Circuit/System Testing
WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect each KR20 cooling fan relay one at a time, in the order listed below, ignition ON:
- KR20C Cooling Fan Low Speed Relay
- KR20P Cooling Fan Medium Speed Relay
- KR20D Cooling Fan High Speed Relay
- Verify that the cooling fan is not activated after each relay is removed.
- If the cooling fan is ON with all of the listed relays removed
- Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON.
- Test for less than 1 V between ground and the relay controlled output circuit terminal listed below:
- KR20C Cooling Fan Low Speed Relay terminal 30
- KR20P Cooling Fan Medium Speed Relay terminal 30
- KR20D Cooling Fan High Speed Relay terminal 30
- If 1 V or greater, repair the short to voltage in the appropriate circuit.
- If the cooling fan is OFF after a listed relay is removed
- Replace the appropriate KR20 Cooling Fan Relay.
NOTE:
The following tests must be performed on each cooling fan relay.