Circuit Description

PCM Quad Driver Module provides 4 switchable ground outputs for operating solenoids, relays, warning lights, and other devices. Each of these ground outputs has an internal fault line that feed back to the PCM. When the output is off, the quad driver should receive 12 volts fed to the solenoids, relays, etc. When the output is on, it should receive zero volts, since it is grounding the output. If it receives zero volts when the output is off or 12 volts when the output is on, it sets the fault line low. DTC is used to monitor the fault line of the cooling fan control relay output.