I just had the sclm stop working after redoing sone under carriage and torque tube work. Battery was disconnected while work was progressing. It was on trickle charge. Car starts but still on lift when i noticed steering was not locked.
i pulled the fuse marked as steering col lock but hot no response.

anyone know how to get this lock to re-engage as o it functions properly. Does the BcM need to be re-flashed?

 

As mentioned you should not have a functional column lock if your model year is after 2005…as you can see on my 2008 the module is “grayed” out so it will not communicate…the module is not present…don’t know what to tell you !!..if you have a factory level scan tool can you screenshot that you can communicate with that module ??

 

I think its time to get a scan tool that can re-flash the bcm and get to the fix quicker. Got any recommendations?

The car is on a lift in our garage having work done so before i bring it down and can drive it i need to fix this it. The service manual says the bcm can enter a fail enable mode and prevent column locking and the PCM will disable fuel to allow driving. Sec 15-87. To clear it disconnect fuse #25 for 15 seconds.


The bcm had no fuse id marked #25.
the only 25 in the whole car is a fan fuse in the engine grouping.

no one seems to know about this specific fuse 25 nor its location. Anyone?

 

Can you take a picture of this service manual procedure ??…I have no idea what you’re looking at.

 

Listen to C5 DIAG, there is not an SCLM in your 2010 GS. The column does not lock. Does your car start? If so, then your fuel is not being disabled either.

 

Gentlemen, After owning 13 vettes i can tell you without question this grand sport has a column lock capability and fuel cutoff as part of the security features
we have complete GM service manuals on each car. The 2010 grand sport has 4 exclusive volumes covering everything on that 2010 and only that one.. They are pretty good for both Grand Sport manual and automatics.

the following is just one section that mentions Column locking problemsSCLM) :there are many references on various parts on the manual. Warning: Refer to SIR Warning on page 0-o.

1. Disable the SIR system. Refer to SIR Disabling and Enabling on page 13-88.

Note: If the steering column connectors are disconnected with the ignition in the ON position, the BCM will enter a fail enable mode and prevent steering column lock operation. The PCM will also inhibit vehicle motion by disabling fuel. To clear the BCM fail enable mode, disconnect the BCM fuse #25 for 15 seconds.

1. Remove the upper and lower steering column trin covers. Refer to Steering Column Trim Cover Replacement (Telescoping) on page 15-68 or Steering Column Trim Cover Replacement (Manual) on page 15-70.
2. Remove the wire harness straps (2) from the tilt head assembly (1) and the column.
3. Install J 42640 to the steering column.
4. Remove the tilt head assembly. Refer to Steering Column Housing Replacement (Manual) on page 15-92 or Steering Column Housing Replacement (Telescoping) on page 15-95.
5. Remove the steering wheel theft deterrent

The SCLM located on behind the dash clipped to the steering column support frame

 

I thought column lock was an c5 and 05 only thing too... I know my GS doesn't lock nor has it ever.

 

i know GM had some earlier problems either them but mine was built 3/10/10 and it definitely has it. What year is your GS? It seems there may have been a switch over. Did you buy new? Or did you buy from maybe someone who bought the lock eliminator module and installed it without telling you.
Look on-line and you’ll see those modules run about 60-70$. I know some guys had a problem with columns locking up and wound up not being able to love the car so rather than pay $400 for a new GM module they opted to install a by-pass which would be located where the SCLM was installed behind the dash-panel instrumentation section.

 

WOW. If this is true then GM must have brought back the column lock after several years of absence. My '08 does not have it. sorry to have mislead you.

 

These are your BCM powers and grounds which should be in your manual…no BCM Fuse 25…there are 2 “BATT” or battery fuses and that’s it and they are underhood so they are numbered…as I mentioned see if your shop can communicate with the SCLM with their scan tool…if they are a repair shop they should have something a little better than a “code reader”…if your column lock is not working there should be a troubleshooting flow chart in your manual for that.

 

This is in ALLDATTAdiy for a 2008 A6 base model.

Steering Wheel Theft Deterrent Lock Operation

The steering column lock control module (SCLCM) controls the steering wheel theft deterrent lock function, which allows the column to be electronically locked. The SCLCM controls the column lock motor using an internal lock relay, an internal unlock relay, and an internal lock enable relay. The lock and unlock relays provide a low input to the column lock motor. When the column needs to be locked the lock enable relay will energize the lock relay, which provides a high input to the lock side of the motor, energizing the motor to lock the steering column.
In order for the steering column to be locked the SCLCM has to see 3 inputs. The first input the module needs to see is the vehicle in the park position (automatic transmission shift lever). When the shift lever is in the park position, the switch internal to the automatic transmission shift lever closes sending a high input to the SCLCM and the body control module (BCM). When this occurs the lock relay (internal to the SCLCM) is energized closing the lock relay switch.
The second input to the SCLCM is the ignition state. The remote control door lock receiver (RCDLR) and the BCM look at the power mode. When the ignition 1 input is in the off state or RAP mode, the RCDLR sends a class 2 message to the SCLCM indicating this state which will lock the column.
The third input the SCLCM receives comes from the BCM enable relay. When the BCM goes to the off power mode then the low input is sent to the SCLCM.
When the SCLCM receives this low input from the BCM the internal lock enable relay is energized and provides a high input to the lock side of the column lock motor. The unlock side of the column lock motor is grounded through the internal unlock relay within the SCLCM. The column lock motor will send an input back to the SCLCM indicating the motor is energized for the locked position. This results in the locking of the steering column.
The SCLCM will unlock the steering column if the power mode is on and the SCLCM and RCDLR passwords match.
The SCLCM monitors the column lock system and will set DTC codes when the module detects malfunctions within the system. When a malfunction occurs the driver information center (DIC) will display the Service Column Lock Now message indicating DTC codes are set within the SCLCM.

 

can you see what power fuse actually feeds the BCM.
i’m on the hunt. Without tearing into the BCM i would bet there may be smaller boards actually fed by different fuses the BCM is really a system organizer of different features so thsdt may be possible.
someone told me there are multiple fuses.
This is one of the few times rhe service manuals don’t appear to be correct. Juries out for nowg

 

Export C6's have the column lock in later modules than the 2005.

So if car does have a Steering column lock in play, including SCLM, then car was export, that made is way back into the states.

Since the system is a nightmare, and GM no longer has the parts, then need to get dealer to get A/C delco on the phone, ac delco to write write a VIC file to delete the system in the later year car, and dealer can pull that VIC file by it number, to reflash the BCM to remove the system from being in play.

And for the love of Christ, do not flash the BCM with the none export version of the current BCM firmware file if car is export modle.
Hence during flash with Vin number, car should come up as export(if it is), TDS will pull that esport file, but since it does not have the SCLM delete like the current USA 2005 BCM to delete the system, A/C delco will need to mod the the BCM export file, to add in the needed sclm system delete instead. During flashing you have one of two options, and that is the normal method that pulls up the current file, and then the VIC method, where AC delco mods the file to be on that vin, and its pulled up from there using the VIC number (and not, you can not use a VIC number for a different car, since its locked to that vin number only). also while they are doing the flash, will need to do the tsb 18-NA-346 at the same time.

https://static.nhtsa.gov/odi/tsbs/2018/MC-10155118-9999.pdf

As for sclm, and the column lock itself, most of the time on the SLCM, it a corrosion problem between it connector to the module, or down at the BCM connector (on data port, through 205 and 206 splice blocks) isntead.
I state most of the times, since it possible to wear out one of the Relays on the SCLM as well.

As for column lock itself, your should be the cable type, not the ribbon type that would crack to cause problem, and the gltich with the locks, is they have plastic grease that start to bind up over time. Hence lock has it main power wires, then two other wires that gives resitance values back to SCLM, to tell the module if lock is in the locked postion with shaft all the way out, or if shaft is all the way back in instead. So the two restance values are 470ohms locked/297 unlocked, and will be Zero reading if rod is not all the way out, or all the way in. Also, if lock does not fire fast enough (binding gear), then SCLM will fault as well.

Note here, if battery is low, or SCLM is not getting at least 12 volts, then module will not fire the lock fast enough, to case the fault as well. So if battery was low, disconnect the battery cables from the batttery, put battery on charger to top battery off, touch the battery cables to each other away from the battery to discharge all the modules in the car to hard reset them from low voltage glitching, then reconnect the battery. I bring this up, since battery may have been drained down when work as being completed, and problem alone may be just a low voltage glitch problem, that hard resetting the modules may solve the problem,

Somethings you can pull the column lock apart to clean and re-grease the plastic gear assembly to solve the problem, while most of the time, the plastic drive gear is just torn to hell from the motor steel drive gear, that has the rod moving too slow for the module before it fault times instead.

And if you want be sure that system has SCLM and lock in play on the M6 trans car, then pull the speedo cluster, and will be able to see not only the SCLM that will be back right, but the cable that comes off the module and goes to the lock (again, should be cable, unless it when out before, Dealer had New old stock of locks with ribbons, and that is what was used, ribbon has cracked from age itself.

If car is not an export, but was USA model all along/ never converted to export with steering column lock, then should not have oem steering lock system in it, and the problem is the BCM firmware that was wrongly flashed as some point to make BCM think that lock system was in play, or just low voltage glitch problem that module hard reset via battery disconnect/cables touched to each other away from battery, should resolve.

Also, the A6 cars did not come with the SCLM system, only the M6 cars (2005 only for USA model, and onward for the M6 export cars).
So on that note, if car is A6 export), use tech2win to go into BCM set up programming, and make dam sure that trans type is set auto, and not manual that would tripping the sclm problem with export car in the BCM looking for something, that is not there...

 

And going to add, if BCM set up programing is all screwed up, pull up BCM data, pull up ECM data, and pull up IPC data, to make sure that all the vin numbers match to title vin number/dash vin, and your not in the possession of stolen car with vin swap. Hence firmware flashing to car is all done by vin number, and if vin rpo's are not matching to the car RPO's itself the way it left the factory . then something very suspect with car itself.

 

can you see what power fuse actually feeds the BCM.
i’m on the hunt. Without tearing into the BCM i would bet there may be smaller boards actually fed by different fuses the BCM is really a system organizer of different features so that may be possible.
someone told me there are multiple fuses.
This is one of the few times the service manuals don’t appear to be correct. Juries out for now.

 

Does your RPO code sticker on the glove box have a code of MAE? Export for Europe.
This figure shows where the Column Lock Module is located to visually see if your car has it installed.

 

I posted powers and grounds so if you have the factory manual you can look in the electrical section and look since I'm using Alldata for my source...modules normally have an ignition (wake up) and a battery feed (memory)...before you go crazy with this thing and knowing it was working fine I'm assuming before the work just do the easy stuff...a good battery, any trouble codes and good module communication...don't worry about pulling fuses...reflashing the BCM...keep it simple…and as posted check the 3 inputs especially the transmission…you can check inputs to the module with a scan tool…sometimes a module will supply a ground and sometimes power…if you can read a wiring diagram you can interpret this.

 

i watched this car being built in bowling Green for my delivery. The Eu models have very different wiring harness and headlight washers. Side maker among other things. Its not designated as EU build.

I think after driving, owning and maintaining this car for 15yrs since it was created i would know when the car isn’t acting or sounding right.. i can say that col lock just stopped working a little more than a couple days after we killed the main battery connection. Never had this problem before.
While we've done disconnects before but never did as long as this time which apparently dumped the stored memory of in the SCLM may have cause the issue.

BCM or SCLM scan may be the path next