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Circuit/System Verification

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Auto Hdlp. Disable Sw. parameter while cycling the headlamp switch between the Auto and Off positions. The parameter should change between Active and Inactive.
    • If the parameter does not change between the specified values, refer to Circuit/System Testing  for Headlamp Switch Malfunction.
  2. Observe the scan tool Headlamp Switch parameter while cycling the headlamp switch between the Auto and Head position. The parameter should change between Active and Inactive.
    • If the parameter does not change between the specified values, refer to Circuit/System Testing  for Headlamp Switch Malfunction.
  3. With the headlamps ON, observe the scan tool Flash to Pass Switch parameter while pulling and releasing the flash to pass switch. The parameter should change between Active and Inactive.
    • If the parameter does not change between the specified values, refer to Circuit/System Testing  for Turn Signal/Multifunction Malfunction.
  4. With the headlamps ON, observe the scan tool High Beam Select Switch parameter while switching the headlamp dimmer switch between the low and high beam positions. The parameter should change between Active and Inactive.
    • If the parameter does not change between the specified values, refer to Circuit/System Testing  for Turn Signal/Multifunction Malfunction.
  5. Ignition ON, with a test lamp connected to ground, probe each of the test points on either LO BEAM Fuse while commanding the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF at one or both of the fuse test points when changing between commanded states.
    • If the test lamp is always OFF, or remains always ON, refer to Circuit/System Testing  for Low Beam PCB Relay Malfunction.
    • If the test lamp turns ON and OFF, refer to Circuit/System Testing  for Headlamps Malfunction.
  6. Ignition ON, with a test lamp connected to ground, probe each of the test points on either HI BEAM Fuse while commanding the High Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF at one or both of the fuse test points when changing between commanded states.
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