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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 Switch Malfunction

Head-up Display Switch Malfunction

  1. Perform COMPONENT TESTING  before Head-up Display Switch Malfunction.
  2. Ignition OFF, disconnect the harness connector at the S27 Head-Up Display Switch.
  3. Test for less than 5 Ω between the Head-up display switch low reference circuit terminal 1 and ground.
  4. If greater than the specified range, test the Head-up display switch low reference circuit for an open/high resistance. If the circuit tests normal, replace the P29 Head-Up Display.
  5. Ignition ON, verify that all scan tool Head-Up Switch parameter are Undefined.
  6. If any not Undefined, test the Head-up display switch signal circuit for a short to ground. If the circuit tests normal, replace the P29 Head-Up Display.
  7. Ignition ON, install a 604 Ω resistance between the signal circuit's connection 6 for the windshield display's switch and the low reference circuit's connection 1 for the windshield display's switch. Check that the diagnostic tool parameter Sida Switch is Active.
  8. If not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P29 Head-Up Display.
  9. If all circuits test normal, test or replace the P29 Head-Up Display.
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