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
If the roof lid glass position is out of the specified range, ETACS-ECU will set the diagnostic trouble code No. L0637.

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.
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.