LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics) >> Control Module I/O Signal >> Electrical Specification >> KEYLESS ACCESS Control Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

KEYLESS ACCESS Control Module

G13264972Courtesy of SUBARU OF AMERICA, INC.
Terminal No. Contents Measuring condition Standard
(B573) No. 1 (+B2) ↔ Chassis ground +B power supply (SUB) Always (1) 9.5 V - 16 V
(B573) No. 2 - - -
(B573) No. 3 - - -
(B573) No. 4 (+B1) ↔ (B573) No. 20 (GND1) +B power supply (MAIN) Always (1) 9.5 V - 16 V
(B573) No. 5 - - -
(B573) No. 6 (TACH) ↔ Chassis ground Engine speed While engine idling Waveform 2
(B573) No. 7 (SPD) ↔ Chassis ground Vehicle speed input Always 30 kΩ or more
(B573) No. 8 (SSW1) ↔ (B573) No. 20 (GND1) Start switch input 1 Push button ignition switch released → pressed(1) Less than 1 Ω→ 10 kΩ or more
(B573) No. 9 (SSW2) ↔ (B573) No. 20 (GND1) Start switch input 2 Push button ignition switch released → pressed(1) Less than 1 Ω→ 10 kΩ or more
(B573) No. 10 (SLR+) ↔ Chassis ground Steering lock motor power supply signal output Always (1) 10 kΩ or more
(B573) No. 11 (SLP) ↔ (B573) No. 20 (GND1) Steering lock position input With ignition switch OFF and shift position P, and with push button ignition switch pressed, Steering lock → Steering unlock 9.5 V or more → 1.2 V or less
(B573) No. 12 (INDW) ↔ (B573) No. 20 (GND1) Indicator output (orange) With ACC ON or IG ON, brake pedal not depressed. 9.5 V or more
(B573) No. 13 - - -
(B573) No. 14 (CLUT) ↔ Chassis ground Clutch switch input Clutch pedal depressed → Released 9.5 V or more → less than 1 V
(B573) No. 15 - - -
(B573) No. 16 (ACCD) ↔ Chassis ground ACC relay operation request Always (1) Depending on vehicle ACC circuit
(B573) No. 17 (TSW5) ↔ (B573) No. 20 (GND1) Lock/unlock button input Power OFF, all doors closed, all doors locked, trunk opener button OFF → ON 9.5 V or more → less than 2 V
(B573) No. 18 (IDW) ↔ Chassis ground ID code box presence judgment Always →1 ID code box present: less than 1 O ID code box absent: 1M Ω or more
(B573) No. 19 (ACCR) ↔ (B573) No. 20 (GND1) ACC cutoff input Brake pedal depressed, push button ignition switch pressed (while cranking) → Except when cranking Less than 2 V → 9.5 V or more
(B573) No. 20 (GND1) ↔ Chassis ground GND Always →1 Less than 1 Ω
(B573) No. 21 - - -
(B573) No. 22 - - -
(B573) No. 23 (STSW) ↔ (B573) No. 20 (GND1) Starter operation request output Shift lever is in position P or position N and access key is in passenger room. While depressing the brake pedal, press the push button ignition switch (engine starts). Less than 2 V → 9.5 V or more
(B573) No. 24 - - -
(B573) No. 25 (INDS) ↔ Chassis ground Indicator output (green) With ACC ON or IG ON, brake pedal depressed 9.5 V or more
(B573) No. 26 (SWIL) ↔ Chassis ground Start switch character illumination When illumination of start switch goes off, the headlight is OFF → ON, after setting the illumination control to MAX Less than 2 V → 9.5 V or more
(B573) No. 27 (IG2D) ↔ Chassis ground IG2 relay drive output Always (1) Depending on vehicle relay circuit
(B573) No. 28 (IG1D) ↔ Chassis ground IG1 relay drive output Always (1) Depending on vehicle relay circuit
(B574) No. 1 (CG7B) ↔ (B574) No. 17 (GND2) Trunk room antenna - All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF → ON No pulse output → Pulse output detected
(B574) No. 2 (CLG7) ↔ (B574) No. 17 (GND2) Trunk room antenna + All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF → ON No pulse output → Pulse output detected
(B574) No. 3 (CG6B) ↔ (B574) No. 17 (GND2) Rear interior antenna - All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF → ON No pulse output → Pulse output detected
(B574) No. 4 (CLG2) ↔ (B574) No. 17 (GND2) Passenger side external antenna + Power OFF, all doors closed, all doors locked by lock operation with wireless remote control, access key not in passenger room No pulse output → Pulse output detected
(B574) No. 5 (CG1B) ↔ (B574) No. 17 (GND2) Driver side external antenna - Power OFF, all doors closed, all doors locked by lock operation with wireless remote control, access key not in passenger room No pulse output → Pulse output detected
(B574) No. 6 (CLG1) ↔ (B574) No. 17 (GND2) Driver side external antenna + Power OFF, all doors closed, all doors locked by lock operation with wireless remote control, access key not in passenger room No pulse output → Pulse output detected
(B574) No. 7 (CG8B) ↔ (B574) No. 17 (GND2) Rear exterior antenna - Power OFF, all doors closed, all doors locked, trunk opener button OFF → ON No pulse output → Pulse output detected
(B574) No. 8 (CLG8) ↔ (B574) No. 17 (GND2) Rear exterior antenna + Power OFF, all doors closed, all doors locked, trunk opener button OFF → ON No pulse output → Pulse output detected
(B574) No. 9 (CLG6) ↔ (B574) No. 17 (GND2) Rear interior antenna + Power OFF, all doors closed, all doors locked, trunk opener button OFF → ON No pulse output → Pulse output detected
(B574) No. 10 - - -
(B574) No. 11 - - -
(B574) No. 12 (CG5B) ↔ (B574) No. 17 (GND2) Front interior antenna - All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF → ON No pulse output → Pulse output detected
(B574) No. 13 - - -
(B574) No. 14 - - -
(B574) No. 15 (EGIO) ↔ (B574) No. 17 (GND2) Immobilizer collation communication Ignition switch ON 7 V or more → pulse generates temporarily
(B574) No. 16 (CG2B) ↔ (B574) No. 17 (GND2) Passenger side external antenna - Power OFF, all doors closed, all doors locked by lock operation with wireless remote control, access key not in passenger room No pulse output → Pulse output detected
(B574) No. 17 (GND2) ↔ Chassis ground GND Always Less than 1 Ω
(B574) No. 18 (P) ↔ Chassis ground Shift P position input Except for shift positions P → Shift position P Depending on shift position internal resistance
(B574) No. 19 (TXCT) ↔ (B574) No. 17 (GND2) Immobilizer signal reception (start switch) Wait for 30 seconds or more after the door was opened or closed with IGN OFF and the brake pedal released. 1 V or less
Turn the ignition switch to OFF and with the access key near the push button ignition switch, press the push button ignition switch. (With the access key battery removed) Waveform 3
(B574) No. 20 (LIN) ↔ (B574) No. 17 (GND2) LIN communication ACC ON or IGN ON or power OFF, and open/close the door Pulse generation
(B574) No. 21 (VC5) ↔ (B574) No. 17 (GND2) Immobilizer amplifier power supply Wait for 30 seconds or more after the door was opened or closed with IGN OFF and the brake pedal released. 1 V or less
Within 30 seconds after the push button ignition switch is pressed with IGN OFF and access key not in the passenger room Waveform 4
(B574) No. 22 (CODE) ↔ (B574) No. 17 (GND2) Immobilizer signal reception (start switch) Wait for 30 seconds or more after the door was opened or closed with IGN OFF and the brake pedal released. 1 V or less
Within 30 seconds after the push button ignition switch is pressed with IGN OFF and access key not in the passenger room Waveform 1
(B574) No. 23 - - -
(B574) No. 24 (AGND) ↔ Chassis ground Immobilizer amplifier GND Always →1 Less than 1 Ω
(B574) No. 25 (CLG5) ↔ (B574) No. 17 (GND2) Front interior antenna + All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF → ON No pulse output → Pulse output detected
(B574) No. 26 - - -
(B574) No. 27 (STP1) ↔ Chassis ground Stop light switch input Brake pedal depressed → released 9.5 V or more → 1 V or less
(B574) No. 28 - - -
(B574) No. 29 (CANL) ↔ Chassis ground CAN communication (Lo) ACC ON or IGN ON or power OFF, and open/close the door Pulse generation
(B574) No. 30 (CANH) ↔ Chassis ground CAN communication (Hi) ACC ON or IGN ON or power OFF, and open/close the door Pulse generation
NOTE:
(1) Perform while the keyless access Control Module connector is disconnected.
  1. Waveform 1
    G10277419Courtesy of SUBARU OF AMERICA, INC.
    Item Contents
    Measured terminal (B574) No. 22 (CODE) ↔ (B574) No. 17 (GND2)
    Equipment setting 2 V/DIV, 20 ms/DIV
    Measuring condition Turn the ignition switch to OFF and with the access key near the push button ignition switch, press the push button ignition switch (with the access key battery removed).
  2. Waveform 2
    G10277420Courtesy of SUBARU OF AMERICA, INC.
    Item Contents
    Measured terminal (B573) No. 6 (TACH) ↔ Chassis ground
    Equipment setting 5 V/DIV, 100 ms/DIV
    Measuring condition While engine idling
  3. Waveform 3
    G10277421Courtesy of SUBARU OF AMERICA, INC.
    Item Contents
    Measured terminal (B574) No. 19 (TXCT) ↔ (B574) No. 17 (GND2)
    Equipment setting 2 V/DIV, 20 ms/DIV
    Measuring condition Turn the ignition switch to OFF and with the access key near the push button ignition switch, press the push button ignition switch (with the access key battery removed).
  4. Waveform 4
G10277422Courtesy of SUBARU OF AMERICA, INC.
Item Contents
Measured terminal (B574) No. 21 (VC5) ↔ (B574) No. 17 (GND2)
Equipment setting 2 V/DIV, 200 ms/DIV
Measuring condition Within 30 seconds after the push button ignition switch is pressed with IG OFF and access key not in the passenger room
scientia non olet · About LEMON Manuals