In the ISO 11898 CAN bus standard, what is the dominant voltage differential between CAN-High and CAN-Low on a typical high-speed automotive bus?
Can Bus
Question · Medium
Which ISO standard defines Unified Diagnostic Services (UDS) used by modern OEMs for secured key programming?
A K-line (ISO 9141/KWP2000) diagnostic interface operates at what logical voltage level idle?
On OBD-II (J1962) connectors, which pins carry high-speed CAN?
Question · Easy
What is a 'gateway module' in a modern vehicle network, and why does it matter to a locksmith?
UDS service 0x27 (SecurityAccess) functions by which mechanism?
Question · Hard
When troubleshooting a 'no communication' fault at the OBD port, the first electrical check a CMAL should make is:
CAN bus termination in an automotive high-speed network uses what resistor values?
Mode $09 PID $02 is used to read what information from an OBD-II-compliant vehicle?
Which diagnostic trouble code (DTC) family is specifically assigned to body/immobilizer systems?
FlexRay (ISO 17458) is used in some premium vehicles (BMW, Audi). What is its key distinction from CAN?
Automotive Ethernet (100BASE-T1 / IEEE 802.3bw) over a single twisted pair is increasingly used as the backbone diagnostic bus. Typical use case relevant to locksmiths:
A CAN frame captures ID 0x7E0 followed by 0x7E8 on the bus. What is this sequence?
When a CMAL sees a B1600 'PATS ignition key out of range' DTC on a Ford, the typical cause is:
Why must a CMAL clear transport mode before programming keys on a new or shipped VAG MQB vehicle?
BDM (Background Debug Mode) on a Motorola/Freescale MCU provides what capability to a locksmith?
Eeprom
The 93C46 is what kind of memory chip commonly found on instrument clusters and immobilizer boxes?
A 95040 EEPROM on a BSI module from a late-model Peugeot/Citroen holds which locksmith-critical data?
25320 / 25160 series chips differ from 93-series chips by:
Motorola 68HC05 / 68HC08 / 68HC11 MCUs commonly contain on-die EEPROM. Locksmiths read them via:
NEC D70F3xxx MCUs are found in which common immobilizer system?
The Renesas R8A series is commonly found in which modules?
PCMCIA-style Mercedes EIS modules from the W203/W211 era stored keys in which chip family?
VIN extraction from a BCM EEPROM dump is most valuable when:
Fujitsu MB90F-series MCUs appear in which immobilizer system, and how are they typically read?
J-TAG (IEEE 1149.1) provides what capability relative to BDM?
Before reading an SOIC-8 EEPROM in-circuit, you should ensure:
When an EEPROM dump shows the immobilizer PIN but also a checksum field, what must the CMAL do before writing back?
A Motorola 9S12 MCU is secured. What is the standard recovery procedure to access EEPROM?
Which tool set is specifically known for reading secured NEC 76F00xx MCUs used in Mercedes W204 ESL and Renault UCH?
The 5th-generation BMW FEM/BDC immobilizer cryptography uses which algorithm?
Cryptography
Hitag AES transponders (used in many 2015+ VAG, Ford, and Fiat vehicles) use what key length?
The DST40 (Texas Instruments Digital Signature Transponder) was broken by researchers at Johns Hopkins primarily via:
DST80 (Texas Crypto 3, 80-bit) was found vulnerable in 2020 by Garcia/Oswald — the key weakness was:
Megamos Crypto (Hitag cousin, older VAG/VW) was broken by Verdult, Garcia and Ege (2013) via:
Which transponder family is used in Toyota smart-key vehicles post-2015, and why is it difficult?
A 'collision attack' on a transponder cipher refers to:
The Hitag2 cipher is considered:
A 5th-generation immobilizer on a 2022 Audi Q5 MQB+ typically requires what to program keys?
For cryptographically secured modern systems (AES-128), the practical attack vector for a CMAL is:
The BMW transition from EWS to CAS occurred roughly in which model years?
Oem Master
BMW CAS3+ vehicles (E90 2007.5+) require what programming method for an all-keys-lost?
BMW FEM/BDC key programming without pulling the module is:
Mercedes W204/W212 use which immobilizer, and what is the standard locksmith flow for AKL?
'ESL renewal' on Mercedes means:
Porsche PIWIS is what, and why does a CMAL care?
VAG MQB component protection means:
Hyundai/Kia Pin Code algorithm on 2013+ smart-key vehicles is derived from:
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