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Toyota Camry Fuse and Electrical Questions

874 messages,  Last post on Dec 07, 2009 at 9:06 AM

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What is this discussion about? Toyota Camry, Electrical, Sedan


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#587 of 874
Re: Faulty Integration Relay? [iconoclast187] by kiawah
Jul 05, 2009 (7:20 am)
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Replying to: iconoclast187 (Jul 05, 2009 7:12 am)

Okay...weird that they started working, but we'll take that as some progress. I would continue to be slightly worried since we didn't actually find the root cause of the failure. You may have an intermittent ignition switch. You should continue to monitor those items closely.
 
You may want to swap out your 10A Gauge fuse, with another 10A Gauge fuse. That circuit feeds a lot of control circuitry, I want to eliminate that fuse from being a problem....even though it might look okay to you right now. I'd feel better if we had actually found a failing component above.
 
You need to verify that power is getting up to the second circuit as mentioned above in note 584. Pull those fuses and check that they are getting power fed to them from the buss, and that they are okay. Also check to see if your rear brake lights are working or not, and whether your rear 'running' lights are working (the lights within your brake lights that come on when your headlights are on).
#588 of 874
Re: Faulty Integration Relay? [kiawah] by iconoclast187
Jul 05, 2009 (9:23 am)
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Replying to: kiawah (Jul 05, 2009 7:20 am)

All the fuses on the 2nd circuit are fine, and I can confirm that at least the power, OBD, and door fuse are getting power.
My break lights are working, however the rear 'running lights' are not.
#589 of 874
Re: Faulty Integration Relay? [iconoclast187] by kiawah
Jul 05, 2009 (9:39 am)
Reply

Replying to: iconoclast187 (Jul 05, 2009 9:23 am)

Okay, give me a couple mins to study the schematics
 
Do you have Daytime Running Lights, or not?
 
DRL = front head lights that are on all the time during the daylight hours
#590 of 874
Re: Faulty Integration Relay? [kiawah] by iconoclast187
Jul 05, 2009 (9:52 am)
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Replying to: kiawah (Jul 05, 2009 9:39 am)

No I do not have daytime running lights.
 
Thanks for taking all of this time.
#591 of 874
Re: Faulty Integration Relay? [kiawah] by kiawah
Jul 05, 2009 (10:00 am)
Reply

Replying to: kiawah (Jul 05, 2009 9:39 am)

This second problem (wiper being the first) might be the integration relay as you first thought, but lets try to zero in to be sure.
 
Check whether your glove box light works or not. I suspect not. If it does NOT work, then verify that the 7.5A Panel fuse does NOT have any power in the fuse socket that would power that fuse. If all of that is true and the panel fuse is not getting powered, then either:
- your taillight relay is bad, or
- your taillight relay isn't getting turned on by the integration relay.
 
If the 7.5A panel fuse does not have power, then pull the taillight relay out of it's socket, and short in the socket from pin 5 (which should have 13volts on it in the socket), and pin 3. Pin 3 feeds the 7.5 panel fuse. When you short these pins, your glove box light (as well as the dashboard switch lights ...radio switch light, ac switch light, etc) should get power and turn on. You may have to read the pin numbers from the relay, and then be careful to choose the right corresponding pins in the socket. If you are not sure of the pins, then do not jumper the socket.
 
Alternatively, if you understand how relay's work, and have an ohmmeter, I can walk you thru how to test that your taillight relay is good or not.
#592 of 874
Re: Faulty Integration Relay? [kiawah] by kiawah
Jul 05, 2009 (10:56 am)
Reply

Replying to: kiawah (Jul 05, 2009 10:00 am)

At this point, until we can isolate it down more....I suspect either:
- a couple relays are bad (taillight relay, and headlight relay)
- your integration relay is bad (controls both of those relays)
- your headlight stalk switch is bad (controls the integration relay)
 
And then I still have suspicions about why your windshield wiper had a problem, which may be your ignition switch
#593 of 874
Re: Faulty Integration Relay? [kiawah] by iconoclast187
Jul 05, 2009 (11:17 am)
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Replying to: kiawah (Jul 05, 2009 10:00 am)

Well, my glovebox light is NOT on, but there IS 13 volts to the panel fuse socket.
#594 of 874
Re: Faulty Integration Relay? [iconoclast187] by kiawah
Jul 05, 2009 (11:39 am)
Reply

Replying to: iconoclast187 (Jul 05, 2009 11:17 am)

You should have power to that 7.5A panel fuse, when the light stalk is in a lights on position. That turns on the integration relay, turning on the taillight relay, providing power to the panel fuse.
 
Power to the panel fuse, should light up:
- the glove box, when the glovebox switch is opened
- cigaretter lighter illumination
- ac switch illumintation, and blower switch, and ac control assembly, etc
- lightbulb in the hazard switch, and radio, etc.
 
So when the power is on to that panel fuse, are all of those other lightbulbs turning on (could be your glovebox light is burnt out).
 
When you turn the light stalk to the off position, do those lights turn off?
#595 of 874
Re: Faulty Integration Relay? [kiawah] by iconoclast187
Jul 05, 2009 (12:20 pm)
Reply

Replying to: kiawah (Jul 05, 2009 11:39 am)

Ok, I went back out to recheck and realized i had my multimeter on the wrong scale the first time. There appears to be a latent 1.3v-1.4v current on the panel fuse port with the light stalk switch ON or OFF. So I guess it is not getting the power it should. Sorry for the confusion.
 
Glovebox does not light up.
The hazard switch light does not come on with the hazards on or off.
The cig lighter ring light does not come on with the cig lighter active or not.
The a/c on-off switch (green light) and windshield blower (amber light) light up when I turn the AC blower on. Otherwise they are off. (A/C itself works fine)
Radio itself works. The radio screen backlight comes on when you turn the radio on. (Radio itself works fine)
 
So I guess we are back to the taillight relay.
#596 of 874
Re: Faulty Integration Relay? [iconoclast187] by kiawah
Jul 05, 2009 (12:36 pm)
Reply

Replying to: iconoclast187 (Jul 05, 2009 12:20 pm)

Let's try to eliminate the relay from being the source of the problem.
 
Here's how to check out the relay, you appear very technical.
 
Take the relay out of the socket, and check it with some wiring you hook up.
 
The primary of the taillight relay, is +13 volts on pin 1, and ground to pin 2. When you apply this voltage, the primary coil of the relay should then connect the secondary points together. The secondary of the relay, are pins 5 and 3. When there is no power on the coil primary, you should have infinite resistance between 5 and 3. So check the resistance between 5 and 3, with nothing else connected to the relay, to verify that you have infinite resistance.
 
Now with two small pieces of wire, hooked to +13volts and ground each, lets test to see that the relay is energizing correctly. When you connect 13volts to pin 1, and ground pin 2, you should hear and feel the relay energize, and you should now have zero resistance between pins 5 and 3. Check to see if you now have zero resistance when the relay is energized.
 
If the relay is working correctly with this test, then the problem is that it isn't getting turned on. That would mean either your light stalk switch is bad, or your integration relay is bad.

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