Far passenger side of the firewall, behind the air cleaner.
Powertrain Control Module
Powertrain Control Module (PCM)
PCM powertrain control module is located on the firewall on the passenger side. it has 3 large wire connectors.
in glove box
The powertrain control module, is located on drivers side under dash, it is white!
A 1997 Wrangler doesn't have a BCM. (body control module) It does have a PCM (powertrain control module) which is behind the battery.
The powertrain control module is one of the electronic control modules used on a vehicle. Others include antilock brake, airbag, transmission, body,
The voltage regulator is controlled by the powertrain control module and it is located on the passenger side firewall on most Dodge 3500 diesel. This is a problem that some people fix by installing an external voltage regulator.
The ecm or engine control module aka powertrain control module is located on the floor under the dash. You can pick up used ones on ebay...
Powertrain control module
Powertrain Control Module
if you have not found it yet mine was under the dash between the clutch pedal and the parking brake good luck