Car had a dead battery. Bought and installed new battery however haven't run the vehicle to charge battery to full capacity.

Thanks for info

 

12.4 isn't enough voltage for the computers to run properly. Better get it charged.

Just because it's new doesn't mean it's good.

How do you know if there is still a problem if you haven't even charged the battery? New batteries aren't typically so discharged. It may be bad.

 

There is a TSB 07-08-45-003a about this sort of issue. It should be here, if you don't have an easier source. https://www.chevyhhr.net/forums/prob...-thread-23231/

There is also service campaign 10413 that originally was for Canada only and 10 year limit but I think was expanded.

There was another one for the steering column/PSCM but that was mostly for Cobalt and a specific OBD2 code.

The motor is a known weak spot-

 

If you're going to be doing diagnostics on a vehicle's electrical system, you really should have a battery charger and/or tender available.
Over the years I've accumulated 4 chargers and several battery tenders. Never can have too many.....

 

Thanks guys will get battery charged and read through info provided. Going to try and get to Chevy dealer on probable replacement.for power steering
assist module. Will see what happens.

Thanks again really appreciate you guys. Will let you know what happens.

 

Hey guys, back on line, dealer being down right stubborn to change out the power steering module. After arguing with the dealer, I did some research and found a common thread about all the items not working. Power steering does use the speed sensor on the transmission to control the amount of power needed to turn the steering wheel. Speedometer uses that same speed sensor to detect speeds. Outdoor air temperature also uses the speed sensor on the tranny to calculate, through an algorithm, wind velocity to give you and accurate temperature. Lastly the transmission needs this sensor to shift correctly. My problem is still u0101 no communications. So I checked several items on the pin connector to the TCM 1. TCM pin connector no# 6 pin to DLC no# 6 Pin has continuity. Pin connector no# 7 to DLC no#14 also has continuity. However the other side of the data line TCM connector pin# 37 to DLC no #6 or #14 has no continuity. TCM connector pin no#38 to either DLC pin no #6 or #14 no continuity. I believe there is a break in these wires which should have continuity, am I wrong? I have no idea where the wires go as I don't have a wiring diagram. Tried to see if I could buy one, on line, can't find any place that sells them. Can anyone help me with a wiring diagram of the Computer Data Line Circuit. for a 2006 HHR Info all the other items mentioned, prior to this, were done including charging battery now have 12.9V. Could still be power steering module depending on potential break in the wires.

 

Maybe Donbrew has an easier to read one. I had to cut mine into 3 screenshots.

 

Basically the modules are on a daisy chain circuit with 2 wires on the high speed LAN and 1 wire on the slow LAN. It is a matter of finding which module either isn't getting power or is the end of the functioning chain (everything after the bad module is dead). If you are old enough to remember old fashioned computer networks with coax between the computers and end resistors.

 

Ok, got to thinking about it. Apparently the can bus line goes through the TCM module and goes to the next module to complete the can bus circuit and so on. Readings I got are OK because the circuit was broken cause of the module being unplugged. With all the current readings I got, can bus seems to be ok. Definitely seems like it might be a module, and I think the only way to resolve this is with an oscilloscope. Who knows might be the speed sensor, but I can't get down to those codes if any. A wiring diagram would still help immensely.

 

Thanks for the wiring circuit firemangeorge appreciate it very much.