94 Accord BLOWER works with car off and key out!
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The circuit for the engine compartment cooling fans is not exactly the same as for the blower fan control circuit. The A/C condenser fan relay is not the same as the blower motor relay.
It may be an issue with the blower motor relay, which is located in the under-dash fuse/relay box. That relay is located a little higher than the fuses. It is the middle relay in a row of 3 relays.
It may be an issue with the blower motor relay, which is located in the under-dash fuse/relay box. That relay is located a little higher than the fuses. It is the middle relay in a row of 3 relays.
Last edited by redbull-1; Nov 25, 2013 at 05:40 PM. Reason: grammar
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From: Indiana
Redbull, I think that is incorrect. If you go back and re-read the entire threadyou will find out otherwise.
I went ahead and looked again at the under hood fuse box. The fuse I pulled was CONDENSOR FAN fuse. The 2 green lights and fan wentoff. There were other fuses in there toofor BLOWER FAN. But the problem shouldbe on the CONDENSOR FAN circuit as it turned off.
Anyonehave any ideas?
I went ahead and looked again at the under hood fuse box. The fuse I pulled was CONDENSOR FAN fuse. The 2 green lights and fan wentoff. There were other fuses in there toofor BLOWER FAN. But the problem shouldbe on the CONDENSOR FAN circuit as it turned off.
Anyonehave any ideas?
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If there was anything done on the car right before you started having this problem, then let us know.
Since you can turn off the fan using the switch, then the ground side of the circuit is ok.
You are getting power to blower relay and the recirculation motor with the key turned off and that should not be happening.
Your next step will be to pull the #8 fuse in the engine bay fuse box. It is 7.5 amp. See attached pic for location.
Let us know if the recirculation light and/or the blower are turned off when the key is removed.
Since you can turn off the fan using the switch, then the ground side of the circuit is ok.
You are getting power to blower relay and the recirculation motor with the key turned off and that should not be happening.
Your next step will be to pull the #8 fuse in the engine bay fuse box. It is 7.5 amp. See attached pic for location.
Let us know if the recirculation light and/or the blower are turned off when the key is removed.
Redbull, I think that is incorrect. If you go back and re-read the entire threadyou will find out otherwise.
I went ahead and looked again at the under hood fuse box. The fuse I pulled was CONDENSOR FAN fuse. The 2 green lights and fan wentoff. There were other fuses in there toofor BLOWER FAN. But the problem shouldbe on the CONDENSOR FAN circuit as it turned off.
Anyonehave any ideas?
I went ahead and looked again at the under hood fuse box. The fuse I pulled was CONDENSOR FAN fuse. The 2 green lights and fan wentoff. There were other fuses in there toofor BLOWER FAN. But the problem shouldbe on the CONDENSOR FAN circuit as it turned off.
Anyonehave any ideas?
The #8 (7.5A) fuse protects several circuits: recirculation control motor, heater control panel, rear window defogger indicator light, mode control motor, radiator fan control module, A/C compressor clutch relay, A/C thermostat, rear window defogger relay, and blower motor relay.
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Posts: 12
From: Indiana
Can you please tell me what to do next so I can fix this?
Where is the blower fan relay located? I just took a quick look under the dash under the glove compartment. Didn’t really see any relay but I could be wrong. There is also a small fuse box located on left side of driver’s foot under dash.
Once I located Blower Fan Relay, then what do I do next?
Thank you.
Where is the blower fan relay located? I just took a quick look under the dash under the glove compartment. Didn’t really see any relay but I could be wrong. There is also a small fuse box located on left side of driver’s foot under dash.
Once I located Blower Fan Relay, then what do I do next?
Thank you.
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The blower motor relay, which is located in the under-dash fuse/relay box, is located a little higher than the fuses. See attached pic.
I also included the circuit diagram for the blower control.
You can pull the relay and test it, PAhonda posted the instructions for the test of the relay previously, see post #11 in this thread.
If the relay is working properly, then there may be a short somewhere like in the wiring or other component that is energizing the relay to close the relay (which would provide power to the blower motor). Normally, that relay is open.
I also included the circuit diagram for the blower control.
You can pull the relay and test it, PAhonda posted the instructions for the test of the relay previously, see post #11 in this thread.
If the relay is working properly, then there may be a short somewhere like in the wiring or other component that is energizing the relay to close the relay (which would provide power to the blower motor). Normally, that relay is open.
Last edited by redbull-1; Jan 12, 2014 at 04:10 PM. Reason: images removed
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In the under-hood fuse/relay box, the radiator fan relay and the power window relay may be the same type as the blower motor relay (located in the under-dash fuse/relay box. You may be able to swap one of the relays to see if it is due to a faulty blower motor relay.
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Joined: Nov 2013
Posts: 12
From: Indiana
Sorry for the delay in posting. Bad weather and holiday season delayed me.
Okay. I did exactly as you said. I pulled the under dash blower fan relay. I am glad that you attached the pic because I really needed that. Once I pulled the relay, the blower fan stopped working. But the 2 green lights stayed on. Per your instructions I took the window motor relay from the under hood fuse box and swapped it out with the blower fan relay. They both had markings of MITSUBA RC-2225 so they were identical. Once swapped, the same exact problems occurred as before swapping out the relays.
I am wondering if perhaps the 2 green lights (vents, recirculation) may have its own relay and perhaps that is the problem? Perhaps anytime the green lights are on it supplies power to the blower fan? Thisis driving me nuts.
Any thoughts?
Okay. I did exactly as you said. I pulled the under dash blower fan relay. I am glad that you attached the pic because I really needed that. Once I pulled the relay, the blower fan stopped working. But the 2 green lights stayed on. Per your instructions I took the window motor relay from the under hood fuse box and swapped it out with the blower fan relay. They both had markings of MITSUBA RC-2225 so they were identical. Once swapped, the same exact problems occurred as before swapping out the relays.
I am wondering if perhaps the 2 green lights (vents, recirculation) may have its own relay and perhaps that is the problem? Perhaps anytime the green lights are on it supplies power to the blower fan? Thisis driving me nuts.
Any thoughts?
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There is no relay for the heater control panel.
There is probably a short. This is what I think is happening:
There is a Blk/Yel wire (from No.8 fuse in under-dash fuse box) that leads to the heater control panel and blower motor, this wire normally only gets power when the ignition is turned to ON or START (see the circuit diagram I previously posted).
From what you described, it sounds like the White wire (which is always Hot coming from the No. 34 under-hood fuse) from the A/C compressor control circuit, may be touching one of the Blk/Yel wires coming from the No. 8 fuse (there are several Blk/Yel wires that branch off from the No. 8 fuse to supply power to different components). One possibility maybe some wire insulation melted, partially cut away, etc. Power from the White wire may be backfeeding the Blk/Yel wire from the short.
Although the A/C compressor control and blower circuit control are on separate circuits, the White wire (No. 34 fuse in under-hood fuse box) from the A/C compressor control does comes into the cabin to connect to the Radiator Fan Control Module, where one of the the Blk/Yel wire from the No. 8 fuse also goes to. The Radiator Fan Control Module is located behind the glove compartment (see attached pictures). Take a look at the wiring harness and connector there, there may even be a possibility of a short in the module itself.
There is probably a short. This is what I think is happening:
There is a Blk/Yel wire (from No.8 fuse in under-dash fuse box) that leads to the heater control panel and blower motor, this wire normally only gets power when the ignition is turned to ON or START (see the circuit diagram I previously posted).
From what you described, it sounds like the White wire (which is always Hot coming from the No. 34 under-hood fuse) from the A/C compressor control circuit, may be touching one of the Blk/Yel wires coming from the No. 8 fuse (there are several Blk/Yel wires that branch off from the No. 8 fuse to supply power to different components). One possibility maybe some wire insulation melted, partially cut away, etc. Power from the White wire may be backfeeding the Blk/Yel wire from the short.
Although the A/C compressor control and blower circuit control are on separate circuits, the White wire (No. 34 fuse in under-hood fuse box) from the A/C compressor control does comes into the cabin to connect to the Radiator Fan Control Module, where one of the the Blk/Yel wire from the No. 8 fuse also goes to. The Radiator Fan Control Module is located behind the glove compartment (see attached pictures). Take a look at the wiring harness and connector there, there may even be a possibility of a short in the module itself.
Last edited by redbull-1; Jan 12, 2014 at 04:10 PM. Reason: images removed
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No, fuse 17 is a completely different fuse.
Fuse no. 34 is not part of the blower motor control circuit, that is why it is not shown in the above the blower control diagram.
Fuse no. 34 is part of the A/C compressor control circuit and engine cooling fan circuit, which I haven't posted.
Fuse no. 8 does supply power as part of both the cabin blower circuit and the engine cooling fan circuits. Generally, each fuse may protect and provide power via several wires to several components and circuits.
From comparing the two circuit diagrams, the common place where I see where they may come near each other is at or near the radiator fan control module and it's wiring harness. That is why I suspect the short may be near there and it may be backfeeding the Blk/Yel wire.
Fuse no. 34 is not part of the blower motor control circuit, that is why it is not shown in the above the blower control diagram.
Fuse no. 34 is part of the A/C compressor control circuit and engine cooling fan circuit, which I haven't posted.
Fuse no. 8 does supply power as part of both the cabin blower circuit and the engine cooling fan circuits. Generally, each fuse may protect and provide power via several wires to several components and circuits.
From comparing the two circuit diagrams, the common place where I see where they may come near each other is at or near the radiator fan control module and it's wiring harness. That is why I suspect the short may be near there and it may be backfeeding the Blk/Yel wire.