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Old 01-17-2014, 07:52 AM   #1
Lepeod
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Default Dangerous Vue !! Unexpected power steering loss

Hello everyone !!! This is my first time every posting so hang in there
Saturn should recall these vehicles before they KILL someone from power steering loss ! My wife has an 07 Vue Awd 3.5 liter with 100k on it. THIS THING IS A DEATHTRAP and i don't want her in it. She lost power steering in it with grandchildren in it and dam near got her killed !!
I've been a mechanic for 30 years and I've never seen any thing like this
And hoping someone has seen this before.
When weather damp and under 42 degrees when started the vehicle will have start and run fine at some point when you move steering wheel ( or load electrical system)
Then all of the interior lights flash like a disco in the 70s , it starts surging, power steering is lost, no power locks. And a few other symptoms.
It's really dangerous In winter. At times my wife leave the house and 5-10 seconds afterwards the power steering is gone. She is small and can't turn it fast enough to avoid an accident. So it stays parked !
What I have found is unplug the alternator while it's running and plug it back in and problem disappears !!! If you let it idle for 2-3 minutes it will cure itself also
Voltage was going to 18.6 at idle. We have already ran all new grounds to Bcm
And checked all others and replaced Bcm and I have even put 2 different alternators. I hear that gm is replacing wiring harness. That seems unnessesary because they can be repaired. Has anyone out there seen this before and found a cure short of trading it off. Lol. Thanks Guys
I've seen a lot of crazy stuff through the years but this tops it.
I have been all over it and so have several gm techs and hate to start throwing g parts at it. Just hoping someone out there has figured these out. Thanks again

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Old 01-17-2014, 09:08 AM   #2
billysvue
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2005 VUE 2.2L
Default Re: Dangerous Vue !! Unexpected power steering loss

Is the voltage still going crazy with the 2nd new alt's? Are they new ?

or rebuilts from a chain store?
or dedicated automotive electrical shop?

Waht about connections to the rack/pinion? Loose or rotted wiring in that area? Maybe squirrels/mice/rats like your wiring...

Local mech's give you a quote to replace the RnP if it's dieing?

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Old 02-03-2014, 09:11 PM   #3
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Default Re: Dangerous Vue !! Unexpected power steering loss

Yes it is. Sorry it took so long for me to reply.

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Old 02-03-2014, 09:13 PM   #4
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Default Re: Dangerous Vue !! Unexpected power steering loss

New alt. all wiring is like new. No mice or anything. No liquid damage in console either

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Old 02-03-2014, 10:06 PM   #5
satlite440
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Default Re: Dangerous Vue !! Unexpected power steering loss

since you are a mechanic.. what are the codes in the ecm/bcm/tcm/and hpcm if applicable??? ecm/bcm xTooltipElement
Service Information


2007 Saturn VUE - AWD | VUE VIN Z Service Manual | Engine | Engine Electrical | Description and Operation | Document ID: 1444921
--------------------------------------------------------------------------------

Charging System Description and Operation
GeneratorThe generator features the following major components:

•The delta stator
•The rectifier bridge
•The rotor with slip rings and brushes
•A conventional pulley
•The regulator
The pulley and the fan cool the slip ring and the frame.

The generator features permanently lubricated bearings. Service should only include tightening of mount components. Otherwise, replace the generator as a complete unit.

RegulatorThe voltage regulator controls the rotor field current in order to limit the system voltage. When the field current is on, the regulator switches the current on and off at a rate of 400 cycles per second in order to perform the following functions:

•Radio noise control
•Obtain the correct average current needed for proper system voltage control
At high speeds, the on-time may be 10 percent with the off-time at 90 percent. At low speeds, the on-time may be 90 percent and the off-time 10 percent.

Circuit DescriptionThe generator provides voltage to operate the vehicle's electrical system and to charge its battery. A magnetic field is created when current flows through the rotor. This field rotates as the rotor is driven by the engine, creating an AC voltage in the stator windings. The AC voltage is converted to DC by the rectifier bridge and is supplied to the electrical system at the battery terminal.

When the engine is running, the generator turn–on signal is sent to the generator from the engine control module (ECM)/powertrain control module (PCM), turning on the regulator. The generator's voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine is started, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. When the voltage regulator detects a charging system problem, it grounds this circuit to signal the PCM that a problem exists. The PCM monitors the generator field duty cycle signal circuit. The system voltage sense circuit receives B+ voltage that is Hot At All Times through the ECM/TCM fuse in the underhood junction block. This voltage is used by the regulator as the reference for system voltage control.

This vehicle uses Class II and controller area network (CAN) communications. The ECM/PCM are CAN and the body controller systems are Class II. The body control module (BCM) acts as the gateway between the different communication protocols. The ECM/PCM requests the battery lamp on the CAN communication line and then the BCM sends a request to the IPC for lamp illumination.

The ECM/PCM will request the battery lamp on under the following conditions:

•The ECM/PCM interprets the ignition is in the accessory position.
•The ECM/PCM is in the RUN power mode with the engine not running.
•Generator L terminal fault has been detected.
•Generator F terminal fault has been detected.
If the generator is not charging, it pulls the F terminal low causing an F terminal fault. Low voltage threshold is 10.5 volts for 4 minutes and engine at least 1,300 RPM. High threshold is 18 volts for 5 minutes.
© 2014 General Motors. All rights reserved.

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Old 03-26-2014, 06:55 AM   #6
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2007 ION-2 Quad Coupe
Default Re: Dangerous Vue !! Unexpected power steering loss

I have a 2007 Saturn ION. on 3/25/2014 while driving I lost Power Steering (PS) when the PWR STRNG light came on. After stopping the car and turning it back on I got the PS back. I went to my mechanic where I was told of the problem either with the PS Motor or the PS Control Module; the PS was working fine at this time. While driving home I lost PS again. Unfortunately I have over 100,000 miles on the car. Any suggestions or comments will be appreciated. I am going to my mechanic this afternoon to have the PS Motor replaced. Thanks for reading.

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Old 05-16-2016, 03:38 PM   #7
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Default Re: Dangerous Vue !! Unexpected power steering loss

Was the Vue ever fixed? On my 3rd bcm and having exact issue.

No CEL light so no codes.

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Old 05-19-2016, 07:51 AM   #8
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2001 SL2
Default Re: Dangerous Vue !! Unexpected power steering loss

Quote:
Originally Posted by kevev View Post
Was the Vue ever fixed? On my 3rd bcm and having exact issue.

No CEL light so no codes.
You can still have codes without the light on. The CEL (Check Engine Light) is just that, check engine, related to all things drivetrain. BCM is the electrical system. So it is worth checking with a scanner that can read ECM/BCM. Call around, some shops will scan at no charge. Never know what you might find. Typically though, you would see a Service Vehicle Soon light on the dash. I will not pretend to be anything remotely close to a mechanic, I'm just throwing out ideas for you, from my own experiences.

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