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Fault code 42: Diagnosis/troubleshooting

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 42)

Work instruction Display OK If not OK
1 Check transponder.
  • Check whether the transponder is present and undamaged in the hand-held transmitter.
 Step 2 Replace hand-held transmitter.
->End
2 Check teaching functions.
  • Connect the Porsche System Tester II 9588, switch on the ignition and select the alarm system control module.
  • Check whether the transponder has been adapted to the vehicle in the Learning functions menu item.
 Step 3 Re-teach the transponder in the Transponder key menu item.
3 Check control lead between the alarm system control module and the signal converter for short circuit to ground.
  • Switch off ignition.
  • Pull plug A off the alarm system control module.
  • Pull plug off the signal converter.
  • Measure resistance between plug A on control module pin 4 and ground.
 Step 4 Repair wiring harness.
->End
4 Check control lead between the alarm system control module and the signal converter for short circuit to B+.
  • Switch on the ignition.
  • Measure voltage between plug A on alarm system control module pin 4 and ground.
 0 V
Step 5		 Repair wiring harness.
->End
5 Check control lead between the alarm system control module and the signal converter for open circuit.
  • Switch off ignition.
  • Measure resistance between plug A on alarm system control module pin 4 and plug on signal converter pin 6.
 < 5
Step 6		 Repair wiring harness.
->End
6 Check data lead between the alarm system control module and the signal converter for short circuit to ground.
  • Switch off ignition.
  • Pull plug A off the alarm system control module.
  • Pull plug off the signal converter.
  • Measure resistance between plug A on control module pin 3 and ground.
 Step 7 Repair wiring harness.
->End
7 Check data lead between the alarm system control module and the signal converter for short circuit to B+.
  • Switch on the ignition.
  • Measure voltage between plug A on alarm system control module pin 3 and ground.
 0 V
Step 8		 Repair wiring harness.
->End
8 Check data lead between the alarm system control module and the signal converter for open circuit.
  • Switch off ignition.
  • Measure resistance between plug A on alarm system control module pin 3 and plug on signal converter pin 8.
 < 5
Step 9		 Repair wiring harness.
->End
9
  • Replace signal converter.
 ->End
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