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Radiator Fan Circuit Troubleshooting

  1. Check the No. 30 (30 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to Step 2 .
NO -
Replace the fuse and recheck.■
  1. Remove the radiator fan relay, and test the radiator fan relay.
Is the relay OK?
YES -
NO -
Replace the radiator fan relay and recheck.■
  1. Measure the voltage between the radiator fan relay 4P socket terminal No. 2 and body ground.
Is there battery voltage?
YES -
Go to Step 4 .
NO -
Repair open in the wire between the under-dash fuse/relay box and the radiator fan relay 4P socket terminal No. 2.■
  1. Disconnect the radiator fan motor 2P connector.

  1. Check for continuity between the radiator fan relay 4P socket terminal No. 1 and the radiator fan motor 2P connector terminal No. 2.
Is there continuity?
YES -
Go to Step 9 .
NO -
Repair open in the wire between the radiator fan relay 4P socket terminal No. 1 and the radiator fan motor 2P connector terminal No. 2.■

  1. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to Step 7 .
NO -
Repair open in the wire between the under-dash fuse/relay box and the radiator fan relay 4P socket terminal No. 1.■
  1. Disconnect the radiator fan motor 2P connector.

  1. 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 9 .
NO -
Repair open in the wire between the radiator fan relay 4P socket terminal No. 2 and the radiator fan motor 2P connector terminal No. 2.■

  1. Check for continuity between the radiator fan motor 2P connector terminal No. 1 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G202.■