ION L4-2.4L (2007)
Diagnostic Aids
The engine will not start when there is a total malfunction of the GMLAN serial data circuits while the engine is not running. The following conditions
may cause a total loss of GMLAN data communication:
* Any of the serial data circuits shorted to ground
* Any of the serial data circuits shorted to voltage
* A short between serial data circuits
* An internal malfunction of a module on the GMLAN network that causes a short to voltage or ground
Test