OnStar control module (673)
| OnStar control module (673) | 
| Manufacturer: | OnStar | |
| Number of pins | K12 K16A K16B | 12 16 16 | 
| Location | 4D 5D | Beneath the parcel shelf Luggage compartment, right side | 
| Power supply +30 | pin No. | 15, 16 (K16A) | 
| Ground | pin No. | 7, 8 (K16A) | 

 
     
		