Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition OFF, disconnect the R2 cool/fan relay.
- Ignition ON, activate the cooling fan relay 1 with the scan tool. The fan should be OFF.
- If the fan is activated, test the left fan ground circuit for a short to ground.
- Ignition OFF, disconnect the fan relays.
- Connect a 30A fused jumper between the normally-open switch contact terminals at the R2 cool fan relay connector in order to complete the left fan ground circuit. Leave this jumper in place for the remainder of this procedure.
- One at a time, connect a 30A fused jumper between the positive terminal at the battery and the fan voltage supply circuit terminal at the cool/fan 1 and the cool/fan 2 relay connections and verify fan activation.
- If the appropriate fan does not activate, test the fan voltage supply circuit for a short to ground or open/high resistance.
- If the circuit tests normal, test the fan ground circuit for an open/high resistance.
- If the circuits test normal, replace the fan.
- Ignition ON, connect a 30A fused jumper between the relay switch voltage supply circuit terminal and the fan voltage supply circuit terminal at the cool/fan 1 and the cool/fan 2 relay connections and verify fan activation.
- If the fan does not activate, test the relay switch voltage supply circuit for a short to ground or high resistance. If the circuit tests normal and its fuse is open, test all connected components and replace as necessary.
- If the circuits and fans test normal, replace the relay.