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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1136 (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 2008 Cadillac CTS. 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 ON, test for poor connections at the IPC or a faulty IPC.
  3. Ignition ON, disconnect the coolant level switch.
    • If the low coolant level indicator turns OFF with the switch disconnected, test the coolant level switch signal circuit for a short to ground.
    • If the low coolant level indicator does not turn OFF with the switch disconnected, replace the coolant level switch.
    • If the signal circuit tests normal, inspect for poor connections at the BCM or a faulty BCM.
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