L0637

Code No. L0637 S/R Position

CAUTION: Before replacing the ECU, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

Current trouble
- If the roof lid glass position is out of the specified area, sunroof ECU sets the diagnostic trouble code No. L0637.

Past trouble
- If the diagnostic trouble code No. L0637 is set as past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus communication line. For diagnosis procedures, refer to How to treat past trouble (Refer to Controller Area Network, How to Use Troubleshooting/Inspection Service Points).

NOTE: For a past trouble, you cannot find it by the scan tool (M.U.T.-III) CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to Controller Area Network, How to Use Troubleshooting/Inspection Service Points and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the diagnostic trouble code, which is set regarding the CAN communication-linked ECUs (Refer to Controller Area Network, CAN Bus Line Diagnostic Flow).

PROBABLE CAUSES
- Malfunction of the sunroof motor assembly

DIAGNOSTIC PROCEDURE

STEP 1. Check the sunroof fully closed position
1. Carry out the learning procedures of the sunroof fully closed position. Shifting Conditions For the Fully Closed Position Adjustment Mode
2. Recheck if the diagnostic trouble code is set.
a. Erase the diagnostic trouble code.
b. Turn the ignition switch from the LOCK (OFF) position to the ON position.
c. Check if the diagnostic trouble code is set.

Q: Is the check result normal?

YES : The procedure is complete.

NO : Go to Step 2.

STEP 2. Diagnostic trouble code recheck
Recheck if the diagnostic trouble code is set.

1. Erase the diagnostic trouble code.
2. Turn the ignition switch from the LOCK (OFF) position to the ON position.
3. Check if the diagnostic trouble code is set.

Q: Is the diagnostic trouble code set?

YES : Replace the sunroof motor assembly.

NO : The procedure is complete.