Radiator Fan Switch Circuit Troubleshooting (Short)

Radiator Fan Switch Circuit Troubleshooting (Short)
1. Remove the radiator fan relay from the main underhood fuse/relay box, and test it.
Is the relay OK?
YES - Go to step 2.
NO - Replace the radiator fan relay.
2. Remove the radiator fan switch, and test it.
Is the radiator fan switch OK?
YES - Go to step 3.
NO - Replace the radiator fan switch.
3. Disconnect the negative cable from the battery.
4. Disconnect Engine Control Module (ECM) connector A (25P) and the under-hood fuse/relay box 16P connector.





5. Check for continuity between the No. 2 terminal of the radiator fan switch 2P connector and body ground.
Is there continuity?
YES - Repair a short in the wire between the radiator fan switch 2P connector terminal No. 2 and main under-hood fuse/relay box.
NO - Replace the main under-hood fuse/relay box.