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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Lighting Systems) >> Diagnostic Information and Procedures >> Park, License, and/or Tail Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Parklamp Switch parameter while cycling the headlamp switch between the Park and Off positions. The parameter should cycle between Active and Inactive.
    • If the backlighting does not turn On and OFF or remains always ON, replace the driver door switch.
  2. Ignition ON, command the Parking Lamps ON and OFF with a scan tool. Verify the park, license, and tail lamps turn ON and OFF between commanded states.
    • If any of the parking lamps are always OFF or remain always ON, refer to the appropriate Park, License, and/or Tail Lamps Circuit Test -- Domestic or Export.
    • If just the license lamps on an export vehicle are always OFF, refer to License Lamps Circuit Test -- Export
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