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Heated Seats Question
CF Beginner
Joined: Feb 2012
Posts: 15
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the thermistor is in the cord. If it wasn't, you would not have seen any difference in operation with the new cord.
The ecm can set dtc's when the ect and iat sensor readings fail logic tests, in certain conditions, due to the block heater. Gm has performed ect and harness relocations to prevent this.
the 120volt block heater cord is a stand alone system and has no electrical interaction with a 12volt ecm.
remove the cord and put an ohm meter on it; above -18 degrees it will be open and closed below that temp. the block heater element will read approx 35 ohms at all times.
The ecm can set dtc's when the ect and iat sensor readings fail logic tests, in certain conditions, due to the block heater. Gm has performed ect and harness relocations to prevent this.
the 120volt block heater cord is a stand alone system and has no electrical interaction with a 12volt ecm.
remove the cord and put an ohm meter on it; above -18 degrees it will be open and closed below that temp. the block heater element will read approx 35 ohms at all times.
Super Moderator
Joined: Mar 2011
Posts: 9,175
Likes: 521
I am a general motors grand master tech. I work in Canada. I've performed campaigns to correct the conditions you describe. Sounds like you have it all under control.
Last edited by tech2; Nov 13, 2012 at 6:39 PM.
Super Moderator
Joined: Mar 2011
Posts: 9,175
Likes: 521
the bulletin is #10-06-04-008B. Its not a campaign so you will have to pay to get this work done. Your explaination of the concern were vague so I suggest you review it and be sure it applies to your particuluar case.
CF Beginner
Joined: Feb 2012
Posts: 15
Likes: 0
the very first issue was how to get my factory heated seats to come on with the remote start it is a 08 impala LTZ - the block heater was another issue
all of a sudden I am getting replies I wired the seats wrong etc no wonder people get confused
I did find the bulletin but need to talk to dealer how it works as it only says to move the sensor the other side of the block (maybe making it cool enough not to effect the computor)
all of a sudden I am getting replies I wired the seats wrong etc no wonder people get confused
I did find the bulletin but need to talk to dealer how it works as it only says to move the sensor the other side of the block (maybe making it cool enough not to effect the computor)
CF Beginner
Joined: Feb 2012
Posts: 15
Likes: 0
I have not had time to go to dealership to see wha all is involved Like you say there is stuff missing from the bulletin
temps have been ok here -15 C the worst so far hopefully I can get moving on this project next week
temps have been ok here -15 C the worst so far hopefully I can get moving on this project next week
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