Lucas 5AS

Reverse-engineering notes for a Lucas 5AS immobiliser.

Sources:

• Andrew Revill
• James Portman
• Blackbox Solutions

Sections

• Hardware & Pinouts — connector specs, J1/J2 pinout tables, OBD wiring
• Diagnostic Mode — 5-baud setup, test commands, data packet
• EEPROM Protocol — read/write command format and byte 0 bitfield
• EEPROM Map — full memory map with field descriptions