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Home >> Saab >> 2011 >> 9-5 Turbo6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting And Signaling Systems >> Fault diagnosis, fault codes >> DTC B2645: Ambient Light Sensor Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
  2. Test for less than 5 Ω between the ground circuit harness connector terminal 6 and ground.
  3. If greater than the specified range, test the low reference circuit for an open/high resistance.
  4. Ignition ON, test for 4.8-5.2 V between the signal circuit harness connector terminal 5 and ground.
  5. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
  6. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  7. If all circuits test normal, test or replace the B10B Ambient Light/Sunload Sensor.
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