Mechanics

AC AND HEATER DONT WORK

2002 Honda CRV

Air Conditioning problem
2002 Honda CRV Four Wheel Drive Automatic

My 2002 Honda CRV is the best, but I cant find out whats wrong with the ac/heater, 1 day it was blowing and working but the next it wasn't, so I have done a lot of elimination like its not a fuse, or relay. When you trun on the car and then the ac knob on the fan kicks on but then right off, could that be the problem. I also know the fan works because my dad hooked up a battier to it and it works just fine. My dad thinks its the knobs that are in the car that are broken.
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Martin_092282
October 27, 2009.




Hi martin_092282,

If the blower motor works as described, yes it is possible the control know is bad.

Testing of the power output would be required to find out if it is the cause.

Did you try turning the fan speed to maximum and does it work?

KHLow2008
Nov 1, 2009.
Yea I have tryed the knobs and it dont matter what speed I put it on it does not work. But when im going fast air comes out of the vents not a lot but still, if I turn it to hot it gets hot if I turn it to cold its not cold but cool. I have look bin looking different things on the net and havent seen anything that it could be.
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Tiny
Martin_092282
Nov 3, 2009.
The fan blower motor is not working and you need to find out why.

See if the following is of any help.

A Problem in the Blower Motor Circuit

1 . Check the No. 12 (40A) fuse in the under-hood fuse/relay box, and the No. 14 (10A) fuse in the under-dash fuse/relay box.
Are the fuses OK ?
YES - Go to step 2.
NO - Replace the fuse(s), and recheck.

2 . Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig23_1.jpg



3 . Turn the ignition switch ON (II).
Does the blower motor run?
YES - Go to step 4.
NO - Go to step 17 .

4 . Turn the ignition switch OFF.
5 . Disconnect the jumper wire.
6 . Disconnect the power transistor 4P connector.
7 . Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig24_1.jpg



Is there continuity?
YES - Go to step 8.
NO - Check for an open in the wire between the power transistor and body ground.

8 . If the wire is OK, check for poor ground at G501. Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig25_1.jpg



9 . Turn the ignition switch ON (II).
Does the blower motor run at high speed?
YES - Go to step 10.
NO - Repair open in the wire between the power transistor and the blower motor.

10 . Turn the ignition switch OFF.
11 . Disconnect the jumper wire.
12 . Disconnect the heater control panel 30P connector.
13 . Check for continuity between the No. 16 and No. 17 terminals of the heater control panel 30P connector and body ground individually.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig26_1.jpg



Is there continuity?
YES - Repair any short to body ground in the wire(s) between the heater control panel and the power transistor.
NO - Go to step 14.

14 . Check the continuity between the following terminals of the heater control panel 30P connector and the power transistor 4P connector.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig26a_1.jpg




http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig27_1.jpg



Is there continuity?
YES - Go to step 15.
NO - Repair any open in the wire(s) between the heater control panel and the power transistor.

15 . Reconnect the heater control panel 30P connector.
16. Test the power transistor (see Power Transistor Test ).
Is the power transistor OK ?
YES - Check for loose wires or poor connections at the heater control panel 30P connector and at the power transistor 4P connector. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.
NO - Replace the power transistor.

17 . Disconnect the jumper wire.
18 . Disconnect the blower motor 2P connector.
19 . Measure the voltage between the No. 1 terminal of the blower motor 2P connector and body ground.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig28_1.jpg



Is there battery voltage?
YES - Replace the blower motor.
NO - Go to step

20. Turn the ignition switch OFF.
21. Remove the blower motor relay from the under-hood fuse/relay box, and test it.
Is the relay OK?
YES - Go to step 22.
NO - Replace the blower motor relay.

22 . Measure the voltage between the No. 3 terminal of the blower motor relay 4P socket and body ground.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig29_1.jpg



Is there battery voltage?
YES - Go to step 23.
NO - Replace the under-hood fuse/relay box.

23 . Turn the ignition switch ON (II).
24. Measure the voltage between the No. 2 terminal of the blower motor relay 4P socket and body ground.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig30_1.jpg



Is there battery voltage?
YES - Go to step 25.
NO - Repair open in the wire between the No. 14 fuse in the under-dash fuse/relay box and the blower motor relay.

25 . Turn the ignition switch OFF.
26 . Check for continuity between the No. 1 terminal of the blower motor relay 4P socket and body ground.


http://www.2carpros.com/forum/automotive_pictures/192750_BlowerMotor02CRVFig31_1.jpg



Is there continuity?
YES - Repair open in the BLU/WHT wire between the blower motor relay and the blower motor.
NO - Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G301.


KHLow2008
Nov 4, 2009.

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