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onstar: Refine Onstar sections after further analysis

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Alexander von Gluck IV
2022-01-20 20:07:06 -06:00
parent 3b1d933695
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@@ -13,16 +13,11 @@ OnStar is a built-in 4G LTE-based data service which also lets you make phone ca
Every Bolt EV comes with at least 5 years free of "EV Mobile Command". This lets you control the car, and see battery state of charge through the built-in 4G LTE modem.
#### OnStar API 8-request Lockout
### OnStar Instability
After 8 requests for diagnostic information (battery state of charge, charging status, etc), you are no longer allowed to query this information until your vehicle is physically powered on again.
OnStar in 2017-2019 Bolt EV's has a habbit of going into periods of failing to serve requests for diagnostic information.
> This was tested from the 5-year free "EV Mobile Command" package. It is possible this limitation doesn't apply to paid OnStar plans... but hasn't been tested yet. GM doesn't document any of this.
This was discovered via [onstar2mqtt](https://github.com/michaelwoods/onstar2mqtt/issues/103).
Onstar2mqtt will request diagnostic health once per hour, after 8 hours it begins failing with "error: Error" from Onstar.
Powering on your vehicle will allow functionality to resume.
The end result is the battery SoC stops refreshing in the myChevrolet application, and API calls (for example via [onstar2mqtt](https://github.com/michaelwoods/onstar2mqtt) stop functioning until the vehicle is physically powered on again.
**Observations:**
@@ -32,6 +27,32 @@ Powering on your vehicle will allow functionality to resume.
* Plugging vehicle into a Level 2 charger - get_diagnostic request still failing
* Getting into vehicle, powering car on - get_diagnostic requests working again
After extensive trial-and-error, there doesn't seem to be a fixed set of conditions leading to this event. There also is no fix beyond physically powering the vehicle on via the start button.
### Disabling OnStar
OnStar can be disabled by powering the vehicle off (important per the repair manual, it has a battery) and pulling the OnStar fuse from the fuse panel under the drivers steering wheel.
Once disabled, [a blank filler plate](https://thingiverse.com/thing:5199130) can be 3d printed to replace the physical OnStar buttons.
Overall, the vehicle works as expected with the OnStar module disabled except for one problem. The in-vehicle microphone for bluetooth telephone calls will no longer function.
The microphone runs through the OnStar unit which seemingly amplifies or re-encodes the audio signal for the radio.
It might be possible to "bridge" the microphone directly to the radio unit via the following pins of OnStar X2 connector:
* 9 B24 Cellular Phone Microphone +
* 10 B24 Cellular Phone Microphone ground
* 6 Radio / Navigation Microphone +
* 12 Radio / Navigation Microphone -
* 5 Radio / Navigation Microphone ground
Connecting 9/10 to 6/12 might provide a functional in-vehicle bluetooth audio experience. Untested.
### Physical Access to OnStar module
The OnStar module (K73 Telematics Communication Interface Control) is physically located directly behind the central infotainment screen.
Access is not easy as you will need to remove the dash trim (containing the AC vents), then unscrew and remove the infotainment screen assembly.
## Dealer TechLink
* [How to fix the Bolts tires](https://techlink.mynetworkcontent.com/wp-content/uploads/2018/03/GM_TechLink_05_March_2018.pdf)