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Old 09-15-2010, 09:45 AM   #1
motoxxx3
 
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09 Yaris Heater blower problem

I have a very strange problem with my 09 Yaris 1.0 T2 (No aircon)
After 5-10 minutes of driving, the heater blower will suddenly slow down on it's own, then if I lift my foot off the accelerator after 1-2 seconds delay the blower will return to it's normal speed. If I press the accelerator it will immediately slow down again. It does it on all blower speeds.
The dealer has had the car for 6 days - changed the blower motor and the rheostat, but it has not fixed it! Currently waiting for a Toyota field engineer to look at it. Has anyone else had this problem? If so - what was the cause?
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Old 09-15-2010, 10:11 AM   #2
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Does your Yaris have the manual AC controls or the electronic ones? Either way, I would suspect the AC Amplifier, which is the ECU for the heat/AC.
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Old 09-15-2010, 11:45 AM   #3
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It has the manual rotary switch heater controls, with speeds 1-4 and the vehicle does not have air conditioning fitted, so Im not sure if it has an amplifier.
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Old 09-15-2010, 12:22 PM   #4
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Quote:
Originally Posted by motoxxx3 View Post
It has the manual rotary switch heater controls, with speeds 1-4 and the vehicle does not have air conditioning fitted, so Im not sure if it has an amplifier.
I believe that even the non-AC ones have the amplifier. To check, take a look at the bottom of the air box for a black module about 50cm x 50cm x 4 cm. On your RHD car it will be at the bottom of the center console against the firewall in the driver's footwell.
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Old 09-15-2010, 12:50 PM   #5
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Thank you - I will take a look and see if it has one.
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Old 09-15-2010, 01:00 PM   #6
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I have just taken a look and directly underneath the airbox/ducting there is what looks like a silver module bolted to the floor directly behind the centre console.....printed on it - 'Made in U.K.' so it is likely to be be faulty
I will be annoyed with the dealer if it turns out it is this because it looks pretty easy to change..and they could have tried one off of another Yaris.
It's driving me nuts! it is as though somebody is constantly turning the blower speed up and down as Iam driving along
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Old 09-15-2010, 01:28 PM   #7
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Originally Posted by motoxxx3 View Post
I have just taken a look and directly underneath the airbox/ducting there is what looks like a silver module bolted to the floor directly behind the centre console.....printed on it - 'Made in U.K.' so it is likely to be be faulty
I will be annoyed with the dealer if it turns out it is this because it looks pretty easy to change..and they could have tried one off of another Yaris.
It's driving me nuts! it is as though somebody is constantly turning the blower speed up and down as Iam driving along
If the silver module has yellow connectors then you are looking at the SRS ECU (for the airbags). The AC amplifier is black and has one or two (depending on the configuration) white connectors.
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Old 09-16-2010, 05:50 AM   #8
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I have had another look, and the only other thing I can see is a black module with 'fins' on it. It is in bolted to the firewall in the centre of the car - directly in front of the silver SRS ecu behind the centre console.. difficult to see colour of the connectors/wires though. There does not seem to be any module mounted on the firewall in the drivers or passenger side footwells.
I just discovered last night & this morning that it seems like if Iam driving with the car's lights on the heater blower runs at it's correct speed all the time and does not fluctuate with accelerator position. If I turn the lights off it starts to fluctuate again.
Iam going to try this again over a longer period just to be sure.
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Old 09-16-2010, 07:27 AM   #9
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Originally Posted by motoxxx3 View Post
I have had another look, and the only other thing I can see is a black module with 'fins' on it. It is in bolted to the firewall in the centre of the car - directly in front of the silver SRS ecu behind the centre console.. difficult to see colour of the connectors/wires though. There does not seem to be any module mounted on the firewall in the drivers or passenger side footwells.
I just discovered last night & this morning that it seems like if Iam driving with the car's lights on the heater blower runs at it's correct speed all the time and does not fluctuate with accelerator position. If I turn the lights off it starts to fluctuate again.
Iam going to try this again over a longer period just to be sure.

Here's a picture of where it is located on my LHD Yaris. I believe that it is a mirror image of this for RHD cars.

AC Amplifier Location.jpg

Looking at the European EWDs, yours definitely has one (even though it doesn't have A/C). The AC Amplifier has inputs from the headlight switch as well a from the alternator, that let it adjust the heating or cooling operation relative to those inputs. So, the problem being related to having the headlights on or off is quite plausible.
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Old 09-16-2010, 09:11 AM   #10
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Thank you very much for posting the photo.
You can see from the photos of my car that it is different to the U.S. spec car with aircon.
If my vehicle does indeed have a heater amplifier that is connected to the lights it is looking highly likely that this is the faulty component.
Attached Images
File Type: jpg Yaris U.K. LH side.jpg (169.6 KB, 200 views)
File Type: jpg Yaris U.K. RH side.jpg (242.3 KB, 199 views)
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Old 09-16-2010, 09:18 AM   #11
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Hmmm. The silver box is definitely the SRS ECU. If you want to PM me the VIN number for your car, I can verify through the electronic parts catalog if it has it, and if so where it actually is.
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Old 09-16-2010, 11:02 AM   #12
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Very interesting - The EPC shows the AC Amplifier as being "Not Applicable" for your VIN, so that explains why you can't find it. In that case, the controlling mechanism for the blower fan would simply be the HTR relay, which is located in the under dash fuse panel.
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Old 09-16-2010, 01:45 PM   #13
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Thank you very much for all your help Scott.
I know the dealer did not change the relay...and in my head I wondered if it could be the relay, or voltage regulator in the alternator.
Iam going to drive again tonight to see if it does not fluctuate with the lights on.
Really weird problem - I have never know a car to do this before.
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Old 09-17-2010, 08:34 AM   #14
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Tried it again last night, and with the lights turned on the blower fan speed does not fluctuate at all. As soon as I turn them off the blower speed fluctuates with accelerator position.
The Toyota dealer called me today, and they should have a field engineer out to look at my car next week.
I will update as soon as he has reached a conclusion as to what the problem is.
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Old 09-29-2010, 06:17 AM   #15
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The field engineer from Toyota G.B. ran some tests on the car yesterday, and it looks like the problem is a faulty alternator.
They have had to order me one in so I should get my car back tomorrow.
Not good for a car with only 4,000 miles on it.
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Old 09-30-2010, 09:34 AM   #16
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The Toyota dealer has just phoned me - the new alternator has been fitted and it has NOT cured the problem!
They have told me to keep the courtesy car until further notice! Watch this space.
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Old 09-30-2010, 12:09 PM   #17
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Quote:
Originally Posted by motoxxx3 View Post
The Toyota dealer has just phoned me - the new alternator has been fitted and it has NOT cured the problem!
They have told me to keep the courtesy car until further notice! Watch this space.
They didn't per chance verify if your non-A/C Yaris has or doesn't have an AC Amplifier? Based on the European service manual section and EWD, it looks like it does, but based on your looking around and the Electronic Parts Catalog it looks like it doesn't. If it really does, then that is definitely the problem.
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Old 09-30-2010, 03:01 PM   #18
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They have not verified regarding the a/c amplifier as yet. When I mentioned it the service manager did not think my Yaris has this component.
I can tell you they have changed to date: Rheostat, blower motor, relay & alternator.
Iam quickly losing my faith in Toyota. They have had the car now in total 11 days, had a specialist engineer out from Toyota G.B. and they still can't fix it.
They told me the alternator is fluctuating output, dropping below 12 volts at times.
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