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Home >> Saab >> 2010 >> 9-5 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Theft Protection >> Fault diagnosis, fault codes >> DTC B0685: Security System Indicator Circuit Short to Ground >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B10B Light/Sunload Ambient Sensor.
  2. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, test for less than 1V between the control circuit terminal 1 and ground.
  5. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  6. Command the security LED ON. Test for B+ between the control circuit terminal 1 and ground.
  7. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  8. If all circuits test normal, replace the B10B Light/Sunload Ambient Sensor.
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