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Fault code 0968: 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 right bulbs: Bulbs OK.
Go to Step 2		 Bulbs not OK.
Replace bulb(s).
→ End
2 Check open circuit in rear right bulb carrier:
  • Switch off the ignition.
  • Remove plug from rear right bulb carrier.
  • Measure resistance at the bulb carrier between 'Pin 1' and 'Pin 2'.
 approx. 7 Ω
Go to Step 3		 Replace bulb carrier.
→ End
3 Check open circuit in front right bulb carrier:
  • Remove plug from front right bulb carrier.
  • Measure resistance at the bulb carrier between 'Pin 2' and 'Pin 10'.
 approx. 30 Ω
Go to Step 4		 Replace bulb carrier.
→ End
4 Check lines for short circuit to B+:
  • Switch off the ignition.
  • Measure voltage between vehicle electric system plug 'E' 'Pin 1' and ground.
 < 0.3 V
Go to Step 5		 Repair / replace wiring harness
→ End
5 Check lines for short circuit to ground:
  • Switch off the ignition.
  • Measure resistance between vehicle electric system plug 'E' 'Pin 1' and ground.
 ∞ Ω
Go to Step 6		 Repair / replace wiring harness
→ End
6 Check lines for open circuit:
  • Measure resistance between vehicle electric system plug 'E' 'Pin 1' and:
  • Rear left lamp carrier plug 'Pin A 1'
  • (Halogen headlights) front left lamp carrier plug 'Pin A 9'
  • (Xenon headlights) measure front left lamp carrier plug 'Pin A2'
 < 5 Ω
Go to Step 7		 Repair / replace wiring harness
→ End
7 Check short circuit to ground line B+:
  • Switch off the ignition.
  • Remove plug from front right main headlight.
  • Remove plug from right tail light.
  • Switch on ignition.
  • Measure voltage between body ground and front right main headlight plug 'Pin 10'.
  • Measure voltage between body ground and rear right tail light plug 'Pin 2'.
 Go to Step 8 Repair /replace wiring harness
→ End
8 Check ground line for open circuit:
  • Switch off the ignition.
  • Measure resistance between body ground and front right main headlight plug 'Pin 10'.
  • Measure resistance between body ground and rear right tail light plug 'Pin 2'.
 Go to Step 9 Repair /replace wiring harness
→ End
9 Replace vehicle electrical system control module
  • Observe note
 → End
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