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09-15-2010, 09:45 AM | #1 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
Location: YORK, ENGLAND
Posts: 21
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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? |
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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09-15-2010, 11:45 AM | #3 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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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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09-15-2010, 12:22 PM | #4 |
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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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09-15-2010, 01:00 PM | #5 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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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 |
09-15-2010, 01:28 PM | #6 | |
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Quote:
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09-15-2010, 12:50 PM | #7 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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Thank you - I will take a look and see if it has one.
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09-16-2010, 09:18 AM | #8 |
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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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09-16-2010, 11:02 AM | #9 |
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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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09-16-2010, 01:45 PM | #10 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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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. |
09-17-2010, 08:34 AM | #11 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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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. |
09-29-2010, 06:17 AM | #12 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
Location: YORK, ENGLAND
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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. |
09-30-2010, 09:34 AM | #13 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
Location: YORK, ENGLAND
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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. |
09-30-2010, 12:09 PM | #14 |
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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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09-30-2010, 03:01 PM | #15 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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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. |
10-01-2010, 08:25 AM | #16 |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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Just had a call from the dealer - they have found a bad earth. Apparently it is now fixed!
Let's see if they have! |
10-01-2010, 08:40 AM | #17 |
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10-01-2010, 02:18 PM | #18 | |
Drives: 2009 YARIS 1.0 VVTi Join Date: Aug 2009
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Quote:
They have today fitted an auxillary earth strap from the blower motor to the car. The reason being that they now think there is a fault with the earth wire in the car's multiplex wiring harness and by doing this is it will prove whether this is the case. (They have changed every other component in the system) I have to run the car for a few weeks and see if this has cured the problem. Everything is checking out o.k. now with the voltage. If this turns out to be the problem they are going to fit a complete new wiring harness. |
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