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 ECM/PCM connector B (24P).

4.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 - Check that the terminals are firmly seated at the connectors. If OK, substitute a known-good  Engine Control Module (ECM)/ Powertrain Control Module (PCM) and recheck.n