Honda Civic. Manual — part 765

Fig. 53: Checking Current Flow In Both Directions Between A/C Diode A
Terminals No. 1 And No. 2

Is there current flow in only one direction?

YES - Go to step 39.

NO - Replace A/C diode A.

41. Turn the ignition switch ON (II).
42. Measure the voltage between the A/C diode A 2P socket terminal No. 2 and

body ground.

Fig. 54: Measuring Voltage Between A/C Diode A 2P Socket Terminal No.
2 And Body Ground

Is there battery voltage?

YES - Replace the under-hood fuse/relay box (see REMOVAL AND
INSTALLATION ).

NO - Repair open in the wire between the No. 36 (10 A) fuse in the under-dash
fuse/relay box and A/C diode A.

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING

1. Check the No. 6 (20 A) and No. 15 (7.5 A) fuses in the under-hood fuse/relay

box.

Are the fuses OK?

YES - Go to step 2.

NO - Replace the fuses, and recheck. If the fuses blow again, check for a short
in the No. 6 (20 A) and No. 15 (7.5 A) fuses circuit.

2. Remove the A/C condenser fan relay from the under-hood fuse/relay box, and

test it (see POWER RELAY TEST ).

Is the relay OK?

YES - Go to step 3.

NO - Replace the A/C condenser fan relay.

3. Measure the voltage between the A/C condenser fan relay 4P socket terminal

No. 1 and body ground.

NOTE:

Do not use this troubleshooting procedure if the A/C
compressor is inoperative. Refer to the SYMPTOM
TROUBLESHOOTING INDEX.

Before performing symptom troubleshooting, check for
powertrain DTCs, R18A1 engine (see GENERAL
TROUBLESHOOTING INFORMATION ), K20Z3 engine
(see GENERAL TROUBLESHOOTING INFORMATION ).

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

Fig. 55: Measuring Voltage Between A/C Condenser Fan Relay 4P Socket
Terminal No. 1 And Body Ground

Is there battery voltage?

YES - Go to step 4.

NO - Replace the under-hood fuse/relay box (see REMOVAL AND
INSTALLATION ).

4. Connect the A/C condenser fan relay 4P socket terminals No. 1 and No. 2 with

a jumper wire.

Fig. 56: Connecting A/C Condenser Fan Relay 4P Socket Terminals No. 1
And No. 2 With Jumper Wire

Does the A/C condenser fan run on high?

YES - Go to step 5.

NO - Replace the under-hood fuse/relay box (see REMOVAL AND
INSTALLATION ).

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

5. Disconnect the jumper wire.
6. Turn the ignition switch ON (II).
7. Measure the voltage between the A/C condenser fan relay 4P socket terminal

No. 4 and body ground.

Fig. 57: Measuring Voltage Between A/C Condenser Fan Relay 4P Socket
Terminal No. 4 And Body Ground

Is there battery voltage?

YES - Go to step 8.

NO - Go to step 16.

8. Turn the ignition switch to LOCK (0).
9. Check for continuity between the fan control relay 5P socket No. 2 terminal

and body ground.

Is there continuity?

YES - Go to step 10.

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 G301.

10. Reinstall the A/C condenser fan relay.
11. Jump the SCS line with the HDS.

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)