( TL19E30A14426149411FAAT00 )

Radiator Fan Circuit Troubleshooting

Check the No. 3−6 (30 A) fuse in the under-hood fuse/relay box and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are the fuses OK?

YES	-	Go to Step 2 .
NO	-	Replace the fuse(s) and recheck.■

Remove the radiator fan relay and the relay circuit board from the under-hood fuse/relay box, and test the radiator fan relay and fan control relay.

Is the relays OK?

YES	-	Go to Step 3 .
NO	-	Replace the radiator fan relay and/or relay circuit board and recheck.■

Is the motor OK?

YES	-	Go to Step 4 .
NO	-	Replace the radiator fan motor. ■

Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and body ground.

Is there battery voltage?

YES	-	Go to Step 5 .
NO	-	Replace the under-hood fuse/relay box.■

Measure the voltage between the radiator fan relay 4P socket terminal No. 4 and body ground.

Is there battery voltage?

YES	-	Go to Step 7 .
NO	-	Replace the under-hood fuse/relay box.■

Check for continuity between the radiator fan relay 4P socket terminal No. 2 and the radiator fan motor 2P connector terminal No. 2.

Is there continuity?

YES	-	Go to Step 10 .
NO	-	Repair open in the wire between the under-hood fuse/relay box and the radiator fan motor 2P connector terminal No. 2.■

Make sure the HDS communicates with the vehicle and the engine control module (ECM)/powertrain control module (PCM). If it doesn't communicate, troubleshoot the DLC circuit.

Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).

NOTE: This step must be done to protect the ECM/PCM from damage.

Check for continuity between the radiator fan relay 4P socket terminal No. 3 and ECM/PCM connector terminal A5.

Is there continuity?

YES	-	Go to Step 16 .
NO	-	Repair open in the wire between the under-hood fuse/relay box and ECM/PCM connector terminal A5.■

Check for continuity between the radiator fan motor 2P connector terminal No. 1 and under-hood fuse/relay box connector B11.

Is there continuity?

YES	-	Go to Step 18 .
NO	-	Repair open in the wire between the under-hood fuse/relay box and the radiator fan motor 2P connector terminal No. 1.■

Check for continuity between under-hood fuse/relay box connector D10 and ECM/PCM connector terminal A6.

Is there continuity?

YES	-	Go to Step 19 .
NO	-	Repair open in the wire between the under-hood fuse/relay box and ECM/PCM connector terminal A6.■

Check for continuity between under-hood fuse/relay box connector B1 and body ground.

Is there continuity?

YES	-	Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
NO	-	Repair open in the wire between the under-hood fuse/relay box and body ground. If the wire is OK, check for a poor ground at G301.■