Blower Relay

[Gary2000TJ]

2000 TJ

Blower Motor Relay

I’ve read many post where some mention a blower relay and I’ve read another comment that we don’t have one. My blower was working great and suddenly went out. The small green, bigger green and black wire connector showed it was burned at some point. It could be wiggled and would work but suddenly went out. I put heat shrink on those.Replaced blower motor, replaced blower switch, replaced fuse behind glove box. 40 amp fuse in engine fuse area looks fine but I don’t know how to test. Are any of the pictures here the relay? One looks a little burned where the wire going in is at. No blower.

 

[Gary2000TJ]

Also replaced resistor

 

[LittleGiant]

Interesting. Had an issue with mine a few months ago where it would only blow on level 3 or 4 and not shut off. I replaced the resistor and it fixed it. Unfortunately that didn’t work for you.

I’ve also read that replaced the control panel has worked for some people

 

[CharlesHS]

Hope this schematic assists you in troubleshooting the problem.

 

[Gary2000TJ]

View attachment 584497

Hope this schematic assists you in troubleshooting the problem.

Thank you.

 

[Gary2000TJ]

Going to try replacing ignition switch and see if that helps. I have abs light on and some have mentioned it can be related to ignition switch and have blower issues. Also some times my jeep won’t turn off immediately when I turn off key, though I noticed this before correcting my ground problem.

 

[CharlesHS]

Going to try replacing ignition switch and see if that helps. I have abs light on and some have mentioned it can be related to ignition switch and have blower issues. Also some times my jeep won’t turn off immediately when I turn off key, though I noticed this before correcting my ground problem.

Keep us informed.,,,
I have heard of the ignition switch and the harness causing quite a few problems.

 

[Gary2000TJ]

 

[Gary2000TJ]

The part that was burnt was attached on the left side here. Makes me think this part should be replaced.

 

[B1Toad]

FYI the black wire is a ground wire and it is attached to G202 in your footwell. From there it goes to the mode switch. Coming out of the mode switch is a dark green wire which brings the ground signal to your fan speed switch. If you want to see if the mode switch is bad you can temporarily bypass it by grounding that dark green wire and if the blower works then it's in the mode switch. All the modes including fan and compressor operation are controlled by the negative, or ground side. The blower positive is supplied straight from the blower relay as soon as the key is switched on.

 

[Gary2000TJ]

FYI the black wire is a ground wire and it is attached to G202 in your footwell. From there it goes to the mode switch. Coming out of the mode switch is a dark green wire which brings the ground signal to your fan speed switch. If you want to see if the mode switch is bad you can temporarily bypass it by grounding that dark green wire and if the blower works then it's in the mode switch. All the modes including fan and compressor operation are controlled by the negative, or ground side. The blower positive is supplied straight from the blower relay as soon as the key is switched on.

Thank you. Let me see if I’m understanding. I remove the middle 12? Gauge wire and I can run a ground to it to test?

I’m going to try replacing the relay if I’m successful at finding it. I’ve looked at diagrams all morning but not sure. It looks like there may be two relays up near my fuses but the diagrams show it near a wire harness or maybe near resistor? I’m at work then have to drive a school bus . My Austic son counts on his rides in the jeep so trying to fix before snow on Friday

 

[B1Toad]

Thank you. Let me see if I’m understanding. I remove the middle 12? Gauge wire and I can run a ground to it to test?

I’m going to try replacing the relay if I’m successful at finding it. I’ve looked at diagrams all morning but not sure. It looks like there may be two relays up near my fuses but the diagrams show it near a wire harness or maybe near resistor? I’m at work then have to drive a school bus . My Austic son counts on his rides in the jeep so trying to fix before snow on Friday

If you connect the black and dark green wires together and switch the key on and the blower works that means the mode switch has failed. If it doesn't work the problem is elsewhere, either in the power side or possibly in the blower speed switch which switches the ground through the different resistor taps to get the different speeds.

 

[Gary2000TJ]

 

[B1Toad]

looks like a smoking gun

 

[LittleGiant]

looks like a smoking gun

View attachment 584675

As my grandpappy would say about about some women…”That’s hard on the eyes”

 

[Gary2000TJ]

looks like a smoking gun

Yeah it melted so much I struggled to get it apart. The part it goes into is ruined so I’ve got one ordered. Connected the green and black wires and left small green attached but nothing happened.

 

[Gary2000TJ]

-Wires melted behind control module. Heat shrink and reattached. If I do again I’m going to length those wires as it is a tight stretch to attach.
-Replacing the relay fixed the problem.
-blower replaced- this hopefully will help with not frying another relay for awhile but touching wires and relay they are warm
-resistor replaced- others indicate they can help blower issues when some settings work but not others on blower speeds
- replaced blower switch- some people have had melted switch behind control panel
-ignition switch- not needed on mine but others indicate it can fix a blower problem

Thanks everyone for the help. If I stated anything that wasn’t correct please correct me so others don’t have bad info when researching their problems

 

[B1Toad]

Nice job and in time for your son's Jeep ride tomorrow which is way more important. BTW it's perfectly normal for the circuit and circuit components to get pretty warm on a motor circuit that draws this kind of current. Warm is OK, too hot to touch is not OK.

 

[Gary2000TJ]

Nice job and in time for your son's Jeep ride tomorrow which is way more important. BTW it's perfectly normal for the circuit and circuit components to get pretty warm on a motor circuit that draws this kind of current. Warm is OK, too hot to touch is not OK.

Yeah he’s been up since 4:00 a.m. looking out the window at the snow coming down. About three inches so far. He’s about ready for a ride I think. An oddity since replacing stuff, I put selector on heat blowing at me or feet and it has no response but on all other selections it works great. Before fix it didnt work on feet but now on straight ahead also. Thankfully defrost seems to be blowing out everywhere, feet, windshield and straight ahead. A/C settings all work.

 

[CharlesHS]

When a component(s), the wiring/harness or connectors heat up and melt; there is usually an underlying reason whether is dirty/loose contacts/connections or a component drawing too many amps due to resistance in the circuit/component(s).
You have found A problem (burned relay), but you may have not found THE problem.
What has caused that problem. ?
I would continue to investigate to see what caused the burned relay OR.... you may find that problem reoccurring....