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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 B3650: High Beam Request Signal Circuit Performance >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the S78 Turn Signal/Multifunction Switch harness connector. Test for less than 5 Ω between the ground circuit terminal 3 and ground.
  2. If greater then the specified value, test the ground circuit for an open circuit/high resistance.
  3. Connect the S78 Turn Signal/Multifunction Switch harness connector.
  4. Disconnect the X3 harness connector at the K9 Body Control Module.
  5. Connect a test lamp between B+ and the signal circuit terminal 11 X3.
  6. Push/pull the S78 Turn Signal/Multifunction Switch between the high beam and OFF position. The test lamp should turn ON and OFF as the switch is cycled.
  7. If the test lamp is always OFF, test the signal circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the S78 Turn Signal/Multifunction Switch.
  8. If the test lamp is always ON, test the signal circuit for a short to ground. If the circuit test normal, replace the S78 Turn Signal/Multifunction Switch.
  9. If all circuits test normal, replace the K9 Body Control Module.
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