Fault code 01206, battery draining, AC not working

[Tomppa]

A4 b6 2003 1,9tdi AVF

After last winter, the AC stopped working. I'm getting fault code 01206 - Signal for Duration of Ignition Off Time. Car battery is draining from full to empty in about 4 days if not used. Any thoughts where the problem might be?

[JohnelP]

Disconnect the battery, put a multimeter on the (+) and (-) cables you disconnected and check for resistor output. Do not have the battery connected when measuring resistance. Or use amps mode if you want to use the battery and more reliable measurements. Start plugging off fuses one by one, until you find which circuit draws the current. Find the culprit circuit, and go from there.

[JuanBrolo84]

A4 b6 2003 1,9tdi AVF

After last winter, the AC stopped working. I'm getting fault code 01206 - Signal for Duration of Ignition Off Time. Car battery is draining from full to empty in about 4 days if not used. Any thoughts where the problem might be?

Check and see if the relays under the ECU are wet.

Sent from my LE2117 using Audizine Forum mobile app

[maurizio]

measure voltage drop across fuses

[Turbo510]

measure voltage drop across fuses

Someone check my math please: Fully-charged H7 battery capacity is say 60 Amp-Hours. Four days to drain battery is about 100 Hours. So average drain current is about 0.6 Amps, similar to the draw of a trunk light being on. From the Littlefuse spec sheet, a 30A fuse has a cold resistance of about 2 milli-Ohm. So the Voltage that you would be trying to check for with your DMM would be 0.6A X .002 Ohms: About 1 mV.

[EuroxS4]

Check ebox under the hood for water intrusion or check J393 in the drivers floor under carpet for water intrusion.