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Home >> Saab >> 2011 >> 9-5 Turbo6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Driver Information, Main Instrument Unit And SID >> Fault diagnosis, symptoms >> Head Up Display Malfunction >> Circuit/System Testing >> Head-up Display Inoperative

Head-up Display Inoperative

  1. Perform Info Display Pattern 1 Check test with the scan tool, verify all pixels on Head-up display are turned On or Off.
  2. If not within the specified range, replace the P29 Head-Up Display.
  3. Ignition OFF, disconnect the harness connector at the P29 Head-Up Display.
  4. Ignition OFF, test for less than 5 Ω between the Head-up display ground circuit terminal 6 and ground.
  5. If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify a test lamp illuminates when connected between the B+ circuit terminal 4 and ground.
  7. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  8. Test for less than 0.3 V between the dimming signal terminal 1 and ground.
  9. If greater than the specified range, test the dimming signal circuit and the signal circuit terminal 3 and the low reference circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the S27 Head-Up Display Switch.
  10. Ignition OFF, switch the Head-up display dimming switch to minimum position (OFF). Test for 25-40 Ω between the dimming signal circuit terminal 1 and the low reference circuit terminal 2.
  11. If less than the specified range, test the dimming signal circuit for a short to ground. If the circuit tests normal, replace the S27 Head-Up Display Switch.
  12. If greater than the specified range, test the dimming signal circuit and the low reference circuit for an open/high resistance. If the circuit tests normal, replace the S27 Head-Up Display Switch.
  13. Switch the Head-up display dimming switch to maximum position. Test for 875-950 Ω between the dimming signal circuit terminal 1 and the low reference circuit terminal 2.
  14. If not in the specified range, replace the S27 Head-Up Display Switch.
  15. If all circuits test normal, test or replace the P29 Head-Up Display.
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