New Sunroof Drive Motor

New Sunroof Drive Motor

Vehicle Type: 911 Carrera (996), 911 Carrera 4 (996), with option M 650

Model Year: As of 1999 (X)

Concern: Rumbling noises when driving between 30-37 mph (50-60 kmh) with sunroof is open.

Information: As of February 1, 1999, and VIN: 99 XXS 62 5423, a new tilting/sliding roof drive assembly with enhanced circuitry is installed in production. The new drive assembly has optimized final-position settings that result in lower noise levels.

Open Position Enhancement
The stopping point of the sliding roof panel when opened is approx. 12-mm forward of the former drive assembly stopping point. This results in a dramatic reduction of "rumbling" noises that can occur when the sunroof is fully opened (while traveling at the speeds above).

Closed Position Enhancement
When closing the sliding roof from the tilted position, the sliding roof panel lowers slightly below roof level for a brief moment, then moves upward to its final end position. This allows for a more precise height adjustment of the sliding roof panel. Wind noises are therefore avoided when the sliding roof is closed.

When addressing complaints of "rumbling while driving when the sliding roof is open", vehicles produced prior to the above production change can be retrofitted with the new tilting/sliding roof drive assembly.

Parts Info.:

Part Number Description
996 624 211 02 New tilting/sliding roof drive assy.
999 073 135 07 Oval-head screws M5x25 (2 ea.), always replace
996 624 211 01 Former tilting/sliding roof drive assy., no longer available

Work Procedure: Refer to the 911 Carrera (996) Technical Manual, Volume 6, to perform drive assembly replacement. After installation of the new drive assembly, perform the following:

- Calibrate (teach) the new tilting/sliding roof drive (motor).
- Check the height of the sliding roof panel and adjust if necessary.

Inform your customer that to realize the full benefit of new optimized sliding roof assembly, it is best to use the one-touch opening feature of the sliding roof (see Owner's Manual). Using this feature will automatically open the roof to its optimal low-noise end position.

Literature: 911 Carrera (996) Technical Manual, Group 6, sections:
60 14 19 - Removing and installing tilting/sliding roof drive (motor).
60 14 15 - Re-teaching the lifting/sliding roof drive (motor).
60 40 19 - No.2, Adjusting sliding roof panel.
911 Carrera (996) Owner's Manual - Tilting/sliding roof.

Important Notice: Porsche Cars N.A Technical Bulletins are intended for use by professional technicians, not a "Do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Special tools may be required to perform certain operations identified in these bulletins. Use of tools and procedures other than those recommended in these bulletins may be detrimental to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your Porsche Dealer for information on whether your vehicle may benefit from the information. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part numbers.