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 Outback BaseFACTORY OEM SERVICE PROCEDURE
Electrical Specification
NOTE:
- Terminal numbers in VDCCM&H/U connector (on the control module side) are shown in the figure.
- When the connector is removed from the VDCCM&H/U, the brake warning light (EBD warning light), ABS warning light, VDC warning light & VDC operation indicator light and VDC OFF indicator light illuminate.
| Terminal No. | Contents | Measuring condition | Standard |
|---|---|---|---|
| (B66) No. 1 ←→ Chassis ground | VDC pump motor power supply | Always | Battery voltage |
| (B66) No. 2 | RH rear brake caliper (+) | - | - |
| (B66) No. 3 | RH rear brake caliper (-) | - | - |
| (B66) No. 5 | Power unit 1 CAN_H signal | - | - |
| (B66) No. 7 | FL wheel speed sensor GND | - | - |
| (B66) No. 8 ←→ Chassis ground | Electronic parking brake indicator light | Always | Battery voltage |
| (B66) No. 11 | Chassis CAN_H signal | - | - |
| (B66) No. 12 | LH rear brake caliper (-) | - | - |
| (B66) No. 13 | LH rear brake caliper (+) | - | - |
| (B66) No. 14 | Ground | - | - |
| (B66) No. 15 | Electronic parking brake switch | - | - |
| (B66) No. 16 | Electronic parking brake switch | - | - |
| (B66) No. 19 | Power unit 1 CAN_L signal | - | - |
| (B66) No. 20 ←→ Chassis ground | Brake booster pressure sensor power supply | Ignition switch: ON | 4.85 - 5.15 V |
| (B66) No. 21 | FR wheel speed sensor signal | - | - |
| (B66) No. 22 | RR wheel speed sensor signal | - | - |
| (B66) No. 23 | RL wheel speed sensor GND | - | - |
| (B66) No. 24 | FL wheel speed sensor signal | - | - |
| (B66) No. 25 | Chassis CAN_L signal | - | - |
| (B66) No. 26 | FR wheel speed sensor GND | - | - |
| (B66) No. 27 ←→ Chassis ground | Brake fluid level switch | Ignition switch: ON | 6 V or more |
| (B66) No. 28 | Brake booster pressure sensor GND | - | - |
| (B66) No. 30 ←→ Chassis ground | VDCCM power supply | Always | Battery voltage |
| (B66) No. 31 | Electronic parking brake switch | - | - |
| (B66) No. 32 | Electronic parking brake switch | - | - |
| (B66) No. 33 ←→ Chassis ground | Stop light switch output | Ignition switch: ON | Ignition power supply voltage |
| (B66) No. 35 | VSO PIN output | - | - |
| (B66) No. 36 ←→ Chassis ground | Ignition power supply | Ignition switch: ON | Ignition power supply voltage |
| (B66) No. 37 | RR wheel speed sensor GND | - | - |
| (B66) No. 38 ←→ Chassis ground | Stop light switch | Brake pedal operation | Brake ON: Battery voltage Brake OFF: Ground |
| (B66) No. 39 | RL wheel speed sensor signal | - | - |
| (B66) No. 45 | Brake booster pressure sensor output signal | - | - |
| (B66) No. 46 | Ground | - | - |
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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