Henrik Ekroth
New Member
I checked the fuse in fusebox and its ok, i understand these two are powered by same source, dont know how to proceed. Have anyone else seen this problem on your E9?
Henrik
Henrik
Sunroof & Fan does not work
- Thread starter Henrik Ekroth
- Start date
Sunroof off fuse 10, heater blower is off fuse 9. First thing is to clean fuse terminals. Also pull sunroof switch and join the uncovered female terminal with either of the covered ones, sunroof should activate so this is a way to test the switch. Sunroof wire should come off the fuse box and go directly to the right A pillar. One diagram has the wire green/blue, other has it green/black.
mpgandco
Well-Known Member
- Messages
- 138
- Reaction score
- 32
It is the relay up under the dash, by the fuse box.There are three relays up there and just switch them around to see if that is the problem. I think it is the last relay in the group, closest to the fire wall I had the same problem and this is what fixed it.Hope this helps
Henrik Ekroth
New Member
Thank you very much for help, i will have a look and get back to you once i tried them out =)
ATL_Alan
Well-Known Member
Hi, I'm having this problem for the first time in my 3.0 CS that I've owned for 33 years. Are
these the relays you're talking about? They are to the immediate left of the fusebox. It looks like there are four, three very close together and a 4th closest to the firewall. Did you just pull them out randomly and switch them around to get the blower and sunroof to work?
Those relays are described below and do not drive the sunroof or heater fan specifically:
e9coupe.com
@ATL_Alan What year is your coupe?
Relays Under the Dash
I have been trying to help Roger in New York sort out his wiring as he reassembles two coupes. The wiring diagrams are hard to read sometimes and if you have a 73 1/2 when window motors/switches/circuit breakers were added you have to use the early diagram as well as the 74 diagram. There are...
e9coupe.com
@ATL_Alan What year is your coupe?
ATL_Alan
Well-Known Member
Mine is a 74.
ATL_Alan
Well-Known Member
No blown fuses and out of the clear blue the blower (regular or A/C) and the electric sunroof are dead.
On a 74 the A/C fan speed switch overrides the heater blower when A/C fan switch is on. With this fan on, the A/C temp switch turns on A/C compressor and fan by the radiator. Could your A/C fan switch be on by a tiny bit? This would prevent heater fan from working.
Have you tried removing sunroof switch as suggested above?
Have you tried removing sunroof switch as suggested above?
THATS COOL YOU USING MY WIRING DIAGRAM
SO TO THE PROBLEM
SO FOLLOW THE PATH OF POWER AND OF COURSE YOU CAN CHECK THE RELAY
EASY. SEEMS TO BE THE POWER IS NOT GETTING THERE - IS POWER IS THERE WITH A QUICK CHECK AT THE END THEN IT HAS TO BE THE MOTOR
ALTHOUGHT IS BOTH UNITS DONT WORK IT HAS BE THE POWER PATH.
JUST GET AN OMNMETER AND GO THRU IT
YOULL FIND IT THEN
SO TO THE PROBLEM
SO FOLLOW THE PATH OF POWER AND OF COURSE YOU CAN CHECK THE RELAY
EASY. SEEMS TO BE THE POWER IS NOT GETTING THERE - IS POWER IS THERE WITH A QUICK CHECK AT THE END THEN IT HAS TO BE THE MOTOR
ALTHOUGHT IS BOTH UNITS DONT WORK IT HAS BE THE POWER PATH.
JUST GET AN OMNMETER AND GO THRU IT
YOULL FIND IT THEN
one other thing.........sometimes the female spade falls off the back of the fuse box. Sunroof wire should be obvious, only it and the dome light go up the pillar. Follow back to the box, position 10.
ATL_Alan
Well-Known Member
Checked the A/C blower switch and it is all the way off. Then when I pull the lever over to adjust the vent blower speed, nothing is coming out and no noise is being made. When I turn the A/C on and the A/C blower switch on and up, nothing happens.
On the Sunroof switch, I'm not sure what's being described: "Also pull sunroof switch and join the uncovered female terminal with either of the covered ones, sunroof should activate so this is a way to test the switch." When I pull the switch off, I can't get access to the back of the female block because there's not any excess wire to pull it down through the opening. I pulled it down as far as I could with some needle-nose pliers and it basically stops at the switch opening. I can't get any of the block through the opening. I can pull one of the switches off the power windows and try that; the windows all work and the switches look interchangeable.
But I think the issue has to be somewhere in the power path. I'm pretty clueless when it comes to tracing electricity. If someone wants to give some paint by numbers instruction, I have a meter and can try and follow along.
I just saw the message from Bavbob and can go take a look but whatever it is, it's impacting both the blower motor and the sunroof without blowing a fuse.
On the Sunroof switch, I'm not sure what's being described: "Also pull sunroof switch and join the uncovered female terminal with either of the covered ones, sunroof should activate so this is a way to test the switch." When I pull the switch off, I can't get access to the back of the female block because there's not any excess wire to pull it down through the opening. I pulled it down as far as I could with some needle-nose pliers and it basically stops at the switch opening. I can't get any of the block through the opening. I can pull one of the switches off the power windows and try that; the windows all work and the switches look interchangeable.
But I think the issue has to be somewhere in the power path. I'm pretty clueless when it comes to tracing electricity. If someone wants to give some paint by numbers instruction, I have a meter and can try and follow along.
I just saw the message from Bavbob and can go take a look but whatever it is, it's impacting both the blower motor and the sunroof without blowing a fuse.
ATL_Alan
Well-Known Member
Just swapped the sunroof switch and window switch and the sunroof switch will operate the window; the window switch is not doing anything in the sunroof so I must not have power there.
Break this up into smaller jobs...
test fuse #10 at top and bottom of fuse for +12 volts
this is wire # 97 which goes direct to connector 45 and then direct to blower motor wire 236
test fuse #10 at top and bottom of fuse for +12 volts
this is wire # 97 which goes direct to connector 45 and then direct to blower motor wire 236
and you really need to check BOTH ends of the fuse!
Keep in mind the blower motor Speed and on/off is controlled by ground not Positive.
Keep in mind the blower motor Speed and on/off is controlled by ground not Positive.
Last edited:
ATL_Alan
Well-Known Member
I'm getting an audible beep and a reading on the multimeter when I test both ends of the fuse. As far as wires go, I really think I need to get access to the blower so I can see the wires coming out because, as a neophyte, when I look around the fusebox, it seems like there are hundreds going everywhere. It seems easier to start at the blower and work backward towards the fusebox. I don't seen any wires specifically attached to fuse #10 because they're behind the fusebox and that fuse is the hardest to see.
Take off the cover
remove both spade connectors
key on
blower control to high
test for battery voltage on one and ground on the other
remove both spade connectors
key on
blower control to high
test for battery voltage on one and ground on the other
I’ve been looking at the diagrams, the Main Load Shed relay provides power to fuses 9 and 10. It is #2 in the second pic of this thread. Be sure the plug is seated well, perhaps swap it with the window relay next to it and see if it works, pretty easy to do.
Another approach is remove cover over fan blower in front of windshield. Power on, switch on, check for 12v at the motor. As Don says the switch only provides the ground. Do this one last.
e9coupe.com
Another approach is remove cover over fan blower in front of windshield. Power on, switch on, check for 12v at the motor. As Don says the switch only provides the ground. Do this one last.
Relays Under the Dash
I have been trying to help Roger in New York sort out his wiring as he reassembles two coupes. The wiring diagrams are hard to read sometimes and if you have a 73 1/2 when window motors/switches/circuit breakers were added you have to use the early diagram as well as the 74 diagram. There are...
e9coupe.com
ATL_Alan
Well-Known Member
Hi Chris,
How do the load relays come out? It looks like they're each on metal brackets and you slide the whole thing forward but mine are not coming out (easily) and I don't want to force it and break something. I don't know if they're clipped in place or what; it doesn't look like it but it's hard to see. Does the entire component (white plug and black relay) come out, then the bottom (white) piece plug into the top (black) piece? So I'd be swapping the black relays?
Thanks again for your help,
Alan
How do the load relays come out? It looks like they're each on metal brackets and you slide the whole thing forward but mine are not coming out (easily) and I don't want to force it and break something. I don't know if they're clipped in place or what; it doesn't look like it but it's hard to see. Does the entire component (white plug and black relay) come out, then the bottom (white) piece plug into the top (black) piece? So I'd be swapping the black relays?
Thanks again for your help,
Alan