Air conditioning H01, H02 911 Turbo (996)80 · Diagnosis/troubleshooting

Air conditioning H01, H02 911 Turbo (996)80 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check CAN bus leads, ♦Switch off ignition ∞ Ω Repair wiring har- CAN-high and CAN-low for ⇒ Step 2 ness ♦Remove plug A from the instru- short circuit. → End ment cluster ♦Remove plug of the air-condition- ing system regulator ♦Measure resistance on plug A of the instrument cluster between pin 14 and pin 30 2 Check CAN bus lead, ♦Measure resistance between ∞ Ω Repair wiring har- CAN-high for short to plug A on instrument cluster pin ⇒ Step 3 ness ground 14 and ground → End 3 Check CAN bus lead, ♦Switch on ignition 0 V Repair wiring har- CAN-low for short to B+ ⇒ Step 4 ness ♦Measure voltage between plug A → End on instrument cluster pin 30 and ground 4 Determine faulty control ♦Switch off ignition Fault has been reme- The fault is still unit died present ⇒ Step 6 ♦Reattach the plugs on instru- ⇒Step 5 ment cluster ♦ Read out fault memory from instrument cluster and check whether the fault "CAN Comfort Bus" has been remedied. 5 ♦Replace air-conditioning system regulator → End 6 ♦Replace instrument cluster → End 80-19 page 2 8001 Fault code 34 34xxxh02 Printed in Germany – 15, 2001