LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Security And Locks - Keyless Access (W/ Push Button Start) (Diagnostics) >> Control Module I/O Signal >> Electrical Specification >> Id Code Box
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Id Code Box

Fig 1: ID Code Box Terminals
G08585637Courtesy of SUBARU OF AMERICA, INC.
Terminal No. Terminal symbol Contents
(B422) No. 1 +B +B
(B422) No. 2 LIN LIN communication
(B422) No. 4 IMO1 Immobilizer communication 1
(B422) No. 5 GND GND
NOTE: Disconnect the control module connector before checking the following items.
Terminal No. Standard Measuring condition Item
1 (+B) ←→ 5 (GND) 10 - 14 V Always Voltage
4 (IMO1) ←→ 5 (GND) 0 V Ignition OFF Voltage
5 (GND) ←→ Chassis ground Continuity exists Always Continuity
NOTE: Connect the control module connector before checking the following items.
Terminal No. Standard Measuring condition Item
4 (IMO1) ←→ 5 (GND) 0 V Ignition OFF Voltage
4 (IMO1) ←→ 5 (GND) Waveform 1 Ignition ON Voltage

Waveform 1

Fig 2: ID Code Box - Waveform 1
G11581719Courtesy of SUBARU OF AMERICA, INC.
Item Contents
Measured terminal 4 (IMO1) ←→ 5 (GND)
Equipment setting 5 V/DIV, 100 ms/DIV
Measuring condition Ignition ON
scientia non olet · About LEMON Manuals