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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1864 (Engine Cooling System) >> Diagnostic Information and Procedures >> Low Engine Coolant Indicator Always On >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Circuit/System Verification must be performed before performing the Circuit/System Testing.
  1. Turn ON the ignition, with the engine OFF.
  2. Verify that the low coolant indicator turns ON and OFF with each command when the instrument cluster indicators are commanded ON and OFF with a scan tool.
    • If the low coolant level indicator does NOT turn OFF, test for poor connections at the IPC or a faulty IPC.
  3. Ignition ON, disconnect the coolant level switch.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test the circuit for a short to ground.
  5. Ignition ON, use a 3A fused jumper wire to connect harness terminal A to terminal B.
    • If the low coolant level indicator turns OFF, replace the coolant level switch.
    • If the low coolant level indicator does not turn OFF, test the signal circuit of the coolant switch for an open circuit or high resistance.
    • If the signal circuit test normal, inspect for poor connections at the BCM or a faulty BCM.
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