON: Sliding roof close switch failure signal (Past) | - |
| Up Switch Failure(Past) | Up switch failure signal (Past) | OFF or ON | OFF: No sliding roof tilt up switch failure signal (Past) ON: Sliding roof tilt up switch failure signal (Past) | - |
| Down Switch Failure(Past) | Down switch failure signal (Past) | OFF or ON | OFF: No sliding roof tilt down switch failure signal (Past) ON: Sliding roof tilt down switch failure signal (Past) | - |
| Open Switch Failure(Current) | Open switch failure signal (Current) | OFF or ON | OFF: No sliding roof open switch failure signal (Current) ON: Sliding roof open switch failure signal (Current) | - |
| Close Switch Failure(Current) | Close switch failure signal (Current) | OFF or ON | OFF: No sliding roof close switch failure signal (Current) ON: Sliding roof close switch failure signal (Current) | - |
| Up Switch Failure(Current) | Up switch failure signal (Current) | OFF or ON | OFF: No sliding roof tilt up switch failure signal (Current) ON: Sliding roof tilt up switch failure signal (Current) | - |
| Down Switch Failure(Current) | Down switch failure signal (Current) | OFF or ON | OFF: No sliding roof tilt down switch failure signal (Current) ON: Sliding roof tilt down switch failure signal (Current) | - |
| Tester Display |
|---|
| Open Switch Failure(Past) |
| Close Switch Failure(Past) |
| Up Switch Failure(Past) |
| Down Switch Failure(Past) |
| Open Switch Failure(Current) |
| Close Switch Failure(Current) |
| Up Switch Failure(Current) |
| Down Switch Failure(Current) |
OK:
OFF is displayed for each Data List item.
| OK | .gif) | REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) |
|
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| 2. | CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - BODY GROUND) |
(a) Disconnect the U2 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
(b) Disconnect the U11 sliding roof switch (map light assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| U2-10 (OPN) - Body ground | Always | 10 kΩ or higher |
| U2-8 (CLS) - Body ground | Always | 10 kΩ or higher |
| U2-5 (OPN) - Body ground | Always | 10 kΩ or higher |
| U2-9 (CLS) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY) |
(a) Remove the sliding roof switch (map light assembly).
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(b) Inspect the sliding roof switch (map light assembly).
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| OK | | REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) |
| NG | | REPLACE SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY) |
Sensor (Motor) Failure (B2341,B2344)
DESCRIPTION When the sliding roof ECU (sliding roof drive gear sub-assembly) detects a motor malfunction and the sliding roof operation is stopped, DTC B2341 is stored. When the sliding roof ECU (slid ...
Position Initialization Incomplete (B2343)
DESCRIPTION This DTC is stored when the sliding roof ECU (sliding roof drive gear sub-assembly) has not been initialized. DTC No. Detection Item DTC Detection Condition Trouble Area B2343 ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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