72-25Fault code 21 · Pot. mirror right horizontal - short circuit

911 Turbo (996) Seat memory S02; S03; 72 72-25Fault code 21 Pot. mirror right horizontal - short circuit Diagnostic conditions • Ignition on • Switch for memory seat adjustment actuated Possible cause of fault ♦Short circuit in supply lead to pot. for right rearview mirror ♦Potentiometer faulty ♦Control module faulty Affected terminals Plug 7, terminals 4, 5 and 6 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check 5 V supply voltage ♦Switch off ignition. Approx. 5 V Step 4 of 'carrier with gear unit' Step 2 ♦Pull off plug on 'carrier with gear unit'. ♦Switch on ignition. ♦Measure voltage between pin 3 and ground. 2 Check ground lead of ♦Measure voltage between pins Approx. 5 V Step 7 'carrier with gear unit' 3 and 7 on plug of 'carrier with Step 3 gear unit'. 3 Check signal lead of 'car- ♦Select 'Voltage of right horizon- Approx. 5 V Step 8 rier with gear unit' tal mirror potentiometer' in the Step 11 Actual values menu item. ♦Connect jumper between pins 3 and 5. 4 Check 5 V supply line for ♦Switch off ignition. ∞ Ω Repair wiring har- short circuit to ground Step 5 ness. ♦Pull off mirror plug on control → End module. ♦Measure resistance between plug on carrier pin 3 and ground. ♦Measure resistance between plug on carrier pin 3 and pin 7. 7298 Fault code 21 72-25 page 1 Printed in Germany – 42, 2003 21xxxs02