80-11Fault code 25 · Supply voltage (5 V) - too high/ too low

911 Turbo (996) Air conditioning H01, H02 80 80-11Fault code 25 Supply voltage (5 V) - too high/ too low Diagnostic conditions • Ignition on Note! No control module fault stored Possible cause of fault ♦Short circuit to voltage/ground or open circuit in the wiring between the air-conditioning system regulator and the four flap motors. ♦Air-conditioning system regulator faulty Affected terminals Plug B, terminals 9 and 20 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check 5 V supply lead for ♦Switch off ignition 0 V Repair wiring har- short to B+ ⇒ Step 2 ness→ End ♦Remove plug B from the air-con- ditioning system regulator ♦Switch on ignition ♦Measure voltage at plug B of the air-conditioning system regula- tor between pin 20 and ground 2 Check 5 V - supply line ♦Switch off ignition approx. 5 V If more than 5.5 V is ⇒ Step 4 indicated: ♦Replace plug B on the air-condi- ⇒ Step 8 tioning system regulator If 0 V is indicated: ♦Remove connector for tempera- ⇒ Step 3 ture mixing valve ♦Switch on ignition ♦Measure voltage at plug of the flap motor between pin 3 and ground 8001 Fault code 25 80-11 page 1 Printed in Germany – 15, 2001 25xxxh02