MPLAB ICD 4 Help

Indicator Lights (LEDs)

The expected start-up sequence for the MPLAB ICD 4 debugger is:

1.	Purple - steady on for approximately 3 seconds.

2.	Blue - flashing for approximately 2 seconds while the debugger runs a power-on self-test.

3.	Blue - steady on. The debugger is ready.

The following table advises how to read the indicator lights.

Table: LED and Bootloader Error Descriptions

Left LED	Right LED	Description
Normal Modes
Blue	Blue	Power is connected; debugger in standby
Orange	Blue	Power target circuit from ICD 4 checked (Table: Power Option Category)
Green	Blue	Power target circuit from ICD 4 unchecked (Table: Power Option Category)
Purple	Purple	Bootloader is running
Yellow	Yellow	Debugger is busy
Red	Red	An operation has failed
Purple	Purple	Fast blink indicates the time window for forcing the debugger into Bootloader mode
Bootloader Errors
Purple	Red, slow blink	Problem accessing the debugger’s serial EEPROM
Purple	Red, fast blink	Bootloader API commands cannot be processed
White, fast blink	White, fast blink	A runtime exception occurred in the tool firmware

Microchip Support Help Updated: 2019-06-25 10:29:54Z Help Page: 67