Radiator Fan High Speed Circuit Troubleshooting

NOTE: Before beginning this troubleshooting procedure, refer to the symptom troubleshooting index. Check the No. 19 (30 A) fuse in the under-hood fuse/relay box. Is the fuse OK?
YES | - | Go to Step 2 .
NO | - | Replace the fuse and recheck.■
Remove the radiator fan relay from the multi-fuse/relay box, and test it. Is the relay OK?
YES | - | Go to Step 3 .
NO | - | Replace the radiator fan relay .■
Measure the voltage between radiator fan relay 4P socket terminal No. 1 and body ground. Is there battery voltage?
YES | - | Go to Step 4 .
NO | - | Check for an open in the wire between the under-hood fuse/relay box and radiator fan relay 4P socket terminal No. 1.

Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire. Does the radiator fan run?
YES | - | Go to Step 5 .
NO | - | Go to Step 6 .

Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 4 and body ground. Is there battery voltage?
YES | - | Go to Step 9 .
NO | - | Check for an open in the wire between the under-hood fuse/relay box and radiator fan relay 4P socket terminal No. 4.■
Disconnect the radiator fan motor 2P connector. |

Check for continuity between radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2. Is there continuity?
YES | - | Go to Step 8 .
NO | - | Repair an open in the wire between the radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2.■

Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. Is there continuity?
YES | - | Replace the radiator fan motor. ■
NO | - | Check for an open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.■
Reinstall the radiator fan relay. Disconnect the radiator fan switch (High) 2P connector. |

Connect radiator fan switch (High) 2P connector terminal No. 1 and No. 2 with a jumper wire. Does the radiator fan run?
YES | - | Replace the radiator fan switch (High). ■
NO | - | Go to Step 12 .

Remove the jumper wire, and measure the voltage between radiator fan switch (High) 2P connector terminal No. 2 and body ground. Is there battery voltage?
YES | - | Check for an open in the wire between radiator fan switch (High) 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G302.■
NO | - | Repair open in the wire between radiator fan switch (High) 2P connector terminal No. 2 and the under-hood fuse/relay box.■