The ground for the lamp in the steering wheel control is wrong. It doesn't pass through the clock spring and it's grounded behind the passenger seat..
No schematic I have seen yet shows the clock spring as being in the ground circuit.
@TomatoSoup
I thought you would have caught that one.
There are lots of cases in the vehicle where wire color changes or the diameter of the wire changes when there is an inline clip involved. If you have the monsoon audio system the wire diameters are larger then the base audio system but only for the IP harness not the door harnesses. The door harnesses are 0.8mm in sectional area and with the monsoon system the door speaker wires are 1.0 mm in sectional area. The base audio system is 0.8mm in sectional area for the front speakers in the IP harness and also in the door harness.
As you can see in the image above the interior lighting wire color changes from Gray/Black to Gray once it passes through the clock spring. The ground for the LEDs in the steering wheel controls is not shown as passing through the clock spring and is grounded behind the drivers seat. How how did that wire manage to get down the steering column without passing through the clock spring.
This is where it gets really interesting. I have the pinouts and wire information for each and every clip in the vehicle as well. The X1 clip and the X2 clip are the designations for the clips on either side of the clock spring. Neither one has a ground wire that is black/white, only a black wire is shown.
I pulled the schematics for the IPC, Horn, Interior lights, Radio, Airbags and the Ground Distribution. Finally a schematic that shows what is going on. Only one of them shows the splice point in the steering wheel as there must be one because the horn, left SWC and right SWC all need to be grounded. But even the one with the splice point doesn't show the same wire colors as what is seen in the pinout for the clips that plugs into the clock spring.
Now if memory serves the splice point is actually not a splice point at all. It is a ground point where the wires are screwed down. This is done because of how the horn switch is made. I believe the wire that runs from the screw to the clock spring clip is in fact black while the rest are black/white. NO schematic shows this.
Here are the pinouts for the steering wheel controls and the clock spring.
This is the IPC diagram. Here they really messedup as no clock spring is shown at all even for the signal wire going from the SWC to the IPC
This is the cruise control diagram. At least this one shows the ground going through the clock spring but pay attetion to how the attachment for the SWC is made. At the horn.
Here it shows all the grounds but also a junction/splice. No information is given for that splice. J235
See how the splice is off the second wire that is attached to the horn? That second wire is a terminal ring that has both SWC grounds attached to it. there is another terminal ring on the wire that going to the clock spring. These are screwed down to the backing plate for the horn. I think the piece of wire that runs between the backing plate for the horn and the clock spring is in fact black.
. but in my defense (and GM's) I think that's why it's shown as a dashed line. In my schematics, the backlight LEDs show a solid line ground through the clockspring. Pretty much everything else shows a dashed line direct to ground.
