8021 Navigation: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (8020 NAVIGATION)

Work instruction			Display OK	If not OK
1	Antenna wiring to the GPS antenna	Connect the Porsche System Tester II 9588 to the diagnostic socket; switch on the ignition and the Porsche System Tester II 9588 Select vehicle type 911 (996) and start the automatic control unit search In the Control units menu, select PCM2 In the PCM2 menu, select External amplifier Make a selection in the Fault memory menu and start with 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	-> End	Fault code is still displayed Step 2
2	Check antenna wiring to the GPS antenna	Switch off ignition Pull off antenna on the navigation module Check resistance on plug I to GPS antenna plug	<0.5 Step 3	Repair open circuit in wiring -> End
3	Check antenna wiring to the GPS antenna	Switch ignition on. Measure voltage on plug I to ground	< 1 V Step 4	Short circuit to B+; Repair wiring harness -> End
4	Replace GPS antenna		-> End	Step 5
5	Replace navigation module		-> End	Step 6
6	Replace PCM2		-> End	-