Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2023 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Keyless Access Control Module
| Terminal No. | Contents | Measuring condition | Standard | ||
|---|---|---|---|---|---|
| (i75) No. 1 (+B2) ββ Chassis ground | +B power supply (SUB) | Always(1) | 9.5 V - 16 V | ||
| (i75) No. 2 | - | - | - | ||
| (i75) No. 3 | - | - | - | ||
| (i75) No. 4 (+B1) ββ (i75) No. 20 (GND1) | +B power supply (MAIN) | Always(1) | 9.5 V - 16 V | ||
| (i75) No. 5 | - | - | - | ||
| (i75) No. 6 (TACH) ββ Chassis ground | Engine speed | While engine idling | Waveform 2 | ||
| (i75) No. 7 (SPD) ββ Chassis ground | Vehicle speed input | Always | 30 kΞ© or more | ||
| (i75) No. 8 (SSW1) ββ (i75) No. 20 (GND1) | Start switch input 1 | Push button ignition switch pressed β released(1) | Less than 1 Ξ© β 10 kΞ© or more | ||
| (i75) No. 9 (SSW2) ββ (i75) No. 20 (GND1) | Start switch input 2 | Push button ignition switch pressed β released(1) | Less than 1 Ξ© β 10 kΞ© or more | ||
| (i75) No. 10 (SLR+) ββ Chassis ground | Steering lock motor power supply signal output | Always(1) | 10 kΞ© or more | ||
| (i75) No. 11 (SLP) ββ (i75) No. 20 (GND1) | Steering lock position input | With ignition switch OFF and shift position P, and with push button ignition switch pressed, steering lock β steering unlock | 9.5 V or more β 1.2 V or less | ||
| (i75) No. 12 (INDW) ββ (i75) No. 20 (GND1) | Indicator output (orange) | With ACC ON or IG ON, brake pedal not depressed | 9.5 V or more | ||
| (i75) No. 13 | - | - | - | ||
| (i75) No. 14 | - | - | - | ||
| (i75) No. 15 | - | - | - | ||
| (i75) No. 16 (ACCD) ββ Chassis ground | ACC relay drive request | Always(1) | Depending on ACC circuit in vehicle | ||
| (i75) No. 17 (TSW5) ββ (i75) No. 20 (GND1) | Request SW input | Power supply OFF, all doors closed, all doors locked, rear gate lock button OFF β ON | 9.5 V or more β Less than 2 V | ||
| (i75) No. 18 (IDW) ββ Chassis ground | ID code box presence judgment | Always(1) | ID code box present: less than 1 Ξ© ID code box absent: 1 MΞ© or more |
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| (i75) No. 19 (ACCR) ββ (i75) No. 20 (GND1) | ACC cutoff input | Brake pedal depressed, push button ignition switch pressed (while cranking) β Except when cranking | Less than 2 V β 9.5 V or more | ||
| (i75) No. 20 (GND1) ββ Chassis ground | GND | Always(1) | Less than 1 Ξ© | ||
| (i75) No. 21 | - | - | - | ||
| (i75) No. 22 | - | - | - | ||
| (i75) No. 23 (STSW) ββ (i75) No. 20 (GND1) | Starter drive 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 start). | Less than 2 V β 9.5 V or more | ||
| (i75) No. 24 (WPC) ββ (i75) No. 20 (GND1) | Wireless charging stop request | Press the push button ignition switch with the power OFF and no access key in the passenger room. | No pulse output β Pulse output detected | ||
| (i75) No. 25 (INDS) ββ Chassis ground | Indicator output (green) | With ACC ON or IG ON, brake pedal (CVT model) or clutch pedal (MT model) depressedd | 9.5 V or more | ||
| (i75) No. 26 (SWIL) ββ Chassis ground | Start switch character illumination | When illumination of start switch goes off, the headlight is OFF β ON, after setting the illumination control to MAX | Less than 2 V β 9.5 V or more | ||
| (i75) No. 27 (IG2D) ββ Chassis ground | IG2 relay drive output | Always(1) | Depending on relay circuit in vehicle | ||
| (i75) No. 28 (IG1D) ββ Chassis ground | IG1 relay drive output | Always(1) | Depending on relay circuit in vehicle | ||
| (i241) No. 1 (CG7B) ββ (i241) No. 17 (GND2) | Luggage room antenna - | All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 2 (CLG7) ββ (i241) No. 17 (GND2) | Luggage room antenna + | All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 3 (CG6B) ββ (i241) No. 17 (GND2) | Rear interior antenna - | All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 4 (CLG2) ββ (i241) 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 β Pulse output detected | ||
| (i241) No. 5 (CG1B) ββ (i241) 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 β Pulse output detected | ||
| (i241) No. 6 (CLG1) ββ (i241) 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 β Pulse output detected | ||
| (i241) No. 7 (CG8B) ββ (i241) No. 17 (GND2) | Rear exterior antenna - | Power OFF, all doors closed, all doors locked, rear gate opener button OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 8 (CLG8) ββ (i241) No. 17 (GND2) | Rear exterior antenna + | Power OFF, all doors closed, all doors locked, rear gate opener button OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 9 (CLG6) ββ (i241) No. 17 (GND2) | Rear interior antenna + | All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 10 | - | - | - | ||
| (i241) No. 11 | - | - | - | ||
| (i241) No. 12 (CG5B) ββ (i241) No. 17 (GND2) | Front interior antenna - | All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF β ON | No pulse output β Pulse output detected | ||
| (i241) No. 13 | - | - | - | ||
| (i241) No. 14 | - | - | - | ||
| (i241) No. 15 (EGIO) ββ (i241) No. 17 (GND2) | Immobilizer collation communication line | Ignition switch ON | 7 V or more β pulse generates temporarily | ||
| (i241) No. 16 (CG2B) ββ (i241) 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 β Pulse output detected | ||
| (i241) No. 17 (GND2) ββ Chassis ground | GND | Always | Less than 1 Ξ© | ||
| (i241) No. 18 (P) ββ Chassis ground | Shift P position input | Except for shift positions P β Shift position P | Depending on shift position internal resistance | ||
| (i241) No. 19 (TXCT) ββ (i241) 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 to IG 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 | ||||
| (i241) No. 20 (LIN) ββ (i241) No. 17 (GND2) | LIN communication | ACC ON or IGN ON or power OFF, and open/close the door | Pulse generation | ||
| (i241) No. 21 (VC5) ββ (i241) 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 | ||||
| (i241) No. 22 (CODE) ββ (i241) 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 to IG 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 1 | ||||
| (i241) No. 23 | - | - | - | ||
| (i241) No. 24 (AGND) ββ Chassis ground | Immobilizer amplifier GND | Always(1) | Less than 1 Ξ© | ||
| (i241) No. 25 (CLG5) ββ (i241) No. 17 (GND2) | Front interior antenna + | All doors closed, power OFF, access key not in passenger room, touch sensor (lock) OFF β ON | No pulse output β Pulse output detected | ||
| (i241) 26 | - | - | - | ||
| (i241) No. 27 (STP1) ββ Chassis ground | Stop light switch input | Brake pedal depressed β released | 9.5 V or more β 1 V or less | ||
| (i241) No. 28 | - | - | - | ||
| (i241) No. 29 (CANL) ββ Chassis ground | CAN communication (L) | ACC ON or IGN ON or power OFF, and open/close the door | Pulse generation | ||
| (i241) No. 30 (CANH) ββ Chassis ground | CAN communication (H) | ACC ON or IGN ON or power OFF, and open/close the door | Pulse generation | ||
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- Waveform 1
Item Contents Measured terminal (i241) No. 22 (CODE) ββ (i241) No. 17 (GND2) Equipment setting 2 V/DIV, 20 ms/DIV Measuring condition Turn to IG 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 2
Item Contents Measured terminal (i75) No. 6 (TACH) ββ Chassis ground Equipment setting 5 V/DIV, 100 ms/DIV Measuring condition While engine idling - Waveform 3
Item Contents Measured terminal (i241) No. 19 (TXCT) ββ (i241) No. 17 (GND2) Equipment setting 2 V/DIV, 20 ms/DIV Measuring condition Turn to IG 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 4
| Item | Contents |
|---|---|
| Measured terminal | (i241) No. 21 (VC5) ββ (i241) 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 |
Factory Service Tools
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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.