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2003 Toyota Highlander: No A/C After evaporator installation

Joe Marconi
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Joe Marconi Grand Master

Joe Marconi

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Here’s a tip that might save you a lot of aggravation. One of my techs installed a new A/C evaporator in a 2003 Toyota Highlander. All went smooth until he pushed the A/C button on the dash when he got finished. The A/C button did not light up and there was a code for no communication between the A/C control module to the BCM and to the Dash Cluster.

 

Going thru the troubled charts and pin out charts led to a failed A/C Controller Amplifier. My manager was not ready to order the A/C amplifier, stating that everything was working prior. He felt that something had to go wrong in the reassembly process. He was right.

 

It turns out that there are two identical connectors, one for the vent control servo and one for the max air control servo. They are close to each other and interchanging them is an easy mistake. Switching the connectors was the fix.

 

Two things we learned: The tech needs a review on carefully marking all connectors and we need to be real careful when interpreting trouble flow charts.

 

 

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CARMandP Proficient

CARMandP

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I did a heater core in an early 90's corvette a few months ago and discovered the same thing. Of course, this one wouldn't let the starter engage and all the dash lights were on. LOL talk about annoyed. Who would think that using the same exact plugs side by side was a good idea. Also had the same thing on a nissan altima we put an engine in. appears that they used the same plug for the crank sensor and cam sensor and it won't start when you have these reversed.

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  • 3 weeks later...
Gonzo Grand Master

Gonzo

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A common problem I see on the Highlanders is the A/C control head. If you get one in that they tell you they have to bang on the dash to get it to work look at the ribbon connector inside the control head. What happens is the nut that hold the dial in place comes loose and as they twist the knob it also twists the ribbon connector.

 

Easy fix, ya just have to take the entire control head apart to do it. (Putting together a tech article on this very subject)

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