Operation - Ignition Circuit Sense

When the ignition key is inserted, the position of the key is transmitted via the CAN bus to Integrated Power Module (IPM). When the key position is rotated to the ACC position or Run/Start position, the IPM energizes the Ignition ACC and/or Run/Start feed which will wake up the Powertrain Control Module (PCM) accordingly. These feeds are essentially fused switched battery voltage feeds fabricated by the IPM with relays or solid state devices. There is not Ignition Start feed to the PCM - this is handled by a CAN bus message from IPM to PCM. NOTE: Only on those applications with the 42RLE does the PCM receive an Ignition ACC feed.