electrical issue
Thread Starter
Driver School Candidate
Joined: Sep 2020
Posts: 6
Likes: 1
From: Washington
electrical issue
I've got a 1996 ES300 and after I went through the car was it has been blowing the fuse for the guage cluster and climate control unit
I'm wondering if anyone has had this happen to them and what they traced it to
also is it possible/easy to put them on their own fuse so it's less of a load on one fuse to run both
thanks
I'm wondering if anyone has had this happen to them and what they traced it to
also is it possible/easy to put them on their own fuse so it's less of a load on one fuse to run both
thanks
Lead Lap
Joined: Nov 2019
Posts: 3,689
Likes: 1,101
From: Michigan
Hello,
Which fuse is in question? Here is a fuse diagram that will show you names and locations for all the fuses in the car.
What actions get the fuse to blow? Does it happen right after you turn the ignition on, maybe switch something else on (like A/C for example), or just at random?
The very first thing you can do is check for any loose or damaged connectors that may have gotten affected by water. If that won't help, here you can find a current flow chart, it will show you everything that is connected to a specific fuse, and it also has a wiring diagram that will help you locate all the components in the flow chart within the circuit. Disconnect or turn off everything that goes to the fuse and see if there will still be any connection to ground by using a test light in place of a fuse. If with everything disconnected you still have connection to ground, it will indicate that either something is still plugged in, or there is an issue with the wiring. If not, put the fuse back and start connecting everything until fuse would pop, that will indicate a faulty system. At least that is the way I see it, hopefully someone else can correct me if I am wrong.
Hope this helps and best of luck!
Which fuse is in question? Here is a fuse diagram that will show you names and locations for all the fuses in the car.
What actions get the fuse to blow? Does it happen right after you turn the ignition on, maybe switch something else on (like A/C for example), or just at random?
The very first thing you can do is check for any loose or damaged connectors that may have gotten affected by water. If that won't help, here you can find a current flow chart, it will show you everything that is connected to a specific fuse, and it also has a wiring diagram that will help you locate all the components in the flow chart within the circuit. Disconnect or turn off everything that goes to the fuse and see if there will still be any connection to ground by using a test light in place of a fuse. If with everything disconnected you still have connection to ground, it will indicate that either something is still plugged in, or there is an issue with the wiring. If not, put the fuse back and start connecting everything until fuse would pop, that will indicate a faulty system. At least that is the way I see it, hopefully someone else can correct me if I am wrong.
Hope this helps and best of luck!
Thread Starter
Driver School Candidate
Joined: Sep 2020
Posts: 6
Likes: 1
From: Washington
Hello,
Which fuse is in question? Here is a fuse diagram that will show you names and locations for all the fuses in the car.
What actions get the fuse to blow? Does it happen right after you turn the ignition on, maybe switch something else on (like A/C for example), or just at random?
The very first thing you can do is check for any loose or damaged connectors that may have gotten affected by water. If that won't help, here you can find a current flow chart, it will show you everything that is connected to a specific fuse, and it also has a wiring diagram that will help you locate all the components in the flow chart within the circuit. Disconnect or turn off everything that goes to the fuse and see if there will still be any connection to ground by using a test light in place of a fuse. If with everything disconnected you still have connection to ground, it will indicate that either something is still plugged in, or there is an issue with the wiring. If not, put the fuse back and start connecting everything until fuse would pop, that will indicate a faulty system. At least that is the way I see it, hopefully someone else can correct me if I am wrong.
Hope this helps and best of luck!
Which fuse is in question? Here is a fuse diagram that will show you names and locations for all the fuses in the car.
What actions get the fuse to blow? Does it happen right after you turn the ignition on, maybe switch something else on (like A/C for example), or just at random?
The very first thing you can do is check for any loose or damaged connectors that may have gotten affected by water. If that won't help, here you can find a current flow chart, it will show you everything that is connected to a specific fuse, and it also has a wiring diagram that will help you locate all the components in the flow chart within the circuit. Disconnect or turn off everything that goes to the fuse and see if there will still be any connection to ground by using a test light in place of a fuse. If with everything disconnected you still have connection to ground, it will indicate that either something is still plugged in, or there is an issue with the wiring. If not, put the fuse back and start connecting everything until fuse would pop, that will indicate a faulty system. At least that is the way I see it, hopefully someone else can correct me if I am wrong.
Hope this helps and best of luck!
Lead Lap
Joined: Nov 2019
Posts: 3,689
Likes: 1,101
From: Michigan
Can you please tell the name of the fuse in question? Each fuse box has a diagram on the cover, which states the name and a rate of the fuse. If you don't have the cover, you can find names and locations for all fuses in the car by following the link below. It will be almost impossible to proceed without knowing which fuse is giving you troubles.
https://www.autogenius.info/lexus-es...e-box-diagram/
I would guess that the fuse you are talking about is ECU-B. If my theory is correct and the fuse pops only if you try using A/C Control Unit, I can't think of anything else but the Control Unit being the culprit, since that fuse supplies only back-up power and is not related to any other part of HVAC system. It may also be CIG/RADIO or GAUGE fuse, but I don't see how CIG/RADIO relates to the instrument cluster, and GAUGE fuse is only rated for 10A instead of 15A.
Hope this helps and best of luck!
https://www.autogenius.info/lexus-es...e-box-diagram/
I would guess that the fuse you are talking about is ECU-B. If my theory is correct and the fuse pops only if you try using A/C Control Unit, I can't think of anything else but the Control Unit being the culprit, since that fuse supplies only back-up power and is not related to any other part of HVAC system. It may also be CIG/RADIO or GAUGE fuse, but I don't see how CIG/RADIO relates to the instrument cluster, and GAUGE fuse is only rated for 10A instead of 15A.
Hope this helps and best of luck!
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Thread Starter
Driver School Candidate
Joined: Sep 2020
Posts: 6
Likes: 1
From: Washington
Can you please tell the name of the fuse in question? Each fuse box has a diagram on the cover, which states the name and a rate of the fuse. If you don't have the cover, you can find names and locations for all fuses in the car by following the link below. It will be almost impossible to proceed without knowing which fuse is giving you troubles.
https://www.autogenius.info/lexus-es...e-box-diagram/
I would guess that the fuse you are talking about is ECU-B. If my theory is correct and the fuse pops only if you try using A/C Control Unit, I can't think of anything else but the Control Unit being the culprit, since that fuse supplies only back-up power and is not related to any other part of HVAC system. It may also be CIG/RADIO or GAUGE fuse, but I don't see how CIG/RADIO relates to the instrument cluster, and GAUGE fuse is only rated for 10A instead of 15A.
Hope this helps and best of luck!
https://www.autogenius.info/lexus-es...e-box-diagram/
I would guess that the fuse you are talking about is ECU-B. If my theory is correct and the fuse pops only if you try using A/C Control Unit, I can't think of anything else but the Control Unit being the culprit, since that fuse supplies only back-up power and is not related to any other part of HVAC system. It may also be CIG/RADIO or GAUGE fuse, but I don't see how CIG/RADIO relates to the instrument cluster, and GAUGE fuse is only rated for 10A instead of 15A.
Hope this helps and best of luck!
Lead Lap
Joined: Nov 2019
Posts: 3,689
Likes: 1,101
From: Michigan
The problem is that I have a 2000 ES300, so I cannot test if what is written below is safe to do, so proceed only on your own risk.
From what I was able to piece together, GAUGE fuse you showed on the picture provides power for the Climate Control Unit, as well as theoretically to all the servos through that unit. In theory, to see what causes the issue, you can try disconnecting all the connectors except for the Blue 8-pin one, and see if at least the unit itself will fire up without blowing the fuse. If so, check servomotors, A/C magnetic clutch, basically everything that connects to the Climate Control Unit. However, if even with all but the Blue connectors disconnected, the fuse is still getting blown, it is probably the Climate Control Unit itself at fault. The theory behind it is that the Blue connector is what supplies power to the unit, every other connector is just to give instructions to servos and relays, and collect sensor information. The unit itself should be able to function without those connectors in place, it just won't be able to control anything, and it will have to be reset by removing the negative battery terminal after you are done to erase all the self-diagnostics error codes that will pop up. You can find information on how to get to the Climate Control here.
Again, that's just my theory, it doesn't mean that I am right. I would appreciate if someone would correct me if I am wrong..
Hope this helps and best of luck!
From what I was able to piece together, GAUGE fuse you showed on the picture provides power for the Climate Control Unit, as well as theoretically to all the servos through that unit. In theory, to see what causes the issue, you can try disconnecting all the connectors except for the Blue 8-pin one, and see if at least the unit itself will fire up without blowing the fuse. If so, check servomotors, A/C magnetic clutch, basically everything that connects to the Climate Control Unit. However, if even with all but the Blue connectors disconnected, the fuse is still getting blown, it is probably the Climate Control Unit itself at fault. The theory behind it is that the Blue connector is what supplies power to the unit, every other connector is just to give instructions to servos and relays, and collect sensor information. The unit itself should be able to function without those connectors in place, it just won't be able to control anything, and it will have to be reset by removing the negative battery terminal after you are done to erase all the self-diagnostics error codes that will pop up. You can find information on how to get to the Climate Control here.
Again, that's just my theory, it doesn't mean that I am right. I would appreciate if someone would correct me if I am wrong..
Hope this helps and best of luck!
Thread Starter
Driver School Candidate
Joined: Sep 2020
Posts: 6
Likes: 1
From: Washington
The problem is that I have a 2000 ES300, so I cannot test if what is written below is safe to do, so proceed only on your own risk.
From what I was able to piece together, GAUGE fuse you showed on the picture provides power for the Climate Control Unit, as well as theoretically to all the servos through that unit. In theory, to see what causes the issue, you can try disconnecting all the connectors except for the Blue 8-pin one, and see if at least the unit itself will fire up without blowing the fuse. If so, check servomotors, A/C magnetic clutch, basically everything that connects to the Climate Control Unit. However, if even with all but the Blue connectors disconnected, the fuse is still getting blown, it is probably the Climate Control Unit itself at fault. The theory behind it is that the Blue connector is what supplies power to the unit, every other connector is just to give instructions to servos and relays, and collect sensor information. The unit itself should be able to function without those connectors in place, it just won't be able to control anything, and it will have to be reset by removing the negative battery terminal after you are done to erase all the self-diagnostics error codes that will pop up. You can find information on how to get to the Climate Control here.
Again, that's just my theory, it doesn't mean that I am right. I would appreciate if someone would correct me if I am wrong..
Hope this helps and best of luck!
From what I was able to piece together, GAUGE fuse you showed on the picture provides power for the Climate Control Unit, as well as theoretically to all the servos through that unit. In theory, to see what causes the issue, you can try disconnecting all the connectors except for the Blue 8-pin one, and see if at least the unit itself will fire up without blowing the fuse. If so, check servomotors, A/C magnetic clutch, basically everything that connects to the Climate Control Unit. However, if even with all but the Blue connectors disconnected, the fuse is still getting blown, it is probably the Climate Control Unit itself at fault. The theory behind it is that the Blue connector is what supplies power to the unit, every other connector is just to give instructions to servos and relays, and collect sensor information. The unit itself should be able to function without those connectors in place, it just won't be able to control anything, and it will have to be reset by removing the negative battery terminal after you are done to erase all the self-diagnostics error codes that will pop up. You can find information on how to get to the Climate Control here.
Again, that's just my theory, it doesn't mean that I am right. I would appreciate if someone would correct me if I am wrong..
Hope this helps and best of luck!
thanks for all the help
Lead Lap
Joined: Nov 2019
Posts: 3,689
Likes: 1,101
From: Michigan
In any way, thanks for the follow-up!
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