Lexus NX: Sensor (Motor) Failure (B2341,B2344)
DESCRIPTION
When the sliding roof drive gear sub-assembly (sliding roof ECU) detects a motor malfunction and the sliding roof operation is stopped, DTC B2341 is stored.
When the sliding roof drive gear sub-assembly (sliding roof ECU) detects a gear position malfunction and the sliding roof operation is stopped, DTC B2344 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B2341 | Sensor (Motor) Failure | Sensor (motor) failure (When the sliding roof drive gear sub-assembly (sliding roof ECU) enters fail-safe mode due to a problem with the motor) |
|
| B2344 | Position Failure | Position failure (When the sliding roof drive gear sub-assembly (sliding roof ECU) enters fail-safe mode due to a problem with the gear position) |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
If the sliding roof drive gear sub-assembly (sliding roof ECU) is replaced, the sliding roof drive gear sub-assembly (sliding roof ECU) 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. | CHECK SLIDING ROOF OPERATION |
(a) Check the sliding roof auto operation.
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OK:
Auto operation operates normally.
| NG | .gif) | GO TO STEP 3 |
|
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| 2. | CHECK DTC OUTPUT |
(a) Clear the DTCs.
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(b) Check for DTCs.
Click here
OK:
DTCs B2341 and B2344 are not output.
| OK | | USE SIMULATION METHOD TO CHECK |
| NG | | REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
| 3. | INITIALIZE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
(a) Check that the sliding roof drive gear sub-assembly (sliding roof ECU) can be initialized.
Click here
OK:
Sliding roof drive gear sub-assembly (sliding roof ECU) can be initialized.
| NG | | GO TO STEP 5 |
|
| 4. | CHECK DTC OUTPUT |
(a) Clear the DTCs.
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(b) Check for DTCs.
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OK:
DTCs B2341 and B2344 are not output.
| OK | | END (MALFUNCTION DUE TO INITIALIZATION FAILURE) |
| NG | | REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
| 5. | PERFORM ACTIVE TEST USING TECHSTREAM (Slide Roof) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Sliding Roof / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Sliding Roof > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Slide Roof | Operate sliding roof motor | OFF / Opn/Dwn / Clos/Up | - |
| Tester Display |
|---|
| Slide Roof |
OK:
Slide roof is operated using Techstream.
| NG | | REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
|
| 6. | READ VALUE USING TECHSTREAM (Open Switch, Close Switch, Up Switch, Down Switch) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power 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 | OPEN switch signal | OFF or ON | OFF: OPEN switch not pressed ON: OPEN switch pressed | - |
| Close Switch | CLOSE switch signal | OFF or ON | OFF: CLOSE switch not pressed ON: CLOSE switch pressed | - |
| Up Switch | UP switch signal | OFF or ON | OFF: UP switch not pressed ON: UP switch pressed | - |
| Down Switch | DOWN switch signal | OFF or ON | OFF: DOWN switch not pressed ON: DOWN switch pressed | - |
| Tester Display |
|---|
| Open Switch |
| Close Switch |
| Up Switch |
| Down Switch |
OK:
The Techstream display changes according to switch operation as shown in the table.
| OK | | REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
|
| 7. | INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light assembly (slide roof switch).
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(b) Inspect the map light assembly (slide roof switch).
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| NG | | REPLACE MAP LIGHT ASSEMBLY |
|
| 8. | CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY - MAP LIGHT ASSEMBLY AND BODY GROUND) |
(a) Disconnect the T9 sliding roof drive gear sub-assembly connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| T9-4 (UP) - T6-23 (UP) | Always | Below 1 Ω |
| T9-4 (UP) or T6-23 (UP) - Body ground | Always | 10 kΩ or higher |
| T9-5 (CLS) - T6-12 (CLS) | Always | Below 1 Ω |
| T9-5 (CLS) or T6-12 (CLS) - Body ground | Always | 10 kΩ or higher |
| T9-6 (DWN) - T6-24 (DOWN) | Always | Below 1 Ω |
| T9-6 (DWN) or T6-24 (DOWN) - Body ground | Always | 10 kΩ or higher |
| T9-7 (OPN) - T6-11 (OPN) | Always | Below 1 Ω |
| T9-7 (OPN) or T6-11 (OPN) - Body ground | Always | 10 kΩ or higher |
| T9-12 (E) - Body ground | Always | Below 1 Ω |
| T6-19 (GND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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