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Fault code 39: 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 39)

Work instruction Display OK If not OK
1 Check power supply of the signal converter.
  • Switch off the ignition.
  • Pull plug off the signal converter.
  • Switch on terminal 86 S.
  • Measure voltage between plug on the signal converter pin 5 and ground.
  • Measure voltage between the plug on the signal converter pin 5 and pin 4.
 > 11 V
Step 2		 Repair wiring harness.
2 Check wiring from signal converter to alarm system control module for short circuit to ground.
  • Switch off the ignition.
  • Pull plug A off the alarm system control module.
  • Measure resistance between plug on alarm system pin 3 and ground.
  • Measure resistance between plug on alarm system pin 4 and ground.
 Step 3 Repair wiring harness.
->End
3 Check wiring from signal converter to alarm system control module for short circuit to B+.
  • Switch on ignition.
  • Measure voltage between plug A on control module pin 3 and ground.
  • Measure voltage between plug A on control module pin 4 and ground.
 0 V
Step 4		 Repair wiring harness.
->End
4 Check wiring from signal converter to alarm system control module for open circuit.
  • Switch off the ignition.
  • Measure resistance between plug A on control module pin 3 and plug on signal converter pin 8.
  • Measure resistance between plug A on control module pin 4 and plug on signal converter pin 6.
 < 5
Step 5		 Repair wiring harness.
->End
5
  • Replace signal converter.
 ->End
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