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 Forester BaseFACTORY OEM SERVICE PROCEDURE
Power Seat & Remote Control Mirror Control Module
| Terminal No. | Contents | Measuring condition | Standard | Note |
|---|---|---|---|---|
| (R502) No. 1 ←→ Chassis ground | Mirror load drive power supply | Always | 9.0 - 16 V | |
| (R502) No. 2 ←→ Chassis ground | ECM power supply | Always | 9.0 - 16 V | |
| (R502) No. 3 | - | - | - | - |
| (R502) No. 4 | Remote control mirror SW power supply | When the mirror surface is operated | 9.0 - 16 V | - |
| (R502) No. 5 | Remote control mirror SW MAL input (L side) | When the mirror surface is operated (up) | 10 kΩ or more | Only when the left mirror is operated |
| When the mirror surface is operated (down) | 10 kΩ or more | Only when the left mirror is operated | ||
| When the mirror surface is operated (right) | 1.5 V or less | Only when the left mirror is operated | ||
| When the mirror surface is operated (left) | 3.7 V or more | Only when the left mirror is operated | ||
| (R502) No. 6 | Remote control mirror SW MCL input (L side) | When the mirror surface is operated (up) | 3.7 V or more | Common to both the right and left mirror operation |
| When the mirror surface is operated (down) | 1.5 V or less | Common to both the right and left mirror operation | ||
| When the mirror surface is operated (right) | 3.7 V or more | Common to both the right and left mirror operation | ||
| When the mirror surface is operated (left) | 1.5 V or less | Common to both the right and left mirror operation | ||
| (R502) No. 7 | - | - | - | - |
| (R502) No. 8 ←→ Chassis ground | Ignition power supply | IG ON | 9.0 - 16 V | |
| (R502) No. 9 ←→ Chassis ground | ACC power supply | ACC ON | 9.0 - 16 V | |
| (R502) No. 10 ←→ Chassis ground | ECM GND | Always | 0 V | |
| (R502) No. 11 | - | - | - | - |
| (R502) No. 12 | - | - | - | - |
| (R502) No. 13 | - | - | - | - |
| (R502) No. 14 | Remote control mirror SW MAR input (R side) | When the mirror surface is operated (up) | 10 kΩ or more | Only when the right mirror is operated |
| When the mirror surface is operated (down) | 10 kΩ or more | Only when the right mirror is operated | ||
| When the mirror surface is operated (right) | 1.5 V or less | Only when the right mirror is operated | ||
| When the mirror surface is operated (left) | 3.7 V or more | Only when the right mirror is operated | ||
| (R502) No. 15 | Remote control mirror SW MBR input (R side) | When the mirror surface is operated (up) | 10 kΩ or more | Only when the right mirror is operated |
| When the mirror surface is operated (down) | 10 kΩ or more | Only when the right mirror is operated | ||
| When the mirror surface is operated (right) | 1.5 V or less | Only when the right mirror is operated | ||
| When the mirror surface is operated (left) | 3.7 V or more | Only when the right mirror is operated | ||
| (R502) No. 16 | Remote control mirror SW MBL input (L side) | When the mirror surface is operated (up) | 1.5 V or less | Only when the left mirror is operated |
| When the mirror surface is operated (down) | 3.7 V or more | Only when the left mirror is operated | ||
| When the mirror surface is operated (right) | 10 kΩ or more | Only when the left mirror is operated | ||
| When the mirror surface is operated (left) | 10 kΩ or more | Only when the left mirror is operated | ||
| (R502) No. 17 | - | - | - | - |
| (R502) No. 18 | LIN communication | - | Cannot be measured | - |
| (R502) No. 19 | - | - | - | - |
| (R502) No. 20 | - | - | - | - |
| (R502) No. 21 | - | - | - | - |
| (R502) No. 22 | - | - | - | - |
| (R502) No. 23 | - | - | - | - |
| (R502) No. 24 | - | - | - | - |
| (R502) No. 25 | - | - | - | - |
| (R502) No. 26 ←→ Chassis ground | Mirror SW GND | Always | 10 kΩ or more | |
| (R502) No. 27 | - | - | - | - |
| (R502) No. 28 | Memory 2 | Switch ON | 1 V or less | - |
| (R502) No. 29 | Memory 1 | Switch ON | 1 V or less | - |
| (R502) No. 30 | Memory set | Switch ON | 1 V or less | - |
| (R503) No. 1 | Tilt motor (+) | When the motor is operated | 9.0 - 16 V | - |
| (R503) No. 2 | Tilt motor (-) | When the motor is operated | 9.0 - 16 V | - |
| (R503) No. 3 | L side mirror memory sensor input - (up/down) | Always | 0 - 5.0 V | Changes when the left side mirror surface is operated in the up/down direction Down direction: 0 V - Up direction: 5.0 V |
| (R503) No. 4 | L side mirror memory sensor input - (left/right) | Always | 0 - 5.0 V | Changes when the left side mirror surface is operated in the left/right direction Right direction (inward): 0 V - Left direction (outward): 5.0 V |
| (R503) No. 5 | Reclining motor (+) | - | - | - |
| (R503) No. 6 | Reclining motor (-) | - | - | - |
| (R503) No. 7 | L side mirror surface output (+) | When the mirror surface is operated (up, right) | (+B voltage) - 1.2 V or more | |
| When the mirror surface is operated (down, left) | 0.7 V or less | |||
| (R503) No. 8 | L side mirror surface output (up/down) | When the mirror surface is operated (up) | 0.7 V or less | - |
| When the mirror surface is operated (down) | (+B voltage) - 1.2 V or more | - | ||
| (R503) No. 9 | L side mirror surface output (left/right) | When the mirror surface is operated (right) | 0.7 V or less | - |
| When the mirror surface is operated (left) | (+B voltage) - 1.2 V or more | - | ||
| (R503) No. 10 | L side mirror memory sensor power supply | Always | 5.0 V | - |
| (R503) No. 11 | R side mirror memory sensor input (up/down) | Always | 0 - 5.0 V | Changes when the right side mirror surface is operated in the up/down direction Down direction: 0 V - Up direction: 5.0 V |
| (R503) No. 12 | R side mirror memory sensor input (left/right) | Always | 0 - 5.0 V | Changes when the right side mirror surface is operated in the left/right direction Right direction (outward): 5.0 V - Left direction (inward): 0 V |
| (R503) No. 13 | L side mirror memory sensor GND | Always | 1 Ω or less | - |
| (R503) No. 14 | - | - | - | - |
| (R503) No. 15 | - | - | - | - |
| (R503) No. 16 | - | - | - | - |
| (R503) No. 17 | R side mirror surface motor output (left/right) | When the mirror surface is operated (right) | (+B voltage) - 1.2 V or more | - |
| When the mirror surface is operated (left) | (+B voltage) - 1.2 V or more | - | ||
| (R503) No. 18 | R side mirror surface motor output (up/down) | When the mirror surface is operated (up) | 0.7 V or less | - |
| When the mirror surface is operated (down) | (+B voltage) - 1.2 V or more | - | ||
| (R503) No. 19 | R side mirror surface motor output (+) | When the mirror surface is operated (up, right) | (+B voltage) - 1.2 V or more | |
| When the mirror surface is operated (down, left) | 0.7 V or less | |||
| (R503) No. 20 | R side mirror memory sensor power supply | Always | 5.0 V | - |
| (R503) No. 21 | R side mirror memory sensor GND | Always | 1 Ω or less | - |
| (R503) No. 22 | - | - | - | - |
| (R503) No. 23 | - | - | - | - |
| (R503) No. 24 | - | - | - | - |
| (R504) No. 1 | Seat motor drive power supply | Always | 9.0 - 16 V | - |
| (R504) No. 2 | ECM GND | Always | 1 Ω or less | - |
| (R504) No. 3 | Slide motor (+) | When the motor is operated | 9.0 - 16 V | - |
| (R504) No. 4 | Slide motor (-) | When the motor is operated | 9.0 - 16 V | - |
| (R504) No. 5 | Lifter motor (+) | When the motor is operated | 9.0 - 16 V | - |
| (R504) No. 6 | Lifter motor (-) | When the motor is operated | 9.0 - 16 V | - |
| (R504) No. 7 | Slide switch (+) | Switch ON | 1.5 V or less | - |
| (R504) No. 8 | Tilt switch (+) | Switch ON | 1.5 V or less | - |
| (R504) No. 9 | Reclining switch (+) | Switch ON | 1.5 V or less | - |
| (R504) No. 10 | Lifter switch (+) | Switch ON | 1.5 V or less | - |
| (R504) No. 11 | - | - | - | - |
| (R504) No. 12 | Seat pulse sensor GND | Always | 1 Ω or less | - |
| (R504) No. 13 | - | - | - | - |
| (R504) No. 14 | - | - | - | - |
| (R504) No. 15 | Tilt pulse | When the motor is operated | Pulse input | - |
| (R504) No. 16 | - | - | - | - |
| (R504) No. 17 | Lifter pulse | When the motor is operated | Pulse input | - |
| (R504) No. 18 | Slide switch (-) | Switch ON | 1.5 V or less | - |
| (R504) No. 19 | Tilt switch (-) | Switch ON | 1.5 V or less | - |
| (R504) No. 20 | Reclining switch (-) | Switch ON | 1.5 V or less | - |
| (R504) No. 21 | Lifter switch (-) | Switch ON | 1.5 V or less | - |
| (R504) No. 22 | Seat motor pulse sensor power supply | Always | - | |
| (R504) No. 23 | - | - | - | - |
| (R504) No. 24 | Reclining pulse | When the motor is operated | Pulse input | - |
| (R504) No. 25 | - | - | - | - |
| (R504) No. 26 | Slide pulse | When the motor is operated | Pulse input | - |
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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