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Fault code 25: 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 25)

Work instruction Display OK If not OK
1 Check fuse.
  • Check fuse E 1.
 Step 2 Replace fuse E 1.
-> End
2 Check wire from ignition lock to fuse carrier for open circuit.
  • Switch off the ignition.
  • Pull off fuse E 1.
  • Switch on ignition.
  • Measure voltage between fuse carrier (fuse E 1) pin 1 and ground.
 > 11 V
Step 3		 Step 5
3 Check wire from the fuse carrier to the alarm system control module for open circuit.
  • Switch off the ignition.
  • Pull plug A off the alarm system control module.
  • Switch on ignition.
  • Measure voltage between plug A on control module pin 16 and ground.
 > 11 V
Step 7		 Step 4
4 Check wire from the fuse carrier to the alarm system control module for open circuit.
  • Switch off the ignition.
  • Measure resistance between plug A on alarm system control module pin 16 and fuse E 1 pin 2.
 < 5
Step 6		 Repair wiring harness.
-> End
5 Check wire from ignition lock to fuse carrier for open circuit.
  • Switch off the ignition.
  • Pull plug off the ignition lock.
  • Measure resistance between plug on ignition lock pin 86 S and fuse carrier (fuse E 1) pin 1.
 < 5
Step 6		 Repair wiring harness.
-> End
6
  • Replace ignition lock.
 -> End
7
  • Replace alarm system control module.
 -> End
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