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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, fault codes >> DTC B3634: Head-Up Display Dimming Switch Circuit Short to Ground >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the S27 Head-Up Display Switch.
  2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.
  3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K78 Head-Up Display Module.
  4. Ignition ON, verify the scan tool Dim Select Switch parameter is 12.
  5. If less than the specified range, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K78 Head-Up Display Module.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 1. Verify the scan tool Dim Select Switch parameter is 1.
  7. If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K78 Head-Up Display Module.
  8. If all circuits test normal, test or replace the S27 Head-Up Display Switch.
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