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Is the coolant light still on?
Are you asking how to fix the coolant light or if the dealer's diagnostic process was accurate?
The Visa card I used is a refund from AT&T which can be used by anyone accepting Visa and must be used as a credit card. Let me know if there is a problem.
There was an error with your transaction. Here's the error that was given by our credit card processor: [C] Invalid response from gateway: 530.
It sounds like they followed the correct diagnostic process. I will explain the process that I would use to diagnose your issue, which should be close/identical to the process that the technician used. Please refer to the diagrams below and I will walk you through the diagnostic process step by step:
I would begin by checking the resistance across the coolant level sensor to make sure the resistance is good. If the resistance is out of range, I would replace the coolant level sensor.
Next I would check the connector pin # XXXXX (connector C3) on the BCM to see if it is recieving signal from the coolant level sensor.
If there is no signal, and the light is on, then I would continue checking the system (see next step).
If there is no signal, and the light is on, then I would test the pin #19 (connector C4) on the BCM. This wire controls signal to the instrument panel. If this wire is sending a signal, then I would replace the BCM. If not then I would continue checking the system.
Next I would check the wire going from the BCM pin # XXXXX to the cluster. If the wiring and the BCM was good, then I would replace the instrument cluster.
Please let me know if there is anything else I can do to assist you.