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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1539 (Engine Cooling System - Non-Hybrid) >> Diagnostic Information and Procedures >> Low Engine Coolant Indicator Always On >> Circuit/System Testing

Circuit/System Testing

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NOTE: Circuit/System Verification must be performed before performing the Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the B33 coolant level switch.
  2. Test for less than 5 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a 3 A fused jumper wire between the B33 signal circuit terminal A and the ground circuit terminal B.
  4. Engine operating, observe the DIC. Verify the low engine coolant level message does not display.
    • If the message continues to be displayed, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC control module.
  5. If all circuits test normal, replace the B33 coolant level switch.
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