Radiator Fan Switch Circuit Troubleshooting (Open)

Radiator Fan Switch Circuit Troubleshooting (Open)

NOTE: Before beginning this troubleshooting procedure, refer to the symptom troubleshooting index. Symptom Related Diagnostic Procedures

1. Disconnect the radiator fan switch 2P connector.
2. Turn the ignition switch ON (II).





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





4. Turn the ignition switch OFF, and check for continuity between radiator fan switch 2P connector terminal No. 1 and body ground.
Is there continuity?
YES - Replace the radiator fan switch.
NO - Check for an open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.