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.
2019 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Electrical Specification
| Item | Connector No. | Terminal No. | Input/Output signal |
|---|---|---|---|
| Measured value and measuring conditions | |||
| Battery power supply | B281 | 7 | 9 - 16 V |
| B287 | 4 | ||
| TCM ("P" range) | i171 | 1 | Pulse signal (CAN communication) |
| i171 | 2 | ||
| Stop light switch | B281 | 16 | 9 - 16 V when stop light switch is ON 1 V when stop light switch is OFF |
| "P" range switch | i171 | 40 | Less than 1 V when select lever is in "P" range 9 - 16 V when select lever is in other positions than "P" range |
| Solenoid unit output | i84 | 3 | 9 - 16 V when shift lock is released. Less than 1 V when shift lock is operating. |
| Key warning switch signal (Model without push button ignition switch) | i84 | 1 | 9 - 16 V when key is inserted. Less than 1 V when key is removed. |
| Key lock solenoid signal (Model without push button ignition switch) | B280 | 12 | |
| 9 - 16 V when the key is inserted with the select lever shifted in positions other than "P" range. Less than 1 V at other conditions than above |
|||
| Ground | i84 | 4 | Less than 1 V |
| B287 | 1 |
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:
- • 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.
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