2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Keyless Access Control Module

G09485369Courtesy of SUBARU OF AMERICA, INC.
Terminal No. Terminal symbol Content
(B572) No. 2 +B +B
(B572) No. 3 INDS Start switch indicator (green) output
(B572) No. 5 N-SW Neutral switch input
(B572) No. 7 STSW STSW output
(B572) No. 9 IG2D IG2 relay drive output
(B572) No. 10 CLUT Clutch switch input
(B572) No. 11 GND GND
(B572) No. 13 EGIO Immobilizer communication 1
(B572) No. 17 TACH Engine speed input
(B572) No. 18 STP1 Stop light switch input
(B573) No. 1 CG8B Outside rear antenna output -
(B573) No. 2 CLG8 Outside rear antenna output +
(B573) No. 5 RCO Tuner power supply
(B573) No. 8 CG7B Inside rear antenna output -
(B573) No. 9 CLG7 Inside rear antenna output +
(B573) No. 10 CG6B Inside center antenna output -
(B573) No. 11 CLG6 Inside center antenna output +
(B573) No. 15 IDW ID code box presence judgment terminal
(B573) No. 17 RDA Tuner reception data input
(B573) No. 19 RSSI Tuner reception start signal input
(B573) No. 27 TSW5 Trunk opener button input
(B573) No. 28 ACCR ACC cutoff input
(B574) No. 1 VC5 Immobilizer amplifier power supply (start switch)
(B574) No. 2 CG5B Inside front antenna output -
(B574) No. 3 CLG5 Inside front antenna output +
(B574) No. 4 ACCD ACC relay drive output
(B574) No. 5 IG IGN power supply
(B574) No. 6 IG1D IG1 relay drive output
(B574) No. 7 CODE Immobilizer signal reception (start switch)
(B574) No. 8 TSW2 Passenger's lock sensor signal input
(B574) No. 9 TXCT Immobilizer signal transmission (start switch)
(B574) No. 10 CG2B Passenger's antenna output -
(B574) No. 11 CLG2 Passenger's antenna output +
(B574) No. 12 CLG1 Driver's antenna output +
(B574) No. 13 CG1B Driver's antenna output -
(B574) No. 14 CANH HS-CAN H
(B574) No. 15 CANL HS-CAN L
(B574) No. 16 SWIL Start switch character illumination output
(B574) No. 17 LIN LIN communication
(B574) No. 18 INDW Start switch indicator (orange) output
(B574) No. 19 POS1 Driver's sensor drive power supply
(B574) No. 20 TSW1 Driver's lock sensor signal input
(B574) No. 21 POS2 Passenger's sensor drive power supply
(B574) No. 22 SEN1 Driver's unlock sensor signal input
(B574) No. 23 SEN2 Passenger's unlock sensor signal input
(B574) No. 24 AGND Immobilizer amplifier GND (start switch)
(B574) No. 25 P Parking position switch input
(B574) No. 26 SLP Steering lock position input
(B574) No. 27 SPD Vehicle speed signal input
(B574) No. 28 SSW1 Start switch input 1
(B574) No. 29 SLR+ Steering motor power supply signal output
(B574) No. 30 SSW2 Start switch input 2

Disconnect the control module connectors (B572) and (B574) before checking the following items.

NOTE: If the measured value is out of standard, it is possible that the vehicle has a fault.
Terminal No. Item Measuring condition Standard
(B572) No. 2 (+B) ←→ (B572) No. 11 (GND) Voltage Always 9.5 - 16 V
(B572) No. 11 (GND) ←→ Chassis ground Resistance Always Less than 1 Ξ©
(B574) No. 5 (IG) ←→ Chassis ground Voltage ACC ON β†’ IG ON 1 V or less β†’ 9 - 14 V

Disconnect the control module connector (B573) before checking the following items.

NOTE: If the measured value is out of standard, it is possible that the vehicle has a fault.
Terminal No. Item Measuring condition Standard
(B573) No. 15 (IDW) ←→ Chassis ground
(For C0 model only)		 Continuity Always Continuity exists

Disconnect the control module connectors (B574) and (B572) before checking the following items.

NOTE: If the measured value is out of standard, it is possible that the vehicle has a fault.
Terminal No. Item Measuring condition Standard
(B574) No. 4 (ACCD) ←→ Chassis ground Resistance Always (20Β°C) 152.61 - 216.5 Ξ©
(B572) No. 9 (IG2D) ←→ Chassis ground Resistance Always (20Β°C) 74.15 - 460.88 Ξ©
(B574) No. 6 (IG1D) ←→ Chassis ground Resistance Always (20Β°C) 50.87 - 72.17 Ξ©
(B572) No. 18 (STP1) ←→ Chassis ground
(CVT model)		 Voltage Brake pedal depressed β†’ released 11 - 14 V β†’ 1 V or less
(B574) No. 25 (P) ←→ Chassis ground
(CVT model)		 Resistance Except for shift positions P β†’ Shift position P 40 kΞ© or more β†’ 200 Ξ© or less
(B574) No. 27 (SPD) ←→ Chassis ground Resistance Always 30 kΞ© or more
(B574) No. 28 (SSW1) ←→ Chassis ground Resistance Push button ignition switch pressed β†’ released Less than 1 Ξ©? 10 kΞ© or more
(B574) No. 29 (SLR+) ←→ Chassis ground Resistance Always 10 kΞ© or more
(B574) No. 30 (SSW2) ←→ Chassis ground Resistance Push button ignition switch pressed β†’ released Less than 1 Ξ©? 10 kΞ© or more
(B574) No. 17 (LIN) ←→ Chassis ground Continuity Always Continuity does not exist
(B574) No. 14 (CANH) ←→ Chassis ground Pulse ACC ON or IGN ON Pulse generation
(B574) No. 15 (CANL) ←→ Chassis ground Pulse ACC ON or IGN ON Pulse generation

Connect the control module connector before checking the following items.

NOTE: If the measured value is out of standard, it is possible that the keyless access CONTROL MODULE has a fault.
Terminal No. Item Measuring condition Standard
(B574) No. 1 (VC5) ←→ (B574) No. 24 (AGND) Voltage 30 seconds or more have passed after the door was opened or closed with IG OFF and without depressing the brake pedal (CVT model) or clutch pedal (MT model). 1 V or less
Waveform Within 30 seconds after the push button ignition switch is pressed with IG OFF and access key not in the passenger room Waveform 1
(B574) No. 2 (CG5B) ←→ (B572) No. 11 (GND) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, touch sensor (lock) OFF β†’ ON No pulse output β†’ Pulse output detected
(B574) No. 3 (CLG5) ←→ (B572) No. 11 (GND) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, touch sensor (lock) OFF β†’ ON No pulse output β†’ Pulse output detected
(B574) No. 4 (ACCD) ←→ (B572) No. 11 (GND) Voltage IG OFF β†’ ACC ON 1 V or less β†’ 9 - 14 V
(B574) No. 6 (IG1D) ←→ (B572) No. 11 (GND) Voltage ACC ON β†’ IG ON 1 V or less β†’ 9 - 14 V
(B574) No. 7 (CODE) ←→ (B574) No. 24 (AGND) Voltage 30 seconds or more have passed after the door was opened or closed with IG OFF and without depressing the brake pedal (CVT model) or clutch pedal (MT model). 1 V or less
Waveform Turn the ignition switch to OFF and with the access key near the push button ignition switch, press the push button ignition switch*1 Waveform 2
(B574) No. 9 (TXCT) ←→ (B574) No. 24 (AGND) Voltage 30 seconds or more have passed after the door was opened or closed with IG OFF and without depressing the brake pedal (CVT model) or clutch pedal (MT model). 1 V or less
Waveform Turn the ignition switch to OFF and with the access key near the push button ignition switch, press the push button ignition switch*1 Waveform 3
(B574) No. 10 (CG2B) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked by lock operation with passenger's seat touch sensor (lock), access key not in passenger room No pulse output β†’ Pulse output detected
(B574) No. 11 (CLG2) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked by lock operation with passenger's seat touch sensor (lock), access key not in passenger room No pulse output β†’ Pulse output detected
(B574) No. 12 (CLG1) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked by lock operation with driver's seat touch sensor (lock), access key not in passenger room No pulse output β†’ Pulse output detected
(B573) No. 10 (CG6B) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked by lock operation with touch sensor (lock), access key not in passenger room No pulse output β†’ Pulse output detected
(B573) No. 11 (CLG6) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked by lock operation with touch sensor (lock), access key not in passenger room No pulse output β†’ Pulse output detected
(B574) No. 13 (CG1B) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked by lock operation with driver's seat touch sensor (lock), access key not in passenger room No pulse output β†’ Pulse output detected
(B574) No. 19 (POS1) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, access key carried, driver's seat touch sensor OFF β†’ ON 9 - 14 V β†’ less than 2 V
(B574) No. 21 (POS2) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, access key carried, passenger's seat touch sensor OFF β†’ ON 9 - 14 V β†’ less than 2 V
(B574) No. 24 (AGND) ←→ Chassis ground Resistance Always Less than 1 Ξ©
(B574) No. 25 (P) ←→ (B572) No. 11 (GND)
(CVT model)		 Voltage Except for shift positions P β†’ Shift position P 9 - 14 V or more β†’ 1.5 V or less
(B574) No. 26 (SLP) ←→ (B572) No. 11 (GND) Voltage With ignition switch OFF and shift position P, Steering lock β†’ Steering unlock 11 - 14 V β†’ 1.2 V or less
(B574) No. 27 (SPD) ←→ Chassis ground Pulse Driving at approx. 5 km/h (3 MPH) Pulse generation according to vehicle speed (approx. 5 km/h (3 MPH): 3.54 Hz)
(B574) No. 28 (SSW1) ←→ (B572) No. 11 (GND) Voltage Push button ignition switch released β†’ pressed 11 - 14 V β†’ 1 V or less
(B574) No. 29 (SLR+) ←→ (B572) No. 11 (GND) Voltage When the following conditions are met, the doors are closed β†’ opened, and steering lock motor is driven
  • Steering lock is unlocked
  • IG OFF
  • Shift position P
 11 - 14 V (Steering lock motor is stopped) β†’ 1 V or less (Steering lock motor is driven)
(B574) No. 30 (SSW2) ←→ (B572) No. 11 (GND) Voltage Push button ignition switch released β†’ pressed 11 - 14 V β†’ 1 V or less
(B573) No. 1 (CG8B) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked, trunk opener button OFF β†’ ON No pulse output β†’ Pulse output detected
(B573) No. 2 (CLG8) ←→ (B572) No. 11 (GND) Pulse ACC and IG OFF, all doors closed, all doors locked, trunk opener button OFF β†’ ON No pulse output β†’ Pulse output detected
(B573) No. 5 (RCO) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, access key is locked or unlock switch OFF β†’ ON 1 V or less β†’ 4.5 - 5.5 V
(B573) No. 8 (CG7B) ←→ (B572) No. 11 (GND) Pulse All doors closed, all doors locked, trunk opened β†’ closed No pulse output β†’ Pulse output detected
(B573) No. 9 (CLG7) ←→ (B572) No. 11 (GND) Pulse All doors closed, all doors locked, trunk opened β†’ closed No pulse output β†’ Pulse output detected
(B573) No. 19 (RSSI) ←→ (B572) No. 11 (GND) Voltage All doors closed, all doors locked, access key is locked or unlock switch OFF β†’ ON 11 - 14 V β†’ 2 V or less
(B573) No. 27 (TSW5) ←→ (B572) No. 11 (GND) Pulse/voltage ACC and IG OFF, all doors locked, trunk opener button OFF β†’ ON 9 V or more β†’ less than 2 V
(B572) No. 9 (IG2D) ←→ (B572) No. 11 (GND) Voltage ACC ON β†’ IG ON 1 V or less β†’ 9 - 14 V
(B572) No. 13 (EGIO) ←→ (B574) No. 24 (AGND) Voltage/pulse IG ON 11 to 14 V
(Waveform 4)
(B574) No. 8 (TSW2) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, passenger's seat touch sensor (lock) OFF β†’ ON 9 V or more β†’ less than 2 V (β†’ 9 V or more)
(B574) No. 20 (TSW1) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, driver's seat touch sensor (lock) OFF β†’ ON 9 V or more β†’ less than 2 V (β†’ 9 V or more)
(B574) No. 23 (SEN2) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, passenger's seat touch sensor (unlock) OFF β†’ ON 9 V or more β†’ less than 2 V (β†’ 9 V or more)
(B574) No. 22 (SEN1) ←→ (B572) No. 11 (GND) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, driver's seat touch sensor (unlock) OFF β†’ ON 9 V or more β†’ less than 2 V (β†’ 9 V or more)
(B574) No. 16 (SWIL) ←→ (B572) No. 11 (GND) Voltage When illumination of start switch goes off, headlight goes off after setting the illumination control to MAX Less than 2 V β†’ 9 V or more
(B572) No. 17 (TACH) ←→ Chassis ground Waveform While engine idling Pulse generation (waveform 5)
(B573) No. 28 (ACCR) ←→ (B572) No. 11 (GND) Voltage Brake pedal (CVT model) or clutch pedal (MT model) depressed and push button ignition switch pressed (while cranking) β†’ Except when cranking Less than 2 V β†’ 9 V or more
(B572) No. 5 (N-SW) ←→ (B572) No. 11 (GND)
(CVT model)		 Voltage ACC ON β†’ IG ON Less than 2 V β†’ 9 V or more
(B573) No. 17 (RDA) ←→ (B572) No. 11 (GND) Pulse All doors closed, all doors locked, access key is locked or unlock switch OFF β†’ ON 2 V or less β†’ 11 - 14 V β†’ 2 V or less
(B572) No. 7 (STSW) ←→ (B572) No. 11 (GND) Voltage While depressing the brake pedal with the shift lever in position P or N and with the access key inside the vehicle (AT model), or while depressing the clutch pedal (MT model), press the push button ignition switch. (Engine start) Less than 2 V β†’ 9 V or more
(B572) No. 3 (INDS) ←→ (B572) No. 11 (GND) Voltage Depress the brake pedal (CVT model) or clutch pedal (MT model). 9 V or more
(B574) No. 18 (INDW) ←→ (B572) No. 11 (GND) Voltage ACC ON or IG ON, and brake pedal (CVT model) or clutch pedal (MT model) is not depressed. 9 V or more
NOTE: *1: Remove the access key battery before checking.
  1. Waveform 1
    G08585632Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (B574) No. 1 (VC5) ←→ (B574) No. 24 (AGND)
    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
  2. Waveform 2
    G08585633Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (B574) No. 7 (CODE) ←→ (B574) No. 24 (AGND)
    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. *1
    NOTE: *1: Remove the access key battery before checking.
  3. Waveform 3
    G08585634Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (B574) No. 9 (TXCT) ←→ (B574) No. 24 (AGND)
    Equipment setting 2 V/DIV, 20 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
  4. Waveform 4
    G10219801Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (B572) No. 13 (EGIO) ←→ (B572) No. 11 (GND)
    Equipment setting 5 V/DIV, 100 ms/DIV
    Measuring condition Ignition ON
  5. Waveform 5
    G08585636Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (B572) No. 17 (TACH) ←→ Chassis ground
    Equipment setting 5 V/DIV, 100 ms/DIV
    Measuring condition While engine idling
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.