Question about 1987 Toyota Camry

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The gas gauge, heat gauge, O.D., C/C, rear window defogger, heater, A/C, and seatbelts stopped working

I used some motor wash as per instructions rinsed it off and all the above stopped working. I found a burnt out fuse replaced it and all was good about a day. Then it all stopped again but this time I dont see a burnt fuse does some one know a place to start or put me on the right track ?

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1 Answer

My heater only works some of the time and my rear defrost dont work what could be the problem


As by heat only works some of the time , you mean it doesn't blow air out of the vent's . This means you probably have a problem with the blower motor or blower motor resistor or blower motor relay .
Rear Window Defogger Inoperative

    Exchange the rear defogger relay with a known good relay from the under hood junction block.
  1. Turn the ignition switch to the ON position.
  2. Press the rear defogger switch to the ON position.
Does the rear defogger grid warm?
--
Yes Go to Step 2
NO Go to Step 3

2

Replace the faulty relay.
Is the repair complete?
Go to Defogger System Check --

3

  1. Use a fused jumper wire in order to backprobe between terminal A4 of underhood junction block connector C3 and ground.
  2. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 23

4

  1. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
  2. Press the rear defogger switch to the ON position.
Does the test lamp light?
--
Go to Step 5
Go to Step 14



Mar 23, 2016 | 1999 Oldsmobile Alero

1 Answer

I have a 2006 Pontiac g6 gt and my heat or air will not turn on or rear defrost


You have a computer controlled HVAC system ! It has the capability of setting DTC'S - diagnostic trouble codes !
The HVAC control module is a non-GMLAN device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive and ignition 3 voltage circuits provide power to the control module. The HVAC control module during defrost mode will change the A/C compressor LED status from on to off. The control head displays recirc, outside air, A/C and rear defrost feedback status through LED indicators. The control head has a rear defrost request switch please refer to Rear Window Defogger Description and Operation in Stationary Windows for operation. The HVAC control head will display NO COMMUNICATION when checking DTCs or doing a vehicle diagnostic system check refer to Diagnostic Trouble Code (DTC) List - Vehicle and Diagnostic System Check - Vehicle in Vehicle DTC Information.
The rear window defogger system consists of the following components:
?€¢
Body control module (BCM)


?€¢
Heating, ventilation, and air conditioning (HVAC) control module


?€¢
Rear Defog relay


?€¢
Rear window defogger grid


Your probably better off taking this to a ASE certified repair facility ! You probably have bad Heater / A/C control panel . HVAC Control Module Malfunction

May 06, 2015 | Pontiac Cars & Trucks

2 Answers

Why is my rear defrost not working


Switch, fuse or maybe the wiring to the window has come loose or off, happens alot, kits are available at local auto parts stores...
I hope that helps...

Mar 02, 2015 | 2008 Chevrolet Malibu

2 Answers

Rear window defroster not working


Your Monte Carlo uses the rear defogger grid as a radio antenna but the two circuits are not supposed to interact. The defogger circuit receives power input from several sources, including the A/C CRUISE FUSE in the left I/P junction block, the load management control circuit in the BCM, and the RT IP 3 FUSE in the bottom of the underhood junction block so you can see how the current drain of the defogger could affect dash illumination and engine idle.

With regard to your driver's side seat heater issue, it draws power through the LH HTD ST/BCM fuse but the problem could be a defective switch, relay, or the heating elements themselves.

Dec 10, 2013 | Chevrolet Monte Carlo Cars & Trucks

1 Answer

Remove


Original equipment rear auto glass is not designed to have the "heating element" removed...these lines are imbedded into the glass during production. If your current rear defogger is not working, you have a few options. You can replace the entire rear glass (very costly), you can add a new aftermarket defogger strip and connect to original equipment wiring...(maybe to many lines for your viewing...or you can add a rear blower motor vent to the rear shelf...(most effective, aftermarket kits are vailable, probably your best choice to address a need for a rear window defogger. Hope this helps.

May 02, 2013 | Cars & Trucks

1 Answer

My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

Jul 13, 2017 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

I have a 2000 Chevy Cavalier the heater and the rear defogger doesnt work both quit working at same time


Try taking a hose off the heater core for the front heater to see if your core is blocked, this might indicate a core cleaning.  As for your rear window defogger, the wire that usually feeds the  heater might be severed or cracked and you might not get a proper contact. Take the small plug off the heater strip and stick an Ohm meter on it to see if you have an open or closed circuit.

Jan 17, 2009 | Chevrolet Cavalier Cars & Trucks

2 Answers

Where is the fuse for the rear window defogger?


The rear defogger is fuse #14 (40 Amp fuse) in the underhood fuse box,no other fuses, I have the owners manual. If the fuse checks good test the heater grid of the rear defogger, it is most likely is an open circuit, it can be repaired by the dealer or u..

Jan 16, 2009 | 1997 Ford Thunderbird LX

1 Answer

Rear window defogger stopped working


More than likely something has scratched the film that heats up to do the defrosting, Look to make sure it has both wires attached, and use either a test light (make one out of a 12volt bulb and wire if you do not have one.) See if you have electricity to the wires at the ends. If you do, you have a break in the film. You should be able to see where it is broken or scratched. There is an after market repair kit for this, that is not really expensive.

Dec 21, 2008 | 2003 Oldsmobile Alero

1 Answer

2001 Sienna rear window defogger doesn't work


There are 3 fuses that control the rear defogger, and 1 relay

The fuses are: 10 amp HEATER, 10 amp MIRROR-HEATER; under the dash
The 30 amp DEF fuse is in the fuse box under the hood
The relay is the DEFOGGER relay, which is on the back side of the fuse panel under the dash

Also, check for a loose wire on the defroster grid (on the back glass), this is the most common problem.


Oct 19, 2008 | 2001 Toyota Sienna

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