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Front defrosting not working?

Tiny
HAMED99
  • MEMBER
  • 2008 TOYOTA CAMRY
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
I was opening the hood the fuse box is specifically and the RR DEF relay the defog relay burnout specifically the wire in the middle. Then I just disconnected the battery by changing the wire to make sure that all the fuses are working correctly under the dashboard, but all the gauges didn't start at all tachometer or fuel gauge nothing was working. The problem extended by turning on the front defogger without opening it so whenever I start ignition the front defogger start by self from the beginning before the car from cranking.
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Monday, April 29th, 2024 AT 3:09 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

It sounds like you provided power to the blower motor that is causing it to turn on when you start the vehicle.

I need to know the color of the wire or wires you repaired. Additionally, I need to know if the vehicle has automatic climate control or manual.

If I understand correctly, when you turn the key on, the blower motor turns on and air comes from the defroster. What I would also like you to do is remove 50-amp heater fuse in the under-hood fuse box and see if the blower still turns on. If it does, then we have power from somewhere other than the fuse.

Let me know.

Joe

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Monday, April 29th, 2024 AT 7:29 PM
Tiny
HAMED99
  • MEMBER
  • 9 POSTS
Automatic climate.

The video shows the rr def: its black and white wire.

I checked where you specified, and the fuses were okay except this one in the blew picture. Even though I fixed it nothing new happen and still front defogger start and it's light blinks and panel fuse if not voltage even though its great condition.

What I noticed that the long light dem all the interior lights and the fuel pump works with the ignition the Camry media screen turned off and on.
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Tuesday, April 30th, 2024 AT 12:08 PM
Tiny
HAMED99
  • MEMBER
  • 9 POSTS
When I reconnect the white wire of rr def I found that the relay is not energized always stationary even though I have testing instruments for relays and it shows that the relay in a good condition.
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Tuesday, April 30th, 2024 AT 1:14 PM
Tiny
HAMED99
  • MEMBER
  • 9 POSTS
Turning on the A/C was making all the dash lights blinking.
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Tuesday, April 30th, 2024 AT 1:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

Good Lord, that doesn't sound good. Is it possible to let me know what wires you repaired or replaced? Also, I need to know if it has a manual or automatic climate control so I can check what was done and see if there are any reasons for this to happen.

Let me know.

Take care,

Joe
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Tuesday, April 30th, 2024 AT 6:09 PM
Tiny
HAMED99
  • MEMBER
  • 9 POSTS
Here is the only wire I fixed of the relay.
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Wednesday, May 1st, 2024 AT 2:11 AM
Tiny
HAMED99
  • MEMBER
  • 9 POSTS
Automatic climate.
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Wednesday, May 1st, 2024 AT 5:34 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

I watched the video. I noticed what appeared to be tape on the rear of the panel. Check to make sure nothing is shorting there.

Additionally, the second wire (white) looks burnt, and an additional wire is wrapped with tape to it. Was the white wire that looks charred where the problem was located?

I attached the complete wiring schematic below for the automatic climate control. Take a look through it and let me know if it helps.

Take care,

Joe

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Wednesday, May 1st, 2024 AT 8:00 PM
Tiny
HAMED99
  • MEMBER
  • 9 POSTS
Can I have a circuit diagram of the integrated fuses?
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Thursday, May 2nd, 2024 AT 11:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The schematics aren't designed like that. I can try to find specific circuits. I did find one for the rear defroster which I attached below.

Let me know.

Joe

See pics below. Also, let me know if the power distribution schematics will help. They are extensive, but I would be happy to send them.
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Thursday, May 2nd, 2024 AT 7:26 PM
Tiny
HAMED99
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I guess the problem is about the starter relay and it's connecting wires if I may get the diagrams for the starter relay.
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Friday, June 14th, 2024 AT 4:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

I'm not sure how the defroster and starter relay are connected, but I attached the wiring schematic below for the starter circuit.

I had to cut the page in half to make it readable, but I overlapped the two so you can follow from one to the next.

I hope this helps.

Take care,

Joe

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Friday, June 14th, 2024 AT 7:15 PM

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