How to obtain SugarBean from a relate field?

Hi All

I am working in Cases After Save logic hook and need to get a bean from a relate field. I have a relate field named vehicle_c which is related to a custom module called Vehicle. 

When I log the the field below in sugarlog I seem to get the title of the record but I want to access other fields in the record like VIN  (vin_c).

Any ideas on how I can achieve this?

$GLOBALS['log']->fatal(__METHOD__ . " LOG NAME :::: ".$bean->vehicle_c); // This seems to log name of record.

$GLOBALS['log']->fatal(__METHOD__ . " LOG NAME :::: ".$bean->vehicle_c->id); // This logs nothing