Radiator Fan Switch Circuit Troubleshooting (Short)

1.Remove the radiator fan relay from the under-hood fuse/relay box, and test it.

Is the relay OK?

YES - Go to 2.

NO - Replace the  radiator fan relay.n

2.Remove the radiator fan switch, and test it.

Is the radiator fan switch OK?

YES - Go to 3.

NO - Replace the  radiator fan switch.n

3.Disconnect the negative cable from the battery.

4.Disconnect Engine Control Module (ECM)/Powertrain Control Module (PCM) connector B (24P) and the under-hood fuse relay box 14P 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 short in the wire between the radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.n

NO - Replace the under-hood fuse/relay box.n