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.
2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Electrical Specification
| Terminal No. | Contents | Measuring condition | Standard |
|---|---|---|---|
| (i122) No. 1 (+) ↔ Chassis ground (-) | Front camera GND | Always | 0 V |
| (i122) No. 2 (+) ↔ Chassis ground (-) | Front camera image (-) | Ignition switch ON | When connected: 1.5 V or less When not connected: Battery voltage |
| (i122) No. 3 (+) ↔ Chassis ground (-) | Front camera image (+) | Ignition switch ON | When connected: Waveform |
| (i122) No. 4 (+) ↔ Chassis ground (-) | Power supply for front camera image | Ignition switch ON | 6 V ±0.5 V |
| (i122) No. 5 | - | - | - |
| (i122) No. 6 | - | - | - |
| (i122) No. 7 | - | - | - |
| (i122) No. 8 | - | - | - |
| (i122) No. 9 | - | - | - |
| (i122) No. 10 | - | - | - |
| (i122) No. 11 | - | - | - |
| (i122) No. 12 | U-ART communication | - | - |
| (i122) No. 13 | - | - | - |
| (i122) No. 14 | - | - | - |
| (i122) No. 15 | MFD SW + | When the battery is connected | MFD SW UP: 0 - 0.42 V MFD SW ENTER: 0.42 - 1.3 V MFD SW DOWN: 1.3 - 2.52 V KEY OFF: 2.52 - 3.3 V |
| (i122) No. 16 | MFD SW - | ||
| (i122) No. 17 | - | - | - |
| (i122) No. 18 | - | - | - |
| (i122) No. 19 | CAN H | - | - |
| (i122) No. 20 | CAN-L | - | - |
| (i122) No. 21 (+) ↔ Chassis ground (-) | GND | Always | 0 V |
| (i122) No. 22 | - | - | - |
| (i122) No. 23 (+) ↔ Chassis ground (-) | Ignition power supply | Ignition switch ON | Battery voltage |
| (i122) No. 24 (+) ↔ Chassis ground (-) | Battery power supply | When the battery is connected | Battery voltage |
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.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • 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 QuoteNo obligation. See pricing before you book.