Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Calibration Function
During calibration, the software of the Sun Roof Module (SRM) detects the sun roof's zero position. The zero position serves as a reference point for the Sun Roof Module (SRM) when the sun roof is operated. This reference point helps the Sun Roof Module (SRM) determine where the main positions of the glass panel should be.
Once calibration is complete, pinch protection is activated. The Sun Roof Module (SRM) then detects if the closing speed of the glass panel decreases, that is to say if something is in the path of the glass panel. Pinch protection is then triggered.
During calibration, glass panel speed is also detected by two light sensors that measure how many revolutions and at what speed the gear wheels of the sun roof motor rotate. The light sensors (1) are located within the sun roof motor. The sun roof motor can handle a drop in voltage down to 9 Volts during calibration and still maintain precision.
If the sun roof stops in the open position when it should be closed, you can pull on the sun roof while holding the switch depressed.
If for some reason the sun roof is blocked and the switch is held in when the sun roof is tiled/open, the Sun Roof Module (SRM) will calibrate its zero position as the position at which the sun roof is blocked. This means that the main positions of the glass panel will be incorrectly programmed.
This problem is remedied by recalibrating the sun roof. First hold the switch pressed in for 5 seconds when in the tiled/open position. Then open the sun roof to the end position and recalibrate.
If the sun roof should seize, there will not be a diagnostic trouble code in the control module.
If the Sun Roof Module (SRM) is not calibrated, the sun roof safety functions (specifically the pinch protection function) and the programmed main positions will not be operational.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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