Using my Maxicheck Pro, how do you know which letter codes to select for the BODY and CHASSIS letter codes required by the Maxicheck Pro for a Brake Bleed function? I have a 2003 Pontiac Bonneville SLE 3.8 engine (non-supercharged). An Autel Tech told me that it was the 5th digit in the VIN ID. This does not appear to be right as the BODY letter "Y" for the Bonneville results in a 2-door vehicle instead of a 4-door.

Tags: ABS , Brake , Bleed , Body , Codes , Chassis , Codes , PRO