Wed Feb 4, 2009 From: john looking through the wiring diagram listing of Junction Blocks I see the following "modules" on the '99 WJ: Automatic Zone Control Module Body Control Module Driver Door Module Engine Control Module Passenger Door Module Power Distribution Center Powertrain Control Module Remote Keyless Module Seat Module Sentry Key Module Sunroof Control Module Transmission Control Module United Kingdom Security System Module Vehicle Information Center Not sure if that is all of them, but I can vouch for three computers required for seat heaters... :) Power Dist Center, Seat Module and Body Control Module... I found one a useful link on wjjeeps.com (involves later models): http://wjjeeps.com/modules.htm they list: 1. BCM - Body Control Module 2. PDM - Passenger Door Module 3. AM - Airbag Control Module 4. MIC - Mechanical Instrument Cluster 5. EVIC - Electronic Vehicle Information Center 6. CAB - Controller Antilock Brakes 7. TCM - Transmission Control Module 8. SKIM - Sentry Key Immobilizer Module 9. HSM - Heated Seat Module 10. MHSM - Memory Heated Seat Module 11. DDN - Driver Door Module 12. PCM - Powertrain Control Module 13. SM - Sunroof Module 14. RSM - Rain Sense Module 15. APM - Adjustable Pedals Module ----- ------------------------------------------------------------------------ Snohomish, Washington -o|||||o- where Jeeps don't rust, they mold http://AMSOIL.com/redirect.cgi?zo=283461 http://freegift.com http://johnmeister.com/tmcp.pdf http://wagoneers.com/fotos ------------------------------------------------------------------------