A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE: Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative. Refer to the symptom troubleshooting index. Before performing symptom troubleshooting, check for powertrain DTCs. Check the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK?
YES | - | Go to Step 2 .
NO | - | Replace the fuse, and recheck.■
Remove the fan control relay from the multi-relay box, and test it. Is the relay OK?
YES | - | Go to Step 3 .
NO | - | Replace the fan control relay.■
Turn the ignition switch ON (II). Measure the voltage between the No. 5 terminal of the fan control relay 5P socket and body ground. Is there battery voltage?
YES | - | Go to Step 5 .
NO | - | Go to Step 17 .
Turn the ignition switch OFF. |

Check for continuity between the No. 2 terminal of the fan control relay 5P socket and body ground. Is there continuity?
YES | - | Go to Step 7 .
NO | - | Check for an open in the wire between the fan control relay and body ground. If the wire is OK, check for poor ground at G302.■
Remove A/C diode B from the left side (LHD) or the right side (RHD) of the dashboard. |

Check for current flow in both directions between the No. 1 and No. 2 terminals of A/C diode B. Is there current flow in only one direction?
YES | - | Go to Step 9 .
NO | - | Replace A/C diode B.■
Make sure the engine coolant temperature is below 93 °C (199 °F). Turn the ignition switch ON (II). |

Measure the voltage between the No. 2 terminal of A/C diode B 2P connector and body ground. Is there battery voltage?
YES | - | Go to Step 12 .
NO | - | Repair open in the wire between the A/C condenser fan relay and A/C diode B.■
Turn the ignition switch OFF. Reinstall the A/C diode B. Disconnect climate control unit connector B (16P). Turn the ignition switch ON (II). |

Measure the voltage between the No. 12 terminal of climate control unit connector B (16P) and body ground. Is there battery voltage?
YES | - | Check for loose wires or poor connections at climate control unit B (16P) and at A/C diode B 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■
NO | - | Repair open in the wire between A/C diode B and the climate control unit.■

Measure the voltage between the No. 7 terminal of under-hood fuse/relay box connector E (16P) and body ground with the under-hood fuse/relay box connectors connected. Is there battery voltage?
YES | - | Repair open in the wire between the under-hood fuse/relay box and the fan control relay.■
NO | - | Repair open in the wire between the No. 30 fuse in the under-dash fuse/relay box and the under-hood fuse/relay box.■