Checking operation of solar roof: Audi A6 C6

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

• Special tools named: VAS 5051

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• Check the setting on the MMI (Multi Media Interface). The "“Solar mode”" function must have been set (different versions) Owner's manual and Operating instructions for "“Infotainment / MMI”".

📋 Procedure

1. Move vehicle into the sun. [Note: If weather conditions are not suitable, shine two commercially available 1000 W halogen lamps for example onto the solar roof, maintaining a distance of at least 500 mm from the solar roof. To enable the solar cells C20 to supply sufficient electrical energy to drive the fresh air blower V2, it must be ensured that all sun roof solar cells C20 are evenly and fully illuminated.Electrical energy supplied is only approx. 1.5 W on shining halogen lamps onto solar roof (fresh-air blower V2 rotates but air flow is hardly perceptible).]
2. Open "“centre”" dash panel vents and close all other vents.
3. Check the adaption of the operating and display unit, Climatronic control unit J255 (adaption for the "“Sun roof with solar cells”" function must have been performed) "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
4. Check the setting on the MMI (Multi Media Interface). The "“Solar mode”" function must have been set (different versions) Owner's manual and Operating instructions for "“Infotainment / MMI”".
5. Close sun roof.

6. Switch off ignition (operating and display unit, Climatronic control unit J255 blank).
7. Interrogate fault memory of operating and display unit, Climatronic control unit J255"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
8. Check encoding and adaption of operating and display unit, Climatronic control unit J255"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. [Note: The current supplied by the sun roof with solar cells C20 to the fresh air blower V2 can be read out, depending on the version of the operating and display unit, Climatronic control unit J255, in the measured value block. Position the vehicle with the sun roof closed in the sun for example (or under two lamps as described above) and then select the corresponding measured value block of the operating and display unit, Climatronic control unit J255"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. After switching off the ignition, the display shows the current supplied by the sun roof with solar cells C20 on switching off the ignition (and for a short time afterwards).]
9. Switch off ignition.
10. Remove plenum chamber cover.
11. ⚠ The two valves of the pump valve unit may be hot even if the engine is cold. — Open 3–pin connector (A) of vehicle wiring harness to air intake unit (to fresh-air blower control unit J126).
12. Measure voltage at connector (B) between contact (2) (of solar roof) and contact (3) (earth) .
13. Connect up test lamp (12 V, max. 5 W) between contacts (2) and (3) at connector (B).
14. Test lamp glows or lights (depending on sunlight intensity). [Note: Solar roof function is OK if test lamp glows or lights. If fresh-air blower V2 does not run, check freedom of movement of fresh-air blower V2 and actuation of fresh-air blower control unit J126 by operating and display unit, Climatronic control unit J255. Replace fresh-air blower control unit J126 if no fault is found.If test lamp does not glow or light, check wiring to the two contacts (B) at the sun roof opening. If no fault is found, check solar panel and General body repairs, exterior60.Electrical energy supplied is only approx. 1.5 W on shining halogen lamps onto solar roof (fresh-air blower V2 rotates but air flow is hardly perceptible).]

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