S4 V8-4.2L (BHF) (2004)
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Disconnect electrical connection - A - from Fresh Air Blower Control Module J126.
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Measure voltage between terminal - 6 - and terminal - 3 - on connector - A -.
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Specified value: 8 - 12 V = (depending on intensity of the solar radiation)
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Connect a test lamp (12 V with maximum 5 W) between terminals - 6 - and - 3 - on connector-A-.
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The test lamp should glow or light up (depending on intensity of the solar radiation).
NOTE:
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If test lamp glows or lights up, solar roof function is OK. If Fresh Air Blower V2 does not run, check that Fresh Air Blower V2 moves freely;
if no malfunction can be detected, replace Fresh Air Blower Control Module J126 with Fresh Air Blower V2.
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If test lamp does not glow or light up, check wire connection to both terminals at sunroof cut-out. If no malfunction can be detected, check the
solar panel.
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Only an energy of 1.5 W is supplied when shining halogen lamps on the solar sunroof ( Fresh Air Blower V2 turns, but air flow is difficult to
detect).