Radiator Fan Switch Circuit Troubleshooting

Radiator Fan Switch Circuit Troubleshooting
1. Disconnect the radiator fan switch connector.
2. Turn the ignition switch ON (II).





3. Measure the voltage between the No. 2 terminal on the radiator fan switch connector and body ground.
Is there battery voltage?
YES - Go to step 4.
NO - Repair open in the GRN wire between the radiator fan switch connector and main under-hood fuse/relay box.





4. Turn the ignition switch OFF, and check for continuity between the No. 1 terminal on the radiator fan switch connector and body ground.
Is there continuity?
YES - Go to step 5.
NO - Check for an open in the BLK wire between the radiator fan switch connector and body ground. If the wire is OK, check for a poor ground at G301.
5. Check the cooling system.
Is the cooling system OK ?
YES - Replace the radiator fan switch.
NO - Repair the cooling system.