Work instruction Display OK If not OK · 6 Check 5 V supply lead ♦R

911 Turbo (996) Air conditioning H01, H02 80 Work instruction Display OK If not OK 6 Check 5 V supply lead ♦Remove plug B from the air- 0 V Repair wiring har- for short to B+ conditioning system regulator ⇒ Step 7 ness → End ♦Switch on ignition ♦Measure voltage at plug B of the air-conditioning system reg- ulator between pin 20 and ground 7 Check 5 V supply line for ♦Measure resistance at plug B ∞ Ω Repair wiring har- short to ground of the air-conditioning system ⇒ Step 8 ness regulator between pin 20 and → End ground 8 Check 5 V supply line ♦Measure resistance between < 5Ω Repair wiring har- and ground line for open plug B on the air-conditioning ⇒ Step 9 ness circuit system regulator pin 20 and → End plug on central flap pin 3 ♦Measure resistance between plug B on the air-conditioning system regulator pin 9 and plug on central flap pin 1 9 Check ground line for ♦Measure resistance between < 5Ω Repair wiring har- open circuit plug of air-conditioning system ⇒ Step 11 ness regulator Pin B9 and plug of → End central flap pin 3 10 ♦Servo motor for central flap → End 11 ♦Replace air-conditioning system regulator → End 8001 Fault code 27 80-13 page 3 Printed in Germany – 15, 2001 27xxxh02