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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 B2740: Front Fog Lamp Switch Circuit Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
  2. Ignition ON, test for greater than 10V between the 12 V reference circuit terminal 1 and ground.
  3. If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. Test for 0.4K Ω to 1K Ω between the signal circuit terminal 12 and ground.
  5. 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 K9 BCM.
  6. If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
  7. If all circuits test normal, test or replace the S30 headlamp switch.
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