80-14Fault code 28 · Footwell/defrost flap motor - No reaction to activation,

911 Turbo (996) Air conditioning H01, H02 80 80-14Fault code 28 Footwell/defrost flap motor - No reaction to activation, signal unclear Diagnostic conditions • Ignition on Note! ♦No control module fault stored ♦No fault with supply voltage (5 V) Possible cause of fault ♦Short circuit to voltage/ground or open circuit in the wiring between the air-conditioning system regulator and the footwell/ defrost flap ♦Servo motor for footwell/defrost flap faulty or flap does not open/close smoothly. Affected terminals Plug B, terminals 3, 9 and 20 Plug D, terminals 3 and 11 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Visual inspection ♦Switch off ignition Check the connec- Clean connector or tor for corrosion plug in correctly ♦Remove the plug for the foot- and that it is cor- → End well/defrost flap rectly inserted ⇒ Step 2 2 Check 5 V - supply line to ♦Switch on ignition approx. 5 V ⇒ Step 6 footwell/defrost flap ⇒ Step 3 ♦Measure voltage at plug of the motor footwell/defrost flap motor between pin 3 and ground ♦Measure voltage at plug of the footwell/defrost flap motor between pin 3 and pin 1 8001 Fault code 28 80-14 page 1 Printed in Germany – 15, 2001 28xxxh02