Diagnostic Test

1) LOW COOLANT LEVEL SWITCH
NOTE: Ensure that the coolant is filled to the proper level before proceeding with this test.

Disconnect the Low Coolant Level Switch harness connector.

With the scan tool in Inputs/Outputs, read the Low Coolant Switch state.

Does the scan tool display: Closed?

Yes
1. Go To step 2).
No
1. Replace the Low Coolant Switch in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST .
2) (G18) LOW COOLANT FLUID LEVEL SENSE CIRCUIT SHORT TO GROUND

Fig 1: Measuring Resistance Between Ground And Low Coolant Fluid Level Sense Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Low Coolant Level Switch harness connector.

Disconnect the Instrument Cluster harness connector.

Measure the resistance between ground and the (G18) Low Coolant Fluid Level Sense circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (G18) Low Coolant Fluid Level Sense circuit for a short to ground.
2. Perform BODY VERIFICATION TEST .
No
1. Replace and configure the Instrument Cluster in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST .