A/C is not working

DIEGOCA1

MEMBER
2003 TOYOTA SEQUOIA

A/c controls are not working. Can not turn on a/c or do any action with a/c knobs, Fuses are good. I also checked voltage on the connector side. Everything checks out. It's just blank screen on the a/c controls. Does nothing. I don't know if its related to the coolant temp gauge not working as we'll? Faulty control panel? I have already replace integrated panel for it and it still doesn't work

9 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Did you test the voltage going to the panel and its groud cuircuit?

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Monday, February 18th, 2013 AT 12:35 AM

DIEGOCA1

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2 POSTS

Yes I have checked voltage between terminals acc and gnd of integration control and panel. The spec for voltage should be between 10-14 v and I'm getting 12 volts out of it. My apology khllow. I replaced the a/c amplifier that goes behind the panel. The integrated panel you speak of is it the whole piece? Why would I replace that?

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Saturday, December 31st, 2016 AT 10:56 PM

TIM JEWETT

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5 POSTS

I thought I would follow up on my progress. Lights and buttons for 4x4, hazard lights, clock, passenger seat belt all work. However, A/C control did not. After checking some more fuses I was going to replace the control panel with the previous one. The car was running while I was doing this, and when I disconnected one of the connectors on the back of the panel the A/C control light came on and I was able to control the HVAC. Not only that, the temperature gauge began to work. Then I received a second control panel yesterday and plugged it in and it solve the problem!

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Friday, January 6th, 2017 AT 2:16 PM

STEVE W.

MECHANIC
13,443 POSTS

Nice work, we are here to help, please use 2CarPros anytime.

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Friday, January 6th, 2017 AT 2:31 PM

LESLIE MARTIN JOHNSON

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1 POST

My 2004 Sequoia control panel front and rear are stuck they self-corrected a couple of times but now they're permanently stuck at 68 degrees loaf and none of the buttons are responsive front or back. I checked the battery and the fuses suggestions? 68 degrees with the fan on low.

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Monday, April 29th, 2019 AT 10:55 AM

STEVE W.

MECHANIC
13,443 POSTS

The common cause for a stuck on temperature system are the interior temperature sensors. They fail and the system defaults to a programmed level that was determined to be comfortable as it cannot tell what the temperature really is. Your vehicle has 2 of them. The front one is on the drivers side of the the dash about where a knee would set. It looks like a small speaker grill. Use a trim tool or screwdriver, with tape on it to protect the plastic, and it just pries out. There is an electrical connector and tube attached. Remove those and replace them on the new sensor.
The rear is on the drivers side on the wheel arch near the seat. It just pops out as well.

To verify that one is the issue needs a scan tool to check which one is not reporting the proper temperature. This will also tell you if the sensors are the problem as it could be internal to the controller. But the sensors are a good bet, especially if you have pets as the hair will plug the sensor.

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