A typical Electronic Control Unit(ECU) performs Open Circuit(OC), Short to Ground(STG), and Short to Battery(STB) Diagnostics on selected internal and external pins in the ECU.

For example, consider a external output pin.  There is a wire connected from this pin to somewhere else.  If this wire is cut, software will detect OC fault.  Or if the output impedance reaches OC threshold, software will detect OC fault.

For some Automotive Advanced Drive Assist System(ADAS) ECU, one Original Equipment Manufacturer(OEM) requires supplier to implement software and hardware to detect OC, STG, and STB faults on all external Digital Outputs and PWM Outputs.  They also require supplier to detect these faults on all internal Serial Peripheral Interface(SPI) busses.  What might be the reason for selecting these pins for fault detection?  Why not some other pins?  Maybe fault detection is required on these pins to meet some safety standard?

Consider a Level 2 Autonomous Camera ECU and Radar ECU that support features such as Lane Departure Warning(LDW), Adaptive Cruise Control(ACC), Automatic Emergency Braking(AEB), etc.

What internal and external pins in Camera and Radar ECU should be detected for OC, STG, and STB faults and why?

• Camera has no external input pins
• Within camera is Low Voltage Differential Signaling(LVDS) interface.  It's from imager to SOC.  The pins are as follows:
  • LVDS+
  • LVDS-

• Radar has no external input pins