Body Integrated Unit

WARNING: This page is about a different car, the 2021 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.

Contents

Measuring condition

Standard

(B280) No. 1 ←→ Chassis ground

BAT power supply (control)

Always

9 - 16 V

(B280) No. 2 ←→ Chassis ground

Turn light output right front

Right front turn signal OFF → ON

Less than 1 V → 9 - 16 V

(B280) No. 3 ←→ Chassis ground

BAT power supply (head Hi right side) (RHB)

Always

9 - 16 V

(B280) No. 4 ←→ Chassis ground

BAT power supply (illumination)

Always

9 - 16 V

(B280) No. 5 ←→ Chassis ground

Rear wiper RTN

Rear wiper stop position → in operation

Less than 1 V → 9 - 16 V

(B280) No. 6 ←→ Chassis ground

Front wiper RTN

Front wiper stop position → in operation

Less than 1 V → 9 - 16 V

(B280) No. 7 ←→ Chassis ground

BAT power supply (tail)

Always

9 - 16 V

(B280) No. 8 ←→ Chassis ground

Turn light output left front

Left front turn signal OFF → ON

Less than 1 V → 9 - 16 V

(B280) No. 9 ←→ Chassis ground

Headlight Hi right side output

Headlight Hi OFF → ON

Less than 1 V → 9 - 16 V

(B280) No. 10 ←→ Chassis ground

Tail light output

Tail light OFF → ON

Less than 1 V → 9 - 16 V

(B280) No. 11 ←→ Chassis ground

Illumination output

Illumination OFF → ON

Less than 1 V → 9 - 16 V

(B280) No. 12 ←→ Chassis ground

Key lock solenoid output (CVT Model without the keyless access with push button start system)

Ignition key inserted
Select lever, P range → other than P range

Less than 1 V → 9 - 16 V

(B287) No. 1 ←→ Chassis ground

GND

Always

Less than 1 Ω

(B287) No. 2 ←→ Chassis ground

Rear wiper relay output

Rear wiper OFF → ON

9 - 16 V → Less than 1 V

(B287) No. 3 ←→ Chassis ground

BAT power supply (head Hi left side) (LHB)

Always

9 - 16 V

(B287) No. 4 ←→ Chassis ground

BAT power supply (shift lock/key lock/turn light)

Always

9 - 16 V

(B287) No. 5 ←→ Chassis ground

DRL right relay output

While brake pedal is depressed during engine start, EPB switch ON → OFF, and then the select lever "P" range → other than P range

9 - 16 V → Less than 1 V

(B287) No. 6 ←→ Chassis ground

Lighting relay power supply (control)

ACC OFF → ON (with keyless access with push button start system), or ignition key not inserted →inserted (without keyless access with push button start system)

Less than 1 V → 9 - 16 V

(B287) No. 7 ←→ Chassis ground

Headlight Hi left side output

Headlight Hi OFF → ON

Less than 1 V → 9 - 16 V

(B287) No. 8

(B281) No. 1 ←→ Chassis ground

Front fog light relay output

Lighting switch 2 ON, then front fog light switch OFF → ON

9 - 16 V → Less than 1 V

(B281) No. 2 ←→ Chassis ground

Answer-back buzzer

Answer-back buzzer OFF → ON

Less than 1 V → 9 - 16 V

(B281) No. 3 ←→ Chassis ground

Hood switch

Hood closed → open

Less than 1 V → 9 - 16 V

(B281) No. 4 ←→ Chassis ground

Wiper deicer output

Rear window defogger switch OFF → ON (press and hold for three seconds)

9 - 16 V → Less than 1 V

(B281) No. 5 ←→t Chassis ground

Rear defogger output

Rear window defogger switch OFF → ON

9 - 16 V → Less than 1 V

(B281) No. 6

(B281) No. 7 ←→ Chassis ground

BAT (backup)

Always

9 - 16 V

(B281) No. 8

(B281) No. 9 ←→t Chassis ground

Security horn output

Security horn, not operating → operating

9 - 16 V → Less than 1 V

(B281) No. 10

(B281) No. 11

(B281) No. 12 ←→ Chassis ground

Front wiper Hi relay output (control)

Front wiper Hi switch OFF → ON (With auto wiper)

Less than 1 V → 9 - 16 V

(B281) No. 13 ←→ Chassis ground

Front wiper Lo relay output

Front wiper Lo switch OFF → ON (With auto wiper)

Less than 1 V → 9 - 16 V

(B281) No. 14 ←→ Chassis ground

EGI immobilizer communication

Always (Without keyless access with push button start system)

Serial communication

(B281) No. 15

(B281) No. 16 ←→ Chassis ground

Stop light switch

Stop light switch OFF → ON

Less than 1 V → 9 - 16 V

(B281) No. 17

Body CAN (H)

Except for sleep status ⁽¹⁾

Serial communication

(B281) No. 18

(B281) No. 19

Body CAN (L)

Except for sleep status⁽¹⁾

Serial communication

(B281) No. 20 ←→ Chassis ground

Lighting Lo relay output (control)

Lighting switch 2 OFF → ON

9 - 16 V → Less than 1 V

(i84) No. 1 ←→ Chassis ground

Key-in switch (without keyless access with push button start system)
ACC switch (with keyless access with push button start system)

Ignition key not inserted - inserted (without keyless access with push button start system)
ACC switch OFF → ON (with keyless access with push button start system)

Less than 1 V → 9 - 16 V

(i84) No. 2 ←→ Chassis ground

Turn light output left rear

Left rear turn signal OFF → ON

Less than 1 V → 9 - 16 V

(i84) No. 3 ←→ Chassis ground

Shift lock solenoid

IG ON
Select lever in P range
Stop light switch OFF (brake pedal not depressed) → ON (brake pedal depressed)

Less than 1 V → 9 - 16 V

(i84) No. 4 ←→ Chassis ground

GND

Always

Less than 1 Ω

(i84) No. 5 ←→ Chassis ground

Turn light output right rear

Right rear turn signal OFF → ON

Less than 1 V → 9 - 16 V

(i84) No. 6 ←→ Chassis ground

Door lock output (driver's seat unlock)

When UNLOCK signal is output

Less than 1 V → 9 - 16 V

(i84) No. 7 ←→ Chassis ground

Electric fuel unlock output

When UNLOCK signal is output

Less than 1 V → 9 - 16 V

(i84) No. 8 ←→ Chassis ground

Luggage light output

Rear gate opens → closes with the luggage light DOOR

Less than 1 V → 9 - 16 V

(i84) No. 9 ←→ Chassis ground

Reading light 2nd output

Any one of doors open → close

Less than 1 V → 9 - 16 V

(i84) No. 10

(i171) No. 1

Main system CAN (H)

Except for sleep status⁽¹⁾

Serial communication

(i171) No. 2

Main system CAN (L)

Except for sleep status⁽¹⁾

Serial communication

(i171) No. 3 ←→ Chassis ground

Immobilizer antenna (A)

When ignition key inserted (Without keyless access with push button start system and without immobilizer control module)

Pulse generation

(i171) No. 4 ←→ Chassis ground

Immobilizer antenna (B)

When ignition key inserted (Without keyless access with push button start system and without immobilizer control module)

Pulse generation

(i171) No. 5

(i171) No. 6 ←→ Chassis ground

Rear gate opener button

Rear gate opener button OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 7 ←→ (i171) No. 8

Sensitivity adjustment SIG

Always (With auto wiper)

0 - 6 kΩ

(i171) No. 8 ←→ Chassis ground

Sensitivity adjustment GND

(i171) No. 9 ←→ Chassis ground

Key ring illumination output

IG OFF → ON with driver's door open (With auto wiper)

Less than 1 V → 9 - 16 V

(i171) No. 10 ←→ Chassis ground

Map light output

Door opens - closes with the map light DOOR

Less than 1 V → 9 - 16 V

(i171) No. 11 ←→ Chassis ground

Room light power supply relay output

Back-up fuse not inserted → inserted, and then one-touch all lighting switch OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 12 ←→ Chassis ground

Manual unlock switch

Door unlock switch OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 13 ←→ Chassis ground

Door switch (passenger's seat)

Passenger's door closed → open

9 - 16 V → Less than 1 V

(i171) No. 14 ←→ Chassis ground

Door switch (rear seat LH)

Rear seat LH door closed → open

9 - 16 V → Less than 1 V

(i171) No. 15 ←→ Chassis ground

Door switch (rear gate)

Rear gate close → open

9 - 16 V → Less than 1 V

(i171) No. 16 ←→ Chassis ground

Reading light 3rd output

Any one of doors open → close

Less than 1 V → 9 - 16 V

(i171) No. 17

(i171) No. 18 ←→ Chassis ground

Lighting Lo relay output (redundant circuit)

Lighting switch 2 OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 19 ←→ Chassis ground

Lighting switch 2 (redundant circuit)

Lighting switch 2 OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 20 ←→ Chassis ground

Security indicator light output

When security light is illuminating

Pulse generation

(i171) No. 21 ←→ Chassis ground

Front wiper Hi switch (redundant circuit)

Front wiper Hi switch OFF → ON (With auto wiper)

Less than 1 V → 9 - 16 V

(i171) No. 22 ←→ Chassis ground

Front wiper Hi relay output (redundant circuit)

Front wiper Hi switch OFF → ON (With auto wiper)

Less than 1 V → 9 - 16 V

(i171) No. 23 ←→ Chassis ground

Lighting relay power supply (redundant circuit)

ACC OFF → ON (with keyless access with push button start system), or ignition key not inserted → inserted (without keyless access with push button start system)

Less than 1 V → 9 - 16 V

(i171) No. 24

Diagnosis related CAN (H)

Except for sleep status⁽¹⁾

Serial communication

(i171) No. 25

Diagnosis related CAN (L)

Except for sleep status⁽¹⁾

Serial communication

(i171) No. 26 ←→ Chassis ground

Dimmer Hi switch

Dimmer switch Hi beam OFF →ON

9 - 16 V → Less than 1 V

(i171) No. 27 ←→ Chassis ground

Door switch (rear seat RH)

Rear seat RH door closed → open

9 - 16 V → Less than 1 V

(i171) No. 28 ←→ (i171) No. 8

Illumination sensor signal

When lighting switch is at AUTO

0 - 4.5 V

(i171) No. 29

(i171) No. 30

(i171) No. 31

(i171) No. 32 ←→ Chassis ground

Manual lock switch

Door lock switch OFF - ON

9 - 16 V → Less than 1 V

(i171) No. 33 ←→ Chassis ground

Turn signal switch right

Turn signal switch right OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 34 ←→ (i171) No. 8

Illumination sensor power supply output

Ignition switch OFF → ON

Less than 1 V → 5 V

(i171) No. 35 ←→ Chassis ground

Lighting I switch

Lighting switch 1 OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 36 ←→ Chassis ground

Dimmer Pass switch

Dimmer switch Pass OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 37 ←→ Chassis ground

Turn hazard switch

Turn hazard switch OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 38 ←→ Chassis ground

Turn signal switch left

Turn signal switch left OFF → ON

9 - 16 V → Less than 1 V

(i171) No. 39 ←→ Chassis ground

Door switch (driver's seat)

Driver's door closed → open

9 - 16 V → Less than 1 V

(i171) No. 40 ←→ Chassis ground

P range switch

Select lever, other than P range → P range (CVT model)

9 - 16 V → Less than 1 V

(i81) No. 1 ←→ Chassis ground

Front wiper Lo switch

Front wiper Lo switch OFF → ON (With auto wiper)

Less than 1 V → 9 - 16 V

(i81) No. 2

LIN communication 2

Except for sleep status⁽¹⁾

Serial communication

(i81) No. 3 ←→ Chassis ground

Rear wiper switch (INT)

Rear wiper switch INT OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 4 ←→ Chassis ground

One-touch all lighting switch

One-touch all lighting switch OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 5

(i81) No. 6 ←→ Chassis ground

Door lock status switch passenger's seat

Passenger's door lock → unlock (With keyless access with push button start system)

9 - 16 V → Less than 1 V

(i81) No. 7

(i81) No. 8 ←→ Chassis ground

Ambient light output

Door closed → open

9 - 16 V → Less than 1 V

(i81) No. 9

(i81) No. 10 ←→ Chassis ground

Rear washer switch

Rear washer switch OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 11

(i81) No. 12 ←→ Chassis ground

Front washer switch

Front washer switch OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 13

(i81) No. 14

(i81) No. 15

(i81) No. 16

(i81) No. 17 ←→ Chassis ground

Front wiper Hi switch (control)

Front wiper Hi switch OFF → ON (With auto wiper)

Less than 1 V → 9 - 16 V

(i81) No. 18

LIN communication 1

Except for sleep status⁽¹⁾

Serial communication

(i81) No. 19 ←→ Chassis ground

Rear wiper switch (ON)

Rear wiper switch OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 20 ←→ Chassis ground

Lighting switch AUTO

Lighting switch AUTO OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 21 ←→ Chassis ground

Front wiper switch AUTO

Front wiper switch AUTO OFF → ON (With auto wiper)

9 - 16 V → Less than 1 V

(i81) No. 22 ←→ Chassis ground

Door lock status switch driver's seat

Driver's door lock → unlock (With keyless access with push button start system)

9 - 16 V → Less than 1 V

(i81) No. 23

(i81) No. 24 ←→ Chassis ground

DRL left relay output

While brake pedal is depressed during engine start, EPB switch ON → OFF, and then the select lever "P" range → other than P range

(i81) No. 25

(i81) No. 26 ←→ Chassis ground

Front fog light switch

Front fog light switch OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 27

(i81) No. 28 ←→ Chassis ground

Lighting switch 2 (control)

Lighting switch 2 OFF → ON

9 - 16 V → Less than 1 V

(i81) No. 29

(i81) No. 30

(i81) No. 31 ←→ Chassis ground

Collision detection signal

IG ON

Pulse output

(i81) No. 32

⁽¹⁾	For CAN or LIN sleep state, hold on for approx. one minute with ignition switch OFF and all the doors and trunk/rear gate closed.