For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The low coolant indicator is always on when the key is in the ON position.
1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gages, and Console
2 |

1. Turn the ignition ON, with the engine OFF.
2. With a scan tool command the instrument cluster indicators ON and OFF.

Does the low coolant indicator lamp turn ON and OFF with each command?

Go to Step 3

Go to Step 5

3 | Disconnect the coolant level switch connector. Does the low coolant indicator turn off? | Go to Step 6 | Go to Step 4
4 | Test the signal circuit of the coolant level switch for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7
5 | Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). 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 8
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 9
7 | 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
8 | Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console. Did you complete the repair? | Go to Step 11 | --
9 | Replace the coolant level switch. Refer to Radiator Surge Tank Replacement . Did you complete the replacement? | Go to Step 11 | --
10 | Important: Perform the recalibration 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 replacement? | 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