Circuit/System Testing

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The coolant heater cord will read Open due to an internal thermal switch if the ambient temperature is above -18°C (0°F).

Ignition OFF, disconnect the coolant heater cord from the E19 Coolant Heater.
Test for 30-40 Ω between the terminals of the E19 Coolant Heater.
- If not within 30-40 Ω
  Replace the E19 Coolant Heater.
- If within 30-40 Ω
Test for infinite resistance between each terminal of the E19 Coolant Heater and ground.
- If less than infinite resistance
  Replace the E19 Coolant Heater.
- If infinite resistance
Test or replace the coolant heater cord.