Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. 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 series/parallel relay.
- Ignition ON, activate the cooling fan relay 1 with a 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 remaining relays.
- Install a 30A fused jumper between the normally-open switch contact terminals 30 and 87 at the series/parallel relay connector in order to complete the 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.
- Cooling fan relay 1 or cooling fan relay 2 = terminal 87
- Cooling fan series/parallel relay = terminal 87A
- 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 30 and the fan voltage supply circuit terminal 87 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 an open/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.