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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Chevrolet: unknown driver fault. Reading forums it looks like

Customer Question

unknown driver fault. Reading forums it looks like its a splic/jumper inder the dash. Wondering if you can tell me exactly where it's located?
Submitted: 2 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 2 years ago.
Hi there, I am Cam. Did they specify the network splice or a ground splice? IF the network splice, those are in the big harness that runs up from the data plug.
Expert:  GM Tech (Cam) replied 2 years ago.
#3 in the picture is the splice pack.
Customer: replied 2 years ago.
Before we go there, have you delt with this issue before? I want to be sure I'm going down the right path.
Expert:  GM Tech (Cam) replied 2 years ago.
I have with others. that splice pack is VERY easy to get to.
Customer: replied 2 years ago.
According to the forum, it's the class 2 serial data wires at the splice pack connector sp205 (a 12 pin connector under the dash to the left of the BCM ( whatever that is).
Expert:  GM Tech (Cam) replied 2 years ago.
Yes, that is the splice I am thinking of. The BCM is directly under the steering column and that trim panel needs to be removed. 2 7mm screws then the top pops out. You will see the Body Control Module (BCM) there. Then to the left of the opening is a large harness and the spice packs are taped int here. See the diagram attached.
Customer: replied 2 years ago.
Where is it in relation to the brake pedal?
Expert:  GM Tech (Cam) replied 2 years ago.
Slightly left and towards the driver. If you follow the purple wire out of the data plug, it wi take you right there.
Customer: replied 2 years ago.
I'm sorry - I'm a handy guy but not an experienced auto mechanic. What/ where is the data plug you are referring too?
Customer: replied 2 years ago.
Can you call me on my cell?
Customer: replied 2 years ago.
Is the data plus on the firewall by the relays?
Expert:  GM Tech (Cam) replied 2 years ago.
Do you see the plug beside the parking brake release under the dash left side? It's where the scanner plugs into.
Customer: replied 2 years ago.
Yup
Expert:  GM Tech (Cam) replied 2 years ago.
That is the plug. It had 4 wires. One is purple. Follow that up.
Customer: replied 2 years ago.
Found the pure wire What's the trick to get access to that area.
Expert:  GM Tech (Cam) replied 2 years ago.
It's a pain, I won't lie to you. Taking that panel off I mentioned, then follow it up. Use a knife to carefully expose the wiring and inspect those splices. See if there are any signs of water, corrosion, cut wires, see if anything is installed like a remote starter, security, radio and that sort of thing.
Customer: replied 2 years ago.
I'm sorry - what panel are you referring too?
Expert:  GM Tech (Cam) replied 2 years ago.
It's the plastic panel that your knees will hit directly above that plug.
Customer: replied 2 years ago.
Ok. Understand. Have you worked on this problem before? Just wondering if I'm on a wild goose chase or not.
Customer: replied 2 years ago.
Symptoms: insert key, display says unknown driver. Power windows, locks, radio eats doae not work. Starts but shuts down in a few seconds.
Expert:  GM Tech (Cam) replied 2 years ago.
I have worked on this problem before, but I cannot simply say " do this". to have it shutting down, showing that message and acting as it is usually is a Body Control Module (BCM) which is under the dash below the steering column or a network issue, which is branched off from the splice pack I was sending you to and where the forum sends you do. the Body Control Module (BCM) controls security, its the power mode master which means it turns on the devices and it remembers the preferences of the drivers. SO we need to expose that wiring to the network and proceed in checking that next.