Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Ignition OFF, disconnect series/parallel relay, which is FAN CTRL relay.
Ignition ON, activate the fan relay 1 with a scan tool. The fan should be OFF.
- If the fan is activated, test the left fan ground circuit terminal 1 for a short to ground.
Ignition OFF, disconnect the remaining fan relays.
Connect a 30A fused jumper between the normally-open switch contact terminals 30 and 87 at series/parallel 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 87 at each relay connection listed below and verify the appropriate fan activation:
- FAN AUX Relay
- Fan Main Relay
- 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 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 fan relay connections listed below and verify the appropriate fan activation:
- FAN AUX Relay
- Fan Main Relay
- If the appropriate fan does not activate, test the relay switch voltage supply circuit for a short to ground or high resistance.
If the circuits and fans test normal, replace the relay.