2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Body Integrated Unit

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
G13632792Courtesy of SUBARU OF AMERICA, INC.
Terminal No. Contents Measuring condition Standard
(B71) No. 1 ←→ Chassis ground BAT power supply (control) Always 9 - 16 V
(B71) No. 2 ←→ Chassis ground Turn light output, right front Right front turn signal OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(B71) No. 3 - - -
(B71) No. 4 ←→ Chassis ground BAT power supply (illumination) Always 9 - 16 V
(B71) No. 5 - - -
(B71) No. 6 - - -
(B71) No. 7 ←→ Chassis ground BAT power supply (tail) Always 9 - 16 V
(B71) No. 8 ←→ Chassis ground Turn light output, left front Left front turn signal OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(B71) No. 9 - - -
(B71) No. 10 ←→ Chassis ground Clearance/position light output Clearance/position light OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(B71) No. 11 ←→ Chassis ground Illumination output Illumination OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(B71) No. 12 ←→ Chassis ground Key lock solenoid output
(CVT Model without the keyless access with push button start system)		 Ignition key inserted, shift lever, P range β†’ other than P range Less than 1 V β†’ 9 - 16 V
(B72) No. 1 ←→ Chassis ground GND Always Less than 1 Ξ©
(B72) No. 2 - - -
(B72) No. 3 - - -
(B72) No. 4 ←→ Chassis ground BAT power supply (shift lock/key lock/turn light) Always 9 - 16 V
(B72) No. 5 ←→ Chassis ground DRL relay output DRL relay output OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(B72) No. 6 - - -
(B72) No. 7 - - -
(B72) No. 8 - - -
(B73) No. 1 - - -
(B73) No. 2 - - -
(B73) No. 3 ←→ Chassis ground Hood switch (closed side) Hood closed β†’ open Less than 1 V β†’ 9 - 16 V
(B73) No. 4 ←→ Chassis ground Hood switch (open side) Hood open β†’ close Less than 1 V β†’ 9 - 16 V
(B73) No. 5 - - -
(B73) No. 6 - - -
(B73) No. 7 ←→ Chassis ground BAT (backup) Always 9 - 16 V
(B73) No. 8 - - -
(B73) No. 9 ←→ Chassis ground Security horn output Security horn, not operating β†’ operating 9 - 16 V β†’ Less than 1 V
(B73) No. 10 - - -
(B73) No. 11 - - -
(B73) No. 12 - - -
(B73) No. 13 - - -
(B73) No. 14 ←→ Chassis ground EGI immobilizer communication
(Without keyless access with push button start system and without immobilizer control module)		 Always 1 MΞ© or more
(B73) No. 15 - - -
(B73) No. 16 ←→ Chassis ground Stop light switch Stop light switch OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(B73) No. 17 Body CAN (H) Except for sleep status (1) Serial communication
(B73) No. 18 ←→ Chassis ground MT reverse switch
(MT model)		 Reverse switch OFF (other than shift lever reverse) β†’ ON (reverse) Less than 1 V β†’ 9 - 16 V
(B73) No. 19 Body CAN (L) Except for sleep status (1) Serial communication
(B73) No. 20 LAMP LIN Except for sleep status (1) Serial communication
(i81) No. 1 ←→ Chassis ground Tail light output Tail light output OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(i81) No. 2 ←→ Chassis ground Turn light output, left rear Left rear turn signal OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(i81) No. 3 ←→ Chassis ground Shift lock solenoid
(CVT model)		 IG ON shift lever P range stop light switch OFF (brake pedal not depressed) β†’ ON (brake pedal depressed) Less than 1 V β†’ 9 - 16 V
(i81) No. 4 ←→ Chassis ground GND Always Less than 1 Ξ©
(i81) No. 5 ←→ Chassis ground Turn light output, right rear Right rear turn signal OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(i81) No. 6 ←→ Chassis ground Door lock output (driver's seat unlock) When UNLOCK signal is output Less than 1 V β†’ 9 - 16 V
(i81) No. 7 ←→ Chassis ground Electric fuel unlock output When UNLOCK signal is output Less than 1 V β†’ 9 - 16 V
(i81) No. 8 - - -
(i81) No. 9 ←→ Chassis ground Room light output Door closed β†’ open with the light side SW interlocked with the door 9 - 16 V β†’ Less than 1 V
(i81) No. 10 - - -
(i82) No. 1 - - -
(i82) No. 2 - - -
(i82) No. 3 ←→ Chassis ground Immobilizer antenna (A)
(Without keyless access with push button start system and without immobilizer control module)		 When ignition key inserted Pulse generation
(i82) No. 4 ←→ Chassis ground Immobilizer antenna (B)
(Without keyless access with push button start system and without immobilizer control module)		 When ignition key inserted Pulse generation
(i82) No. 5 - - -
(i82) No. 6 ←→ Chassis ground Opener switch (rear gate/trunk) Opener switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 7 ←→ (i82) No. 8 Front wiper intermittent sensitivity adjustment Always 0 - 6 kΞ©
(i82) No. 8 ←→ Chassis ground Front wiper intermittent sensitivity adjustment GND - -
(i82) No. 9 ←→ Chassis ground Key ring illumination output
(Without keyless access with push button start system)		 Key ring OFF β†’ ON (IG ON β†’ OFF with driver's door open) Less than 1 V β†’ 9 - 16 V
(i82) No. 10 ←→ Chassis ground Map light output Door closed β†’ open with the light side SW interlocked with the door Less than 1 V β†’ 9 - 16 V
(i82) No. 11 - - -
(i82) No. 12 ←→ Chassis ground Manual unlock switch Door unlock switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 13 ←→ Chassis ground Door switch (passenger's seat) Passenger's door closed β†’ open 9 - 16 V β†’ Less than 1 V
(i82) No. 14 ←→ Chassis ground Door switch (rear seat LH) Rear seat LH door closed β†’ open 9 - 16 V β†’ Less than 1 V
(i82) No. 15 ←→ Chassis ground Door switch (rear gate/trunk) Trunk closed β†’ open 9 - 16 V β†’ Less than 1 V
(i82) No. 16 - - -
(i82) No. 17 - - -
(i82) No. 18 - - -
(i82) No. 19 ←→ Chassis ground Key-in switch
(Without keyless access with push button start system)		 Ignition key not inserted β†’ inserted Less than 1 V β†’ 9 - 16 V
ACC switch
(With keyless access with push button start system)		 ACC switch OFF β†’ ON
(i82) No. 20 ←→ Chassis ground Security light output When security light is illuminating Pulse generation
(i82) No. 21 - - -
(i82) No. 22 ←→ Chassis ground Turn signal switch (press and held)
  • Ignition switch ON
  • Turn signal switch (press and held) OFF β†’ ON (right/left)
 9 - 16 V β†’ Less than 1 V
(i82) No. 23 - - -
(i82) No. 24 - - -
(i82) No. 25 - - -
(i82) No. 26 ←→ Chassis ground Dimmer Hi switch Dimmer switch Hi beam OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 27 ←→ Chassis ground Door switch (rear seat RH) Rear seat RH door closed β†’ open 9 - 16 V β†’ Less than 1 V
(i82) No. 28 ←→ (i82) No. 8 Illumination sensor signal Lighting AUTO switch ON 0 - 5 V
(i82) No. 29 - - -
(i82) No. 30 - - -
(i82) No. 31 - - -
(i82) No. 32 ←→ Chassis ground Manual lock switch Door lock switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 33 ←→ Chassis ground Turn signal RH switch (lightly pressed) Right turn signal switch (lightly pressed) OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 34 ←→ (i82) No. 8 Illumination sensor power supply output Ignition switch OFF β†’ ON 1 - 5 V
(i82) No. 35 ←→ Chassis ground Lighting I switch Lighting switch 1 OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 36 ←→ Chassis ground Dimmer Pass switch Dimmer switch Pass OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 37 ←→ Chassis ground Turn hazard switch Turn hazard switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 38 ←→ Chassis ground Turn signal LH switch (lightly pressed) Left turn signal switch (lightly pressed) OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i82) No. 39 ←→ Chassis ground Door switch (driver's seat) Driver's door closed β†’ open 9 - 16 V β†’ Less than 1 V
(i82) No. 40 ←→ Chassis ground P range switch
(CVT model)		 Shift lever, other than P range β†’ P range 9 - 16 V β†’ Less than 1 V
(i83) No. 1 ←→ Chassis ground Front wiper Lo switch Front wiper Lo switch OFF β†’ ON Less than 1 V β†’ 9 - 16 V
(i83) No. 2 P/W LIN Except for sleep status (1) Serial communication
(i83) No. 3 ←→ Chassis ground Rear wiper switch (INT) Rear wiper switch INT OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i83) No. 4 - - -
(i83) No. 5 ←→ Chassis ground - - -
(i83) No. 6 ←→ Chassis ground Door lock status switch passenger's seat
(With keyless access with push button start system)		 Passenger's door lock β†’ unlock 9 - 16 V β†’ Less than 1 V
(i83) No. 7 - - -
(i83) No. 8 - - -
(i83) No. 9 - - -
(i83) No. 10 ←→ Chassis ground Rear washer switch Rear washer switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i83) No. 11 - - -
(i83) No. 12 ←→ Chassis ground Front washer switch Front washer switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i83) No. 13 - - -
(i83) No. 14 - - -
(i83) No. 15 - - -
(i83) No. 16 - - -
(i83) No. 17 ←→ Chassis ground Front wiper Hi switch Front wiper Hi switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i83) No. 18 BODY LIN Except for sleep status (1) Serial communication
(i83) No. 19 ←→ Chassis ground Rear wiper switch (ON)
  • Ignition switch ON
  • Rear wiper switch OFF β†’ ON
 9 - 16 V β†’ Less than 1 V
(i83) No. 20 ←→ Chassis ground Lighting switch AUTO
(Except for Canada)		 Lighting switch AUTO
OFF β†’ ON		 9 - 16 V β†’ Less than 1 V
Lighting switch OFF
(For Canada)		 Lighting switch OFF
OFF β†’ ON
(i83) No. 21 ←→ Chassis ground Front wiper AUTO/INT switch
  • Ignition switch ON
  • Front wiper AUTO/INT switch OFF β†’ ON
 9 - 16 V β†’ Less than 1 V
(i83) No. 22 ←→ Chassis ground Door lock status switch driver's seat
(With keyless access with push button start system)		 Driver's door lock β†’ unlock 9 - 16 V β†’ Less than 1 V
(i83) No. 23 - - -
(i83) No. 24 - - -
(i83) No. 25 - - -
(i83) No. 26 ←→ Chassis ground Front fog light switch Front fog light switch OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i83) No. 27 - - -
(i83) No. 28 ←→ Chassis ground Lighting II switch Lighting switch II OFF β†’ ON 9 - 16 V β†’ Less than 1 V
(i83) No. 29 - - -
(i83) No. 30 ←→ Chassis ground Luggage/trunk light output Trunk closed β†’ open 9 - 16 V β†’ Less than 1 V
(i83) No. 31 ←→ Chassis ground Collision detection signal Ignition switch ON Pulse output
(i83) No. 32 - - -
(1) CAN sleep state: Hold on for approx. one minute with ignition switch OFF and all the doors and rear gate closed.
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.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ 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 Quote

No obligation. See pricing before you book.