For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Engine Cooling Schematics
1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | Go To Diagnostic System Check - Engine Cooling
2 | Turn ON the ignition, with the engine OFF. Does the low coolant indicator illuminate? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 | With a scan tool command the instrument panel cluster (IPC) indicators ON and OFF. Does the low coolant indicator turn ON and OFF? | Go to Step 4 | Go to Step 5
4 | Disconnect the coolant level switch. Does the low coolant indicator turn OFF? | Go to Step 6 | Go to Step 8
5 | Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the repair? | Go to Step 11 | --
6 | Inspect for poor connections at the harness connector of the coolant level switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7
7 | Replace the coolant level switch. Refer to Radiator Surge Tank Replacement . Did you complete the repair? | Go to Step 11 | --
8 | Test the low coolant level indicator control circuit of the coolant level switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9
9 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10
10 | Important: Perform the programming procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the repair? | Go to Step 11 | --
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2