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Home >> Subaru >> 2013 >> Legacy Base, Automatic CVT Trans >> 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 >> Keyless Access Cm
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Keyless Access Cm

Fig 1: Keyless Access CM Terminals Layout
G08585631Courtesy of SUBARU OF AMERICA, INC.

Disconnect the control module connector (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
(B572) No. 2 (+B) ↔ (B572) No. 11 (E) Voltage Always 9.5 - 16 V
(B572) No. 11 (E) ↔ Chassis ground Resistance Always Less than 1 Ω

Disconnect the control module connector (i241) 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
(i241) No. 15 (IDW) ↔ Chassis ground Continuity Always Continuity exists

Disconnect the control module connectors (i242) 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
(i242) No. 4 (ACCD) ↔ Chassis ground Voltage Always (20°C) 152.61 - 216.5 Ω
(B572) No. 9 (IG2D) ↔ Chassis ground Resistance Always (20°C) 74.15 - 460.88 Ω
(i242) No. 6 (IG1D) ↔ Chassis ground Resistance Always (20°C) 50.87 - 72.17 Ω
(B572) No. 18 (STP1) ↔ Chassis ground (AT model only) Voltage Brake pedal depressed → released 11 - 14 V → 1 V or less
(i242) No. 25 (P) ↔ Chassis ground (AT model only) Resistance Except for shift positions P → Shift position P 40 kΩ or more → 200 Ω or less
(i242) No. 27 (SPD) ↔ Chassis ground Resistance Always 30 kΩ or more
(i242) No. 28 (SSW1) ↔ Chassis ground Resistance Push button ignition switch pressed → released Less than 1 Ω → 10 kΩ or more
(i242) No. 29 (SLR+) ↔ Chassis ground Resistance Always 10 kΩ or more
(i242) No. 30 (SSW2) ↔ Chassis ground Resistance Push button ignition switch pressed → released Less than 1 Ω → 10 kΩ or more
(i242) No. 17 (LIN) ↔ Chassis ground Continuity Always Continuity does not exist
(i242) No. 14 (CANH) ↔ Chassis ground Pulse ACC ON or IGN ON or ACC and IGN OFF and open/close the door Pulse generation
(i242) No. 15 (CANL) ↔ Chassis ground Pulse ACC ON or IGN ON or ACC and IGN OFF and open/close the door 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 CM has a fault.
Terminal No. Item Measuring condition Standard
(i242) No. 1 (VC5) ↔ (i242) No. 24 (AGND) Voltage 30 seconds or more have passed after the door was opened or closed with IG OFF and the brake pedal released. 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
(i242) No. 2 (CG5B) ↔ (B572) No. 11 (E) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, front lock button OFF → ON No pulse output → Pulse output detected
(i242) No. 3 (CLG5) ↔ (B572) No. 11 (E) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, front lock button OFF → ON No pulse output → Pulse output detected
(i242) No. 4 (ACCD) ↔ (B572) No. 11 (E) Voltage IG OFF → ACC ON 1 V or less → 9 - 14 V
(i242) No. 6 (IG1D) ↔ (B572) No. 11 (E) Voltage ACC ON → IG ON 1 V or less → 9 - 14 V
(i242) No. 7 (CODE) ↔ (i242) No. 24 (AGND) Voltage 30 seconds or more have passed after the door was opened or closed with IG OFF and the brake pedal released. 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
(i242) No. 9 (TXCT) ↔ (i242) No. 24 (AGND) Voltage 30 seconds or more have passed after the door was opened or closed with IG OFF and the brake pedal released. 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
(i242) No. 10 (CG2B) ↔ (B572) No. 11 (E) Pulse ACC and IG 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
(i242) No. 11 (CLG2) ↔ (B572) No. 11 (E) Pulse ACC and IG 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
(i242) No. 12 (CLG1) ↔ (B572) No. 11 (E) Pulse ACC and IG 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
(i242) No. 13 (CG1B) ↔ (B572) No. 11 (E) Pulse ACC and IG 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
(i242) No. 19 (SEL1) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, access key carried, driver's seat touch sensor OFF → ON 9 - 14 V → less than 2V
(i242) No. 21 (SEL2) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, access key carried, driver's seat touch sensor OFF → ON 9 - 14 V → less than 2V
(i242) No. 24 (AGND) ↔ Chassis ground Resistance Always Less than 1 Ω
(i242) No. 25 (P) ↔ (B572) No. 11 (E) (AT model only) Voltage Except for shift positions P → Shift position P 9 - 14 V or more → 1.5 V or less
(i242) No. 26 (SLP) ↔ (B572) No. 11 (E) Voltage With ignition switch OFF and shift position P, Steering lock → Steering unlock 11 - 14 V → 1.2 V or less
(i242) No. 27 (SPD) ↔ Chassis ground Pulse Driving at approx. 5 km/h Pulse generation according to vehicle speed (approx. 5 km/h: 3.54 Hz)
(i242) No. 28 (SSW1) ↔ (B572) No. 11 (E) Voltage Push button ignition switch released → pressed 11 - 14 V → 1 V or less
(i242) No. 29 (SLR+) ↔ (B572) No. 11 (E) Voltage When the following conditions are met, the doors are closed → opened, and steering lock motor is driven
  • Steering lock is unlocked
  • IG OFF
  • Shift position P
 11 - 14 V (Steering lock motor is stopped) → 1 V or less (Steering lock motor is driven)
(i242) No. 30 (SSW2) ↔ (B572) No. 11 (E) Voltage Push button ignition switch released → pressed 11 - 14 V → 1 V or less
(i241) No. 1 (CG8B) ↔ (B572) No. 11 (E) Pulse ACC and IG OFF, all doors closed, trunk or rear gate opener button OFF → ON No pulse output → Pulse output detected
(i241) No. 2 (CLG8) ↔ (B572) No. 11 (E) Pulse ACC and IG OFF, all doors closed, trunk or rear gate opener button OFF → ON No pulse output → Pulse output detected
(i241) No. 5 (RCO) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, access key is locked or unlock switch OFF → ON 1 V or less → 4.5 - 5.5 V
(i241) No. 8 (CG7B) ↔ (B572) No. 11 (E) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, front lock button OFF → ON No pulse output → Pulse output detected
(i241) No. 9 (CLG7) ↔ (B572) No. 11 (E) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, front lock button OFF → ON No pulse output → Pulse output detected
(i241) No. 19 (RSSI) ↔ (B572) No. 11 (E) Voltage All doors closed, all doors locked, access key is locked or unlock switch OFF → ON 11 - 14 V → 2 V or less
(i241) No. 27 (TSW5) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, all doors locked, trunk or rear gate lock button OFF → ON 9 V or more → less than 2 V
(B572) No. 9 (IG2D) ↔ (B572) No. 11 (E) Voltage ACC ON → IG ON 1 V or less → 9 - 14 V
(B572) No. 13 (EGIO) ↔ (i242) No. 24 (AGND) Voltage/pulse IG ON 11 - 14 V → pulse generation (waveform 4)
(i242) No. 8 (TSW2) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, passenger's front lock button OFF → ON 9 V or more → less than 2 V (→ 9 V or more)
(i242) No. 18 (TSW1) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, driver's front lock button OFF → ON 9 V or more → less than 2 V (→ 9 V or more)
(i242) No. 23 (SEN2) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, passenger's seat touch sensor OFF → ON 9 V or more → less than 2 V (→ 9 V or more)
(i242) No. 22 (SEN1) ↔ (B572) No. 11 (E) Voltage ACC and IG OFF, all doors closed, all doors locked, access key carried, driver's seat touch sensor OFF → ON 9 V or more → less than 2 V (→ 9 V or more)
(i242) No. 16 (SWIL) ↔ (B572) No. 11 (E) Voltage When illumination of start switch goes off, headlight goes off after setting the illumination control to MAX Less than 2 V → 9 V or more
(i242) No. 17 (TACH) ↔ Chassis ground Waveform While engine idling Pulse generation (waveform 5)
(i241) No. 28 (ACCR) ↔ (B572) No. 11 (E) Voltage Brake pedal depressed, push button ignition switch pressed (while cranking) → Except when cranking Less than 2 V → 9 V or more
(B572) No. 5 (N-SW) ↔ (B572) No. 11 (E) (AT model only) Voltage Shift position N → other than P or N Less than 2 V → 9 V or more
(i241) No. 10 (CG6B) ↔ (B572) No. 11 (E) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, front lock button OFF → ON No pulse output → Pulse output detected
(i241) No. 11 (CLG6) ↔ (B572) No. 11 (E) Pulse All doors closed, ACC and IG OFF, access key not in passenger room, front lock button OFF → ON No pulse output → Pulse output detected
(B572) No. 17 (RDA) ↔ (B572) No. 11 (E) Pulse All doors closed, all doors locked, access key is locked or unlock switch OFF → ON 2 V or less → 11 - 14 V → 2 V or less
(B572) No. 7 (STSW) ↔ (B572) No. 11 (E) Voltage 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 start) Less than 2 V → 9 V or more
(B572) No. 3 (INDS) ↔ (B572) No. 11 (E) Voltage Depress the brake pedal. 9 V or more
(i242) No. 18 (INDW) ↔ (B572) No. 11 (E) Voltage With ACC ON or IG ON, brake pedal not depressed. 9 V or more
(1) Remove the access key battery before checking.
  1. Waveform 1
    Fig 2: Control Module I/O Signal Waveform 1
    G08585632Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (i242) No. 1 (VC5) ↔ (i242) 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
    Fig 3: Control Module I/O Signal Waveform 2
    G08585633Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (i242) No. 7 (CODE) ↔ (i242) 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)
    (1) Remove the access key battery before checking.
  3. Waveform 3
    Fig 4: Control Module I/O Signal Waveform 3
    G08585634Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (i242) No. 9 (TXCT) ↔ (i242) 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
    Fig 5: Control Module I/O Signal Waveform 4
    G08585635Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Measured terminal (B572) No. 11 (EFIO) ↔ (B572) No. 11 (E)
    Equipment setting 10 V/DIV, 100 ms/DIV
    Measuring condition Ignition ON
  5. Waveform 5
    Fig 6: Control Module I/O Signal Waveform 5
    G08585636Courtesy of SUBARU OF AMERICA, INC.
    Item Content
    Equipment setting 5 V/DIV, 100 ms/DIV
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