91 PCM 2 / CDR 23 911 Turbo (996) · Diagnosis/Troubleshooting BOSE

91 PCM 2 / CDR 23 911 Turbo (996) Diagnosis/Troubleshooting BOSE Work instruction Display OK If not OK 1 Reading out external ♦Connect the Porsche System → End Fault code is still amplifier fault memory Tester II No. 9588 to the diag- displayed. nostic socket; switch on the igni- Step 2 tion and the Porsche System Tester ll No. 9588. ♦Select vehicle type 911 (996) and start the automatic control module search. ♦Select 'PCM2' in the "Control units" menu. ♦Select 'External amplifier' in the PCM2 menu. ♦Select 'Fault memory' in the menu and click the > > key. ♦Read out fault memory. ♦Erase fault memory. ♦Remove ignition key and switch on ignition again. ♦Read out fault memory. ♦Extract ambient data, press the >> key. 2 Checking wiring harness ♦Switch off ignition. = 4 Ω Open circuit in wir- and front right loud- ♦Pull plug A off the amplifier. Step 3 ing/short circuit to speaker ground. Repair ♦Measure resistance on plug A wiring harness. pin 29 and pin 24. Step 4 3 Checking wiring harness ♦Switch off ignition. < 0.5 Ω Step 6 and rear left and right ♦Pull plug A off the amplifier Step 4 loudspeakers ♦Check resistance on plug A pin 23 and pin 28. 4 Checking wiring harness ♦Pull plug off loudspeaker. < 0.5 Ω Repair wiring har- of front right loudspeaker ♦Check resistance of plug A of Step 5 ness. → End amplifier pin 26 to plug on front right door speaker pin 2. 5 Checking wiring harness ♦Pull plug off loudspeaker. < 0.5 Ω Repair wiring har- of front right loudspeaker ♦Check resistance of plug A of Step 8 ness. → End amplifier pin 31 to plug on front right door speaker pin 1. 6 Checking wiring of rear ♦Check resistance of plug A of < 0.5 Ω Open circuit in wir- right and left loudspeak- amplifier pin 23 to plug on rear Step 7 ing/short circuit to ers left and right loudspeakers pin ground. Repair wir- 3. ing harness. → End 91-109 page 2 9101 8004 BOSE external amplifier 8004VBlwl Printed in Germany – 29, 2002