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Can someone explain me how it works? Here is the picture of the mod described on many sites.
_____________ _______________
| | | |
| OnStar Main tx|---------------> | OnStar GPS |
| Board |<-------------- | Module |
|_____________| ^ |_______________|
| |
| |
| |
________v____
| tx |
| CarPuter |
|_____________|
Not a single website tells to disconnect TX line between Onstar Main Board and OnStar GPS module. Therefore both CarPuter and OnStar main board will be driving the same line at the same time. My guess Carputer overpowers OnStar. However sooner or later something will break.
Thanks.
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