Lexus ES: Sensor (Motor) Failure (B2341,B2344)
DESCRIPTION
When the sliding roof ECU (sliding roof drive gear assembly) detects a motor malfunction and the sliding roof operation is stopped, DTC B2341 is stored.
When the sliding roof ECU (sliding roof drive gear assembly) 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 ECU (sliding roof drive gear assembly) enters fail-safe mode due to a problem with the motor) |
|
| B2344 | Position Failure | Position failure (When the sliding roof ECU (sliding roof drive gear assembly) enters fail-safe mode due to a problem with the gear position) |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
If the sliding roof ECU (sliding roof drive gear assembly) is removed and reinstalled or replaced, the sliding roof ECU (sliding roof drive gear assembly) must be initialized.
Click here
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- DTCs B2341 and B2344 are stored in the sliding roof ECU (sliding roof drive gear assembly).
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
Body Electrical > Sliding Roof > Clear DTCs(b) Check for DTCs.
Body Electrical > Sliding Roof > Trouble CodesOK:
DTCs B2341 and B2344 are not output.
| OK | .gif) | USE SIMULATION METHOD TO CHECK |
|
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| 2. | CHECK SLIDING ROOF OPERATION |
(a) Check the sliding roof auto operation function.
Click here
OK:
Auto operation function operates normally.
| NG | | GO TO STEP 4 |
|
| 3. | CHECK DTC OUTPUT |
(a) Clear the DTCs.
Body Electrical > Sliding Roof > Clear DTCs(b) Check for DTCs.
Body Electrical > Sliding Roof > Trouble CodesOK:
DTCs B2341 and B2344 are not output.
| OK | | USE SIMULATION METHOD TO CHECK |
| NG | | REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) |
| 4. | INITIALIZE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) |
(a) Check that the sliding roof ECU (sliding roof drive gear assembly) can be initialized.
Click here
OK:
Sliding roof ECU (sliding roof drive gear assembly) can be initialized.
| NG | | GO TO STEP 6 |
|
| 5. | CHECK DTC OUTPUT |
(a) Clear the DTCs.
Body Electrical > Sliding Roof > Clear DTCs(b) Check for DTCs.
Body Electrical > Sliding Roof > Trouble CodesOK:
DTCs B2341 and B2344 are not output.
| OK | | END (MALFUNCTION DUE TO INITIALIZATION FAILURE) |
| NG | | REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) |
| 6. | CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) - PANORAMIC MOON ROOF SWITCH (MAP LIGHT SUB-ASSEMBLY) AND BODY GROUND) |
(a) Disconnect the Q1 sliding roof ECU (sliding roof drive gear assembly) connector.
(b) Disconnect the P13 panoramic moon roof switch (map light sub-assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Q1-8 (CLS) - P13-12 (CLS) | Always | Below 1 Ω |
| Q1-8 (CLS) or P13-12 (CLS) - Body ground | Always | 10 kΩ or higher |
| Q1-10 (OPN) - P13-11 (OPN) | Always | Below 1 Ω |
| Q1-10 (OPN) or P13-11 (OPN) - Body ground | Always | 10 kΩ or higher |
| Q1-4 (TILT) - P13-7 (B) | Always | Below 1 Ω |
| Q1-4 (TILT) or P13-7 (B) - Body ground | Always | 10 kΩ or higher |
| Q1-5 (OPN) - P13-23 (UP) | Always | Below 1 Ω |
| Q1-5 (OPN) or P13-23 (UP) - Body ground | Always | 10 kΩ or higher |
| Q1-9 (CLS) - P13-24 (DOWN) | Always | Below 1 Ω |
| Q1-9 (CLS) or P13-24 (DOWN) - Body ground | Always | 10 kΩ or higher |
| Q1-2 (E) - Body ground | Always | Below 1 Ω |
| P13-19 (GND) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | INSPECT PANORAMIC MOON ROOF SWITCH (MAP LIGHT SUB-ASSEMBLY) |
(a) Remove the panoramic moon roof switch (map light sub-assembly).
Click here
(b) Inspect the panoramic moon roof switch (map light sub-assembly).
Click here
| OK | | REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) |
| NG | | REPLACE PANORAMIC MOON ROOF SWITCH (MAP LIGHT SUB-ASSEMBLY) |
READ NEXT:
Switch Failure (B2342)
DESCRIPTION This DTC is stored when the sliding roof ECU (sliding roof drive gear assembly) detects that the panoramic moon roof switch (map light sub-assembly) is stuck for 30 seconds or more. DTC
Position Initialization Incomplete (B2343)
DESCRIPTION This DTC is stored when the sliding roof ECU (sliding roof drive gear assembly) has not been initialized. DTC No. Detection Item DTC Detection Condition Trouble Area B2343 P
Motor Control Relay Stuck ON (B2345)
DESCRIPTION This DTC will be stored if the operation of the sliding roof is suspended and a pulse input of 10 Hz or more is detected when the motor relay is off. DTC No. Detection Item DTC Dete
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Diagnostic Trouble Code Chart
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Main Body ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Main Body ECU Communication Stop Mode Any of the following conditions are met:
Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "M
