Schematic Reference: Body Control System Schematics in Body Control System

Connector End View Reference: Cooling System Connector End Views

DEFINITION: The check coolant level display is always on when the key is in the ON position.

1

Did you perform the Instrument Cluster Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gages, and Console

1. Turn the ignition ON, with the engine OFF.
2. With a scan tool, observe the low coolant switch parameter in the climate control panel HVAC system data list.

Does the low coolant switch display open?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

1. Disconnect the coolant level switch connector.
2. Connect a 3-amp fused jumper wire between the coolant level switch signal circuit and the coolant level switch ground circuit, at the harness connector of the coolant level switch.

Does the low coolant switch display closed on the scan tool?

Go to Step 7

Go to Step 4

Connect a 3-amp fused jumper wire from the coolant level switch signal circuit at the coolant level switch harness connector to a good ground.

Does the low coolant switch display closed on the scan tool?

Go to Step 6

Go to Step 5

Test the signal circuit of the coolant level switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

Repair the open or high resistance in the coolant level switch ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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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

Inspect for poor connections at the harness connector of the HVAC control module. 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

Replace the coolant level switch. Refer to Radiator Surge Tank Replacement .

Did you complete the replacement?

Go to Step 11

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Replace the HVAC control module. Refer to HVAC Control Module Replacement in HVAC Systems - Automatic.

Did you complete the repair?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2