CODE 45-1 (Initiator circuit short detected)
A TPMS initiator is mounted in each wheel well.
To help isolated the problem let the air out of each tire till the low pressure light goes on, then refill the tire and moved on to the next wheel.

The following APPLIES TO: All models with initiator-less and initiator-type TPMS. When doing sensor ID learning, make sure you keep at least 10 feet of clearance between the tire pressure sensors you're trying to learn and other tire pressure sensors nearby. Those sensors can be on any TPMS-equipped vehicles, loose TPMS-type wheels, or just other loose tire pressure sensors (including any in your pocket).