KAT/docs/kia_v5.md

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Kia V5 Protocol

Rust module: src/protocols/kia_v5.rs
Reference: REFERENCES/ProtoPirate/protocols/kia_v5.c

Overview

Kia V5 uses Manchester encoding at 400/800 µs with opposite polarity to V1/V2: level true → ShortHigh, level false → ShortLow. 64 data bits + 3-bit CRC (67 bits on air). Preamble: 40+ short/long pairs; then LONG HIGH (sync), SHORT LOW (alignment), then Manchester data. Counter is encrypted with a custom mixer cipher using the KIA V5 key (YEK); serial/button from YEK.

Timing

Parameter	Value	Notes
Short	400 µs	±150 µs
Long	800 µs	±150 µs
Min bits	64	(+ 3 CRC)

Encoding

Manchester with V5 polarity (level ? ShortHigh : ShortLow).

Frame Layout

• Preamble (40+ pairs) → sync (long HIGH) → alignment (short LOW) → 64 Manchester bits → 3 CRC bits.
• 64-bit key (YEK) = bit-reverse of stored value; serial/button/counter extracted from YEK; counter half is mixer-decrypted with keystore V5 key.

Decoder Steps

1. Reset — Wait for preamble.
2. CheckPreamble — Count pairs; detect sync and alignment.
3. Data — Manchester decode 67 bits; extract YEK, mixer-decode counter, validate CRC.

Encoder

Decode-only in KAT (reference has encoder under ENABLE_EMULATE_FEATURE).

Frequencies

433.92 MHz.

Keystore

Requires KIA V5 mixer key (keystore type 13, kia_v5_key). Used for mixer decryption of counter.