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Fault code 1704: Diagnosis/troubleshooting

NOTE:
  • Before replacing the control module, the ground connections, power supply and plug connections on the control module must be checked.
  • When replacing the vehicle electrical system control module, observe the coding of the control module.
  • After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again. Additional causes of faults that could damage the vehicle electrical system control module should be detected and remedied.
DIAGNOSIS/TROUBLESHOOTING CHART

Work instruction Display OK If not OK
1 Check interior light fuse:
  • Check fuse 'F 12' in the fuse carrier on the left.
 Fuse OK
Go to Step 3		 Fuse not OK replace fuse.
→ End
If fuse is faulty again, then:
Go to Step 2
2 Check lines for short circuit to B+:
  • Switch off the ignition.
  • Pull out plug 'J' on vehicle electrical system control module.
  • Remove plug from left instrument panel dimmer.
  • Switch on ignition.
  • Measure voltage between vehicle electric system plug 'J' 'Pin 1, 2' and ground.
 < 0.3 V
Go to Step 3		 Repair / replace wiring harness
→ End
3 Check lines for short circuit to ground:
  • Switch off the ignition.
  • Measure resistance between vehicle electric system plug 'J' 'Pin 1, 2' and ground.
 ∞ Ω
Go to Step 4		 Repair / replace wiring harness
→ End
4 Check KI 58d dimmer line for open circuit:
  • With halogen headlights:
  • Measure resistance between vehicle electric system plug 'J' 'Pin 1' and LWR dimmer plug 'Pin 3' as well as instrument dimmer plug 'Pin 2'.
  • With xenon headlights:
  • Measure resistance between vehicle electric system plug 'J' 'Pin 1' and instrument dimmer plug 'Pin 2'.
 < 5 Ω
Go to Step 5		 Repair / replace wiring harness
→ End
5 Check KI.58d out. line for open circuit:
  • With halogen headlights:
  • Measure resistance between vehicle electric system plug 'J' 'Pin 2' and LWR dimmer plug 'Pin 1' as well as instrument dimmer plug 'Pin 1'.
  • With xenon headlights:
  • Measure resistance between vehicle electric system plug 'J' 'Pin 2' and instrument dimmer plug 'Pin 1'.
 < 5 Ω
Go to Step 6		 Repair / replace wiring harness
→ End
6 Replace potentiometer on a trial basis.
  • Erase fault memory.
  • Satisfy diagnostic conditions
  • Read out fault memory again
 Fault code 1704 not entered.
→ End		 Fault code 1704 re-entered.
Go to Step 7
7 Replace vehicle electrical system control module
  • Observe note
 → End
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