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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

For AOG assistance contact:

CRC Montreal (YUL)
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07/10/19

Junction Box 4, Board 1

System Drawing Test Points:
Discrete = Black,ARINC = Blue		 Miscellaneous Equipment
Interior 25-72-07 JB4-D Pin 6C (Relay K120 X1) Test Point 1
JB4-D Pin 6D (Relay K120 X2) Test Point 4
JB4-D Pin 6B (Relay K120 A1) Test Point 16
JB4-D Pin 6E (Relay K120 A2) Test Point 5
JB4-D Pin 6A (Relay K120 A3) Test Point 6

JB4-D Pin 6H (Relay K122 X1) Test Point 32
JB4-D Pin 6J (Relay K122 X2) Test Point 23
JB4-D Pin 6G (Relay K122 A1) Test Point 29
JB4-D Pin 6K (Relay K122 A2) Test Point 26
JB4-D Pin 6F (Relay K122 A3) Test Point 15

JB4-D Pin 7C (Relay K124 X1) Test Point 19
JB4-D Pin 7D (Relay K124 X2) Test Point 22
JB4-D Pin 7B (Relay K124 A1) Test Point 31
JB4-D Pin 7E (Relay K124 A2) Test Point 25
JB4-D Pin 7A (Relay K124 A3) Test Point 35

JB4-D Pin 7H (Relay K126 X1) Test Point 38
JB4-D Pin 7J (Relay K126 X2) Test Point 37
JB4-D Pin 7G (Relay K126 A1) Test Point 21
JB4-D Pin 7K (Relay K126 A2) Test Point 34
JB4-D Pin 7F (Relay K126 A3) Test Point 28

JB4-D Pin 8C (Relay K128 X1) Test Point 43
JB4-D Pin 8D (Relay K128 X2) Test Point 61
JB4-D Pin 8B (Relay K128 A1) Test Point 55
JB4-D Pin 8E (Relay K128 A2) Test Point 58
JB4-D Pin 8A (Relay K128 A3) Test Point 40		 Relay K120, 122, 124, 126, 128
FIDEX System Bottle 2 & APU 26-21-13 JB4-E Pin 52, 53, 54 Test Point 2
JB4-E Pin 55, 56, 60 Test Point 3
JB4-E Pin 58, 57, 69 Test Point 7		 None
Integrated Avionics Processing System (IOC) 31-45-05 JB4-D Pin 13K, 14B, 14D, 14F, 14H Test Point 91 ARINC Hi
JB4-D Pin 14A, 14C, 14E, 14G, 14J Test Point 94 ARINC Lo		 L-IOC-1 Bus
Integrated Avionics Processing System 31-45-02 JB4-D Pin 11D, 11F, 11H, 11K, 12B Test Point 97 ARINC Hi
JB4-D Pin 11E, 11G, 11J, 12C, 12A Test Point 100 ARINC Lo		 L-GP-1 Bus
FIDEX System Bottle 1 26-21-05 JB4-E Pin 29, 30, 31 Test Point 17
JB4-E Pin 32, 34, 40 Test Point 14
JB4-E Pin 33, 37, 39 Test Point 11
JB4-E Pin 35, 36, 38 Test Point 8		 None
Interior Baseline Provisions Exterior Lighting Interface 33-43-07 JB4-E Pin 44, 45, 46 Test Point 10 None
EICAS Brt/Dim Power Supply System 31-52-21 JB4-E Pin 51 Test Point 9 Resistor R9, R10
Horizontal Stab Trim Control System Power 27-41-03 JB4-E Pin 41, 42, 43 Test Point 13 None
ATC Control Display System 34-54-07 JB4-D Pin 9B, 9C, 9D, 9E Test Point 70 None
Cabin Pressure System 21-31-13 JB4-D Pin 9A (Relay K142 X1, A1) Test Point 54
JB4-D Pin 8K (Relay K142 X2) Test Point 49
JB4-D Pin 8H, 8G (Relay K142 A2, B2) Test Point 52
JB4-D Pin 8J (Relay K142 B3) Test Point 45		 Relay K142
General Radio Tuning Reversion Select System 31-61-14 JB4-D Pin 9H, 9K, 10B, 10D, 10F, 10H Test Point 82
JB4-D Pin 9J, 10A, 10C, 10E, 10G, 10J Test Point 85		 None
Integrated Avionics Processing System 31-45-03 JB4-D Pin 12D, 12F, 12H, 12K, 13B, 13D, 13F, 13H Test Point 92 ARINC Hi
JB4-D Pin 12E, 12G, 12J, 13A, 13C, 13E, 13G, 13J Test Point 95 ARINC Lo		 L-GP-4 Bus
Integrated Avionics Processing PMAT MDC 45-45-01 JB4-D Pin 11B, 14K, 15B, 15E, 15H Test Point 98 ARINC Hi
JB4-D Pin 11C, 15A, 15C, 15F, 15J Test Point 101 ARINC Lo		 DBU-3 Bus
Interior Baseline Provisions Wast Disposal Electric Heated Plumbing 38-31-09 JB4-E Pin 26, 27, 28, 47, 48 Test Point 20 None

Junction Box 4, Board 2

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Ice Detection System Control 30-81-05 JB4-A Pin 11A, 11B, 11C Test Point 45 None
EICAS Power & Indication 31-41-13 JB4-A Pin 11G, 11H, 11J, 11K Test Point 55
JB4-A Pin 12A, 12B, 12C, 12D Test Point 99
JB4-A Pin 12E, 12F, 12G, 12H Test Point 102		 None
Cabin Pressure System Power & Control 21-31-13 JB4-A Pin 12K, 13A, 13B, 13C Test Point 101 None
Autopilot System Yaw Damper Actuator 22-22-01 JB4-A Pin 13D, 13E, 13F, 13G Test Point 100 None
Proximity Sensing Landing Gear Control 32-31-01 JB4-E Pin 23 (Relay K50 X1) Test Point 43
JB4-E Pin 19 (Relay K50 X2) Test Point 35
JB4-E Pin 12 (Relay K50 A1) Test Point 67
JB4-E Pin 1 (Relay K50 A2) Test Point 61
JB4-E Pin 11 (Relay K50 A3) Test Point 40
JB4-E Pin 10 (Relay K50 B1) Test Point 54
JB4-E Pin 2 (Relay K50 B2) Test Point 58
JB4-E Pin 9 (Relay K50 B3) Test Point 37
JB4-E Pin 8 (Relay K50 C1) Test Point 49
JB4-E Pin 3 (Relay K50 C2) Test Point 38
JB4-E Pin 7 (Relay K50 C3) Test Point 34
JB4-E Pin 6 (Relay K50 D1) Test Point 25
JB4-E Pin 4 (Relay K50 D2) Test Point 28
JB4-E Pin 5 (Relay K50 D3) Test Point 31

JB4-E Pin 25 (Relay K51 X1) Test Point 8
JB4-E Pin 20 (Relay K51 X2) Test Point 19
JB4-E Pin 18 (Relay K51 A1) Test Point 7
JB4-E Pin 13 (Relay K51 A2) Test Point 5
JB4-E Pin 17 (Relay K51 A3) Test Point 4
JB4-E Pin 16 (Relay K51 B1) Test Point 13
JB4-E Pin 14 (Relay K51 B2) Test Point 16
JB4-E Pin 15 (Relay K51 B3) Test Point 22

JB4-A Pin 11D, 13J, 14C Test Point 1
JB4-A Pin 11E, 13K, 14D Test Point 2
JB4-A Pin 11F, 14E, 14F Test Point 3
JB4-A Pin 13H, 14B, 14F Test Point 98		 Relay K50, K51
General Radio Tuning Nav Right System 23-51-24 RB-RIU-7
JB4-D Pin 1B, 1D, 1F Test Point 79 ARINC Hi
JB4-D Pin 1C, 1E, 1G Test Point 82 ARINC Lo
RB-RIU-8
JB4-D Pin 1H, 1K, 2B Test Point 85 ARINC Hi
JB4-D Pin 1J, 2A, 2C Test Point 88 ARINC Lo		 RB-RIU-7, RB-RIU-8 Bus
General Radio Tuning Displays Left System 23-51-25 JB4-D Pin 2H, 2D, 2F, 4H Test Point 80 ARINC Hi
JB4-D Pin 2J, 2E, 2G, 4J Test Point 83 ARINC Lo		 LB-RIU-9 Bus
EICAS RDC Interface 31-41-11 A-DCU-4
JB4-D Pin 3B, 3D, 3F, 4B, 4D, 4F Test Point 81 ARINC Hi
JB4-D Pin 3C, 3E, 3G, 4C, 4E, 4G Test Point 84 ARINC Lo
A-DCU-5
JB4-D Pin 2K, 3K, 3J Test Point 86 ARINC Hi
JB4-D Pin 3A, 4A, 3H Test Point 89 ARINC Lo		 A-DCU-4, A-DCU-5
Cabin Pressure System 21-31-15 JB4-E Pin 21 (Relay X1) Test Point 73
JB4-E Pin 22 (Relay X2) Test Point 70
JB4-A Pin 15H (Relay A2) Test Point 52
JB4-A Pin 15J (Relay A3) Test Point 91		 Relay K152
Integrated Avionics Processing System PMAT & MDC 45-45-01 JB4-D Pin 4K, 5B, 5E, 5H Test Point 87 ARINC Hi
JB4-D Pin 5A, 5C, 5F, 5J Test Point 90 ARINC Lo		 MDC-6 Bus

Junction Box 4, Board 3

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
EICAS DCU Interface 31-41-03 JB4-A Pin 7K, 8B, 8D, 8H, 8F Test Point 51 ARINC Hi
JB4-D Pin 8A, 8C, 8E, 8J, 8G Test Point 64 ARINC Lo		 B-DCU-2
Integrated Avionics Processing System 31-45-07 JB4-A Pin 6B, 6D, 6F, 6K, 6H, 7B, 7D, 7F, 7H Test Point 67 ARINC Hi
JB4-D Pin 6C, 6E, 6G, 6J, 7A, 7C, 7E, 7G, 7J Test Point 70 ARINC Lo		 R-GP-5
Engine ID & Secondary Systems Selections Data Right 73-31-03 JB4-A Pin 6B, 6D, 6F, 6K, 6H, 7B, 7D, 7F, 7H Test Point 67 ARINC Hi
JB4-D Pin 6C, 6E, 6G, 6J, 7A, 7C, 7E, 7G, 7J Test Point 70 ARINC Lo		 RB-FADEC-1
Brake Control System & PSEU Interface 32-43-49 JB4-B Pin 36, 38, 39 Test Point 3
JB4-B Pin 37, 40 Test Point 2		 None
Integrated Avionics Processing System PMAT MDC 45-45-01 MDC-3
JB4-A Pin 4F, 4B, 5B Test Point 74 ARINC Hi
JB4-A Pin 4G, 4C, 5C Test Point 77 ARINC Lo
PMAT-3
JB4-A Pin 4H, 4D, 5D Test Point 74 ARINC Hi
JB4-A Pin 4J, 4E, 5E Test Point 66 ARINC Lo		 MDC-3, PMAT-3 Bus
Fuel Distribution System 28-21-11 JB4-A Pin 1D (Relay K102 X1) Test Point 64
JB4-A Pin 1C (Relay K102 X2) Test Point 40
JB4-A Pin 1A (Relay K102 B1) Test Point 10
JB4-A Pin 1F (Relay K102 B2) Test Point 9

JB4-A Pin 1J (Relay K103 X1, A2) Test Point 53
JB4-A Pin 1G, 1H (Relay K103 X2) Test Point 55
JB4-A Pin 1K (Relay K103 A3) Test Point 34

JB4-A Pin 1F (Relay K105 X1) Test Point 9
JB4-A Pin 2C (Relay K105 X2) Test Point 11
JB4-A Pin 2D (Relay K105 A1) Test Point 13
JB4-A Pin 2B (Relay K105 A2) Test Point 12
JB4-A Pin 1A (Relay K105 B1) Test Point 10
JB4-A Pin 1F (Relay K105 B2) Test Point 9		 Relay K102, 103, 105
EICAS Power & Indication 31-41-13 JB4-A Pin 5A, 5G, 5H, 5J, 5K Test Point 1 None

Junction Box 4, Board 4

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Oxygen System 35-21-01 JB4-F Pin 5J, 5K, 6A Test Point 71 None
FIDEX System Bottle 2 Engines 26-21-09 JB4-B Pin 16, 18, 23, 28 Test Point 94
JB4-B Pin 17, 21, 24, 25 Pin 91
JB4-B Pin 19, 20, 22 Pin 100
JB4-B Pin 25, 27, 29 Pin 97		 None
Electronic Flight Instrumentation System Reversion 31-61-13 JB4-F Pin 3A, 3B, 3C Test Point 75
JB4-F Pin 3D, 3E, 3F Test Point 72		 None
Electronic Flight Instrumentation System Reversion 31-61-16 JB4-F Pin 3G, 3H, 3K, 3J Test Point 69
JB4-F Pin 4A, 4B, 4C Test Point 86		 None
Air Data Computer Signal O/P 2 34-13-09 JB4-F Pin 4D, 4F, 4J Test Point 49 ARINC Hi
JB4-F Pin 4E, 4G, 4H Test Point 52 ARINC Lo		 R-ADC-1 Bus
Rudder Pedal Force Position Sensor 27-21-17 JB4-F Pin 2C, 2D, 2E, 2F Test Point 64 None
Air Data Computer Signal O/P 1 34-13-05 JB4-F Pin 7B, 8K, 8H Test Point 55 ARINC Hi
JB4-F Pin 7A, 7C, 6J Test Point 58 ARINC Lo		 L-ADC-3 Bus
Electronic Flight Instrumentation System Bussing 31-61-32 JB4-F Pin 7K, 8B, 8F, 8D Test Point 50 ARINC Hi
JB4-F Pin 8A, 8C, 8E, 8G Test Point 53 ARINC Lo		 L-PFD-3 Bus
Hydraulic Power Control Right SOV 29-12-35 JB4-F Pin 1B (Relay K50 X1, A2) Test Point 90
JB4-F Pin 1A, 1D (Relay K50 X2) Test Point 93
JB4-F Pin 1H, 1J (Relay K50 A1) Test Point 99
JB4-F Pin 1G (Relay K50 A3) Test Point 96

JB4-F Pin 1B (Relay K138 X1) Test Point 90
JB4-F Pin 1F (Relay K138 X2, B2) Test Point 95
JB4-F Pin 1E (Relay K138 A1, B1, C3) Test Point 98
JB4-F Pin 1D, 1A (Relay K138 A2) Test Point 93
JB4-F Pin 1C (Relay K138 C2) Test Point 92		 Relay K50, K138
TAWS Power & Control 34-42-01 JB4-F Pin 6B, 6D, 6F Test Point 56 ARINC Hi
JB4-F Pin 6C, 6E, 6F Test Point 59 ARINC Lo		 TAWS-1 Bus
Integrated Processing System 31-45-04 JB4-F Pin 7D, 7F, 7H, 8H Test Point 51 ARINC Hi
JB4-F Pin 7E, 7G, 7J, 8J Test Point 54 ARINC Lo		 R-GP-4 Bus

Junction Box 4, Board 5

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Auto Pilot System Switching, Master Disconnect, Stall Protection System 22-11-29
22-11-25
27-32-01		 JB4-C Pin 4H (Relay K88 X1) Test Point 73
JB4-C Pin 2F (Relay K88 X2) Test Point 20
JB4-C Pin 4D (Relay K88 A1) Test Point 28
JB4-C Pin 4E (Relay K88 A2) Test Point 22
JB4-C Pin 4F (Relay K88 B1) Test Point 26
JB4-C Pin 4G (Relay K88 B2) Test Point 25
JB4-C Pin 4J (Relay K88 C2) Test Point 23
JB4-C Pin 5A (Relay K88 C3) Test Point 16
JB4-C Pin 4K (Relay K88 D2) Test Point 71
JB4-C Pin 5B (Relay K88 D3) Test Point 13		 Relay K88
Master Disconnect, Auto Pilot System Switching, Stall Protection System 22-11-29
22-11-25
27-32-01		 JB4-C Pin 2D (Relay K90 X1) Test Point 32
JB4-C Pin 2E (Relay K90 X2) Test Point 40
JB4-C Pin 5C (Relay K90 A2) Test Point 35
JB4-C Pin 5E (Relay K90 A3) Test Point 24
JB4-C Pin 2H, 2G (Relay K90 B1) Test Point 41
JB4-C Pin 5D (Relay K90 B2) Test Point 38
JB4-C Pin 5F (Relay K90 B3) Test Point 27
JB4-C Pin 3F (Relay K90 C3) Test Point 31
JB4-C Pin 8F (Relay K90 D2) Test Point 37
JB4-C Pin 8G (Relay K90 D3) Test Point 34		 Relay K88
Aileron Electrical System, Cockpit Control 27-12-05 JB4-C Pin 3D (Relay K53 X2) Test Point 46
JB4-C Pin 4C (Relay K53 A1) Test Point 36
JB4-C Pin 2J (Relay K53 A2) Test Point 33
JB4-C Pin 3K (Relay K53 A3, D2) Test Point 30
JB4-C Pin 3H (Relay K53 B1) Test Point 45
JB4-C Pin 3A (Relay K53 C2) Test Point 39
JB4-C Pin 3C (Relay K53 C3) Test Point 48

JB4-C Pin 3C (Relay K54 X2) Test Point 48
JB4-C Pin 4B (Relay K54 A1) Test Point 47
JB4-C Pin 2K (Relay K54 A2) Test Point 44
JB4-C Pin 3J (Relay K54 A3) Test Point 43
JB4-C Pin 3B (Relay K54 B2) Test Point 42
JB4-C Pin 3D (Relay K54 B3) Test Point 46
JB4-C Pin 3H (Relay K54 C1) Test Point 45
JB4-C Pin 3J (Relay K54 D2) Test Point 43		 Relay K53, K54
EICAS DCU Interface 31-41-03 JB4-C Pin 6F, 9K, 10E Test Point 5 ARINC Hi
JB4-C Pin 5G, 10A, 10F Test Point 8 ARINC Lo		 A-PSEU-1
AHRS Interface 34-21-09 R-AHC-2
JB4-C Pin 8H, 9B, 9H Test Point 17 ARINC Hi
JB4-C Pin 8J, 9C, 9J Test Point 11 ARINC Lo
L-AHC-3
JB4-C Pin 8K, 9D, 9F Test Point 14 ARINC Hi
JB4-C Pin 9A, 9E, 9G Test Point 9 ARINC Lo		 R-AHC-2, L-AHC-3 Bus
FIDEX System Power 26-11-05 JB4-B Pin 1, 2, 3, 7 Test Point 3
JB4-B Pin 5, 6, 8, 9 Test Point 2		 None
FIDEX System Firex Bottle 2 Engines 26-21-09 JB4-B Pin 10, 11, 12 Test Point 6 None
EICAS Brt/Dim Side & Instrument Panel Interface 31-52-05
31-52-06		 JB4-B Pin 4, 13, 14, 15 JB4-C Pin 1A, 1B, 1D, 1C, 2A, 2B, 2C, 1E, 1F, 1H, 1G, 1J, 1K Test Point 1 None
General Radio Tuning Displays Right System 23-51-26 JB4-C Pin 6H, 6K, 7B, 7D, 8D Test Point 15 ARINC Hi
JB4-C Pin 6J, 7A, 7E, 7C, 8E Test Point 12 ARINC Lo		 RB-RIU-6
Flight Management System 34-61-03 JB4-C Pin 7H, 7K, 8B Test Point 18 ARINC Hi
JB4-C Pin 7J, 8A, 8C Test Point 21 ARINC Lo		 R-FMC-6
PMAT Connections between cards 45-45-07
45-45-05		 None None
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