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.

1. 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.■

1. 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.■

1. Turn the ignition switch ON (II).

1. 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 .

1. Turn the ignition switch OFF.

1. 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.■

1. Remove A/C diode B from the left side (LHD) or the right side (RHD) of the dashboard.

1. 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.■

1. Make sure the engine coolant temperature is below 93 °C (199 °F).

1. Turn the ignition switch ON (II).

1. 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.■

1. Turn the ignition switch OFF.

1. Reinstall the A/C diode B.

1. Disconnect climate control unit connector B (16P).

1. Turn the ignition switch ON (II).

1. 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.■

1. 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.■