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Home >> Suzuki >> 2009 >> XL7 Limited, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Lighting Systems) >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the underhood fuse block.
  2. Ignition ON, headlamps OFF, verify that a test lamp does not illuminate between the control circuit terminal 38 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Connect a test lamp between the control circuit terminal 38 and B+.
  4. Observe the test lamp while commanding the daytime running lamps (DRL) on and off with a scan tool. The test lamp should turn on and off.
    • If the test lamp is always on, test the control circuit for a short to ground. If the circuit test normal, replace the BCM.
    • If the test lamp is always off, test the control circuit for a open/high resistance. If the circuit test normal, replace the BCM.
  5. Ignition OFF, reconnect the X2 harness connector.
  6. Remove the DRL 1 fuse from the underhood fuse block.
  7. Connect a test lamp between the relay controlled output circuit of the DRL 1 relay and ground.
  8. Observe the test lamp while commanding the daytime running lamps (DRL) on and off with a scan tool. The test lamp should turn on and off.
    • If the test lamp is always on or always off, test or replace the underhood fuse block.
  9. If all circuits test normal, test or replace the ambient light sensor.
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