Some pins may only be present in a specific version of the BCM. Note that if you are missing any pins (e.g. for managing DRL lights, etc.) you must do a BCM upgrade.

More Info about BCM PQ25 versions

T73a/

  1. Right high beam 7E0, auto light relay high beam
  2. Left dipped beam
  3. Battery isolator relay J713, second battery.
  4. Button illumination to GND, A29
  5. Output to DRL, LED right
  6. Rear fog light output, A88, SB18
  7. Front fog lights input from E7
  8. CAN isolation relay J788
  9. Button Emergency Braking Up!
  10. Rear lid lock motor lock signal
  11. Lock doors and tank filler flap output signal
  12. Driver door SAFELOCK motor and tank filler flap motor, B216
  13. Rear left door SAFELOCK motor, B214
  14. GND
  15. Rear left door lock, B215
  16. +30, lighting, SB48, central locking
  17. Rear left door lock
  18. Rear right door lock
  19. Driver door contact switch
  20. Passenger door lock contact switch
  21. Front passenger door lock
  22. Driver door central locking motor
  23. Rear lid handle release button
  24. Driver door central lock
  25. Central locking switch, lock signal
  26. Rear right door contact switch
  27. Bonnet contact switch, open/close to GND
  28. Hazard warning lights input signal
  29. Horn input, signal to GND
  30. GND OR Rear lid lock input signal
  31. Luggage compartment light, GND, B128,
  32. Indicator right
  33. Indicator left
  34. Rear left door contact switch
  35. –
  36. Heated seats switch-off signal
  37. Auto light input T10/2
  38. A49, heated mirrors output signal
  39. GND
  40. Right side parking light, A85
  41. Left side parking light, A84
  42. S-relief contact, SB19, ignition switch D
  43. Brake light switch, Brake light switch F, J104, D73
  44. +15a, B277, B149, SB10, SB11
  45. terminal 58 input from E1, SB7
  46. vacant on 7E0937090 Z4Y
  47. Wake up signal from Kessy J518
  48. Transporter Sliding sunroof adjustment control J245 output
  49. Output to headlight washer relay
  50. Heated windscreen relay output
  51. Sill lights? vacant on 7E0937090 Z4Y, present on 090B
  52. Fuel supply relay output signal
  53. Alarm horn relay J641
  54. Terminal 75 input from ignition lock D, T75 relay 7L6
  55. To J935 converter box, to J207 starter inhibitor relay
  56. Hazard warning light illumination
  57. Interior monitoring switch disabled light 
  58. Central locking indicator light
  59. Central locking switch, lock light signal
  60. Heated rear window on light
  61. Heated windscreen indicator light
  62. High beam on indicator, B142 OR high beam toggle in 7E0
  63. +30a input, SB59 low beam
  64. +30a, SB24
  65. 30al, A23, output dome lights, footwell lights
  66. +30a, SB21, interior lights input
  67. vacant on 7E0937090 Z4Y
  68. +30a from SB47, wiper
  69. terminal 53, front windscreen wiper output stage 1
  70. GND, wiper
  71. terminal 53b, front windscreen wiper output stage 2
  72. Horn output, C13
  73. +30, SB46, A164 horn, headlight washer

T73b/

  1. Terminal 58 output to dimmer, Left high beam 7E0
  2. Right dipped beam
  3. Output to DRL, LED left
  4. terminal 58 output to dimmer  (7E0)
  5. Left LED DRL module
  6. Right LED DRL module
  7. Licence plate lights, A3
  8. High beam flash in
  9. Output to cornering light left, D106
  10. Output to cornering light right, D107
  11. +30a, SB57, DRL power
  12. Reverse light output, B182
  13. +30A, SB43, indicators, mirrors
  14. Left turn signal, A6
  15. Left turn signal, A5
  16. Brake lights output, A18
  17. LIN to doors, MFS, B528
  18. CAN powertrain low
  19. CAN powertrain high
  20. CAN convenience high
  21. CAN convenience low
  22. CAN diag low
  23. CAN diag high
  24. LIN to G578, G213, J245, A209
  25. Contact strip in L sliding door F353, RL central locking F223
  26. Contact strip in R sliding door F353, RR central locking F223
  27. Intermittent wiper setting 1
  28. Passenger SAFELOCK motor OR R LED module LED headlights only
  29. DRL input from E1
  30. Interior monitoring disable switch input, to GND
  31. Heated rear window input signal
  32. terminal 31b, front windscreen wiper output
  33. Heated windscreen input signal
  34. Terminal 58d 58b, A4, A141 output from dimmer
  35. Transporter Sliding sunroof adjustment control J245 output
  36. LIN to H12
  37. K-line for diagnostics, LIN for J367 and alternator
  38. GND
  39. +30a, B111, SB23, J623 -> gateway
  40. GND (Up!)
  41. Selector lever solenoid N110 (New Bora)
  42. Connection 1, D101, brake light switch F vacant on 7E0937090 Z4Y
  43. Rear fog light input from E1
  44. CCS SET button
  45. CCS, to E45 and J623, A130 on/off signal
  46. CCS reset
  47. CCS cancel
  48. Reverse light input (manual), B182
  49. Connection 61, alternator with voltage regulator, B177, J367
  50. Terminal 50 in, to J532, J907, J623 T94/85, B660, J207, A41
  51. Terminal 75 input from ignition lock D, T75 relay, A33 7L3
  52. Window washer pump active signal from E1
  53. Intermittent wiper setting
  54. CAN dash high
  55. To F125 DSG control switch, park/neutral signal
  56. Left LED module LED headlights only
  57. CAN dash low
  58. Heated mirror input signal
  59. +30a input from J317, SC3, connection with J367, B246, A132, ref
  60. GND reference voltage
  61. Terminal 53c, input signal from windscreen washer switch, SB17
  62. Intermittent wiper setting
  63. Heated rear window output
  64. vacant on 7E0937090 Z4Y
  65. vacant on 7E0937090 Z4Y
  66. vacant on 7E0937090 Z4Y
  67. +30a, SB53
  68. +30a, SB39 low beam
  69. vacant
  70. vacant on 7E0937090 Z4Y
  71. vacant on 7E0937090 Z4Y
  72. vacant on 7E0937090 Z4Y
  73. vacant on 7E0937090 Z4Y

Info about pinout (from VW T5, but in 99% it’s the same like in Polo 6R):

Onboard-Supply-Unit-2009-onwards-T5Pobierz
BCM PQ25 - T73a connector

BCM PQ25 087
Example of BCM PQ25 087