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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Lighting System) >> Diagnostic Information and Procedures >> Hazard Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
  2. Test for less than 5 Ω between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for less than 5 Ω between the ground circuit terminal F and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool Hazard Lamp Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal G for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal G and ground. Verify the scan tool Hazard Lamp Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, replace the turn signal/multifunction switch.
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