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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 >> Front Fog 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. Observe the scan tool Front Fog Lamps Switch parameter while pressing and releasing the fog lamp switch. The parameter should cycle between Active and Inactive.
    • If the parameter does cycle between the specified values, refer to Fog Lamp Switch Circuit Test.
  2. Ignition ON, with a test lamp connected to ground, probe each of the test points on the FOG Fuse while commanding the Fog Lamps 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 Fog Lamp PCB Relay Circuit Test.
    • If the test lamp turns ON and OFF, refer to Fog Lamps Circuit Test
  3. With the fog lamps ON, verify the fog lamp indicator is illuminated on the IPC.
    • If the indicator does not illuminate, refer to Front Fog Lamp Indicator Test.
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