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Select color for CAS message that you wish to troubleshoot

(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 2, Board 1

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Air Conditioning System Cross-Bleed Valve 36-11-15 JB2-D Pin 7B, 7E, 7J Test Point 47
JB2-D Pin 7C, 7F, 7H Test Point 44
K10
JB2-D Pin 6C (Relay X1) Test Point 86
JB2-D Pin 7D (Relay X2) Test Point 75
JB2-D Pin 13J (Relay A1, B3) Test Point 81
JB2-D Pin 6C (Relay A2) Test Point 86
JB2-D Pin 13H (Relay A3, B1) Test Point 84
JB2-D Pin 6F (Relay B2) Test Point 65
JB2-D Pin 6E (Relay C2) Test Point 78
JB2-D Pin 7A (Relay C3) Test Point 50
JB2-D Pin 6D (Relay D2) Test Point 72
JB2-D Pin 7G (Relay D3) Test Point 53
K12
(Relay X1) Test Point 17
JB2-D Pin 6A (Relay X2) Test Point 1
(Relay A2) Test Point 4
JB2-D Pin 6C (Relay A2) Test Point 86
(Relay A3) Test Point 7
JB2-D Pin 6G (Relay B1) Test Point 13
JB2-D Pin 7D (Relay B3) Test Point 75
(Relay Y1) Test Point 20
JB2-D Pin 6A (Relay Y2) Test Point 1
K13
(Relay X1) Test Point 4
JB2-D Pin 6B (Relay X2) Test Point 28
(Relay B1) Test Point 20
JB2-D Pin 6C (Relay B2) Test Point 86
(Relay B3) Test Point 17(Relay Y1) Test Point 7
JB2-D Pin 6B (Relay Y2) Test Point 28		 Relays K10, K12, K13
Terrain Avoidance & Warning Power & Indication 34-42-01
34-42-09		 JB2-D Pin 7K, 8B, 8A, 8C Test Point 41
JB2-D Pin 8D Test Point 56
JB2-D Pin 8F Test Point 59
JB2-D Pin 8E Test Point 52		 Diodes CR34, 35
Ice Detection System Control 30-81-05 JB2-D Pin 9C, 9E, 9D Test Point 71 None
Air Conditioning Right Bleed 21-61-21 JB2-D Pin 9G (Relay X1, B2) Test Point 19
JB2-D Pin 9H (Relay X2) Test Point 22
JB2-D Pin 9F, 9J (Relay B3) Test Point 25		 Relay K68
Global Position System Configuration 34-55-03 JB2-D Pin 14F, 14K, 14H Test Point 98 ARINC Hi
JB2-D Pin 14G, 15A, 14J Test Point 101 ARINC Lo		 L-GPS-2 BUS
Air Conditioning System Right Pressure Sensor 21-61-21 JB2-E Pin 32, 30, 28, 26, 27, 29, 31, 33 Test Point 2 None
Flight Management System 34-61-07 R-FMC-2
JB2-D Pin 15B, 15E, 15H Test Point 91 ARINC Hi
JB2-D Pin 15C, 15F, 15J Test Point 94 ARINC Lo		 R-FMC-2
Air Data Computer Signal O/P 2 34-13-09 JB2-D Pin 11F, 11H, 11K Test Point 97 ARINC Hi
JB2-D Pin 11G, 11J, 12A Test Point 100 ARINC Lo		 R-ADC-2
EICAS DCU Interface 31-41-03 JB2-D Pin 12K, 12F, 12H Test Point 92 ARINC Hi
JB2-D Pin 13A, 12G, 12J Test Point 95 ARINC Lo		 None
EICAS Power & Indication 31-41-13 JB2-E Pin 37, 38, 39, 40 Test Point 14 None
EFIS Control 31-61-05 JB2-E Pin 41, 42, 43 Test Point 11 None
Flap Power System 27-52-33 JB2-E Pin 54, 55, 56, 57, 58 Test Point 5 K168
Field Loadable Software, Air Data Computer, Data Download Switch 25-72-27
25-72-23
34-55-01		 K158
JB2-E Pin 59 (Relay X1) Test Point 87
JB2-E Pin 60 (Relay X2) Test Point 49
JB2-D Pin 6K (Relay A1) Test Point 55
JB2-D Pin 6J (Relay A2) Test Point 52
JB2-D Pin 8G (Relay A3) Test Point 58
JB2-D Pin 8J (Relay B1) Test Point 61
JB2-D Pin 8H (Relay B2) Test Point 65
JB2-D Pin 10B (Relay C1) Test Point 83
JB2-D Pin 10A (Relay C2) Test Point 80
JB2-D Pin 10C (Relay C3) Test Point 67
JB2-D Pin 10E (Relay D1) Test Point 74
JB2-D Pin 10D (Relay D2) Test Point 77
JB2-D Pin 10F (Relay D3) Test Point 70		 Relay K158
Horizontal Stab Trim Control System Power 27-41-03 JB2-D Pin 11B, 11D, 12B Test Point 75 ARINC Hi
JB2-D Pin 11C, 11E, 12C Test Point 79 ARINC Lo		 ARINC Information
Cabin Pressure System Outflow Valve 21-31-05 Out Flow Valve ARINC 1
JB2-D Pin 12D, 13B, 13D Test Point 93 ARINC Hi
JB2-D Pin 12E, 13C, 13E Test Point 96 ARINC Lo
Out Flow Valve ARINC 2
JB2-D Pin 13F, 13K, 14B, 14D Test Point 99 ARINC Hi
JB2-D Pin 13G, 14A, 14C, 14E Test Point 102 ARINC Lo		 Dual Outflow ARINC Information

Junction Box 2, Board 2

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Rudder Pedal Adjust 27-21-25 JB2-A Pin 11A, 11C, 11B Test Point 1
JB2-A Pin 11D, 11F, 11E Test Point 2
JB2-A Pin 11G, 11J, 11H Test Point 3		 None
Fuel Computer System Refuel / Defuel 28-23-13 JB2-A Pin 13B (Relay X1) Test Point 52
JB2-A Pin 13C (Relay X2) Test Point 58
JB2-A Pin 12G, 12H, 12K, 13A, 13E (Relay A1) Test Point 44
JB2-A Pin 12C, 12F (Relay A2) Test Point 46
JB2-A Pin 12D (Relay B1) Test Point 55
JB2-A Pin 12E (Relay B2) Test Point 49

JB2-A Pin 12J, 14E, 13D Test Point 31
JB2-A Pin 14D, 14C, 13F Test Point 37
JB2-A Pin 13J, 14A, 13G Test Point 40
JB2-A Pin 13K, 14B, 13H Test Point 34		 Relay K1
Flight Management System Bus Left 34-61-03 JB2-D Pin 3D, 3H, 4B Test Point 79 ARINC Hi
JB2-D Pin 3E, 3J, 4C Test Point 82 ARINC Lo		 L-FMC-2 Bus
AHRS Computer #2 34-21-05 JB2-E Pin 1, 3, 2 Test Point 7 None
Interior Baseline Provisions 33-43-07 JB2-E Pin 7, 8, 9 Test Point 4
JB2-E Pin 10, 11 Test Point 12		 None
Audio Integration System Copilot 23-51-06 JB2-A Pin 14K, 15B, 15A Test Point 13
JB2-A Pin 15C, 15E, 15D Test Point 10		 None
Flight Management System 34-61-07 L-FMC-6
JB2-D Pin 1B, 1F, 2D Test Point 85 ARINC Hi
JB2-D Pin 1C, 1G, 2E Test Point 88 ARINC Lo
L-CDU-7 (Single FMS) R-CDU-6 (Dual FMS)
JB2-D Pin 2B, 2F, 2H, 1D, 2K, 3B, 1H Test Point 80 ARINC Hi
JB2-D Pin 2C, 2G, 2J, 1E, 3A, 3C, 1J Test Point 83 ARINC Lo		 L-FMC-6, L-CDU-7, R-CDU-6
General Radio Tuning Nav Right System 23-51-24 RA-RIU-7
JB2-D Pin 4F, 4K, 4H Test Point 86 ARINC Hi
JB2-D Pin 5A, 4G, 4J Test Point 89 ARINC Lo
RA-RIU-8
JB2-D Pin 5B, 5H, 5E Test Point 81 ARINC Hi
JB2-D Pin 5C, 5J, 5F Test Point 84 ARINC Lo		 RA-RIU-7, RA-RIU-8 Bus
Autopilot System Aileron Servo 22-11-17 JB2-A Pin 14J, 15F, 15G Test Point 8 None
Cabin Pressure System Outflow Valve 21-31-05 JB2-A Pin 15H, 15J, 15K, JB2-D Pin 1A Test Point 5 None
Audio Integration System Interconnect 31-61-05 RB-RIU-14
JB2-D Pin 1K, 3F, 3K, 4D Test Point 87 ARINC Hi
JB2-D Pin 2A, 3G, 4A, 4E Test Point 90 ARINC Lo		 RB-RIU-14 Bus
Horizontal Stab Trim Control System 27-41-03 JB2-E Pin 4, 5, 6, 12 Test Point 11 None
Reserved for DCP 692 JB2-E Pin 13, 14, 15, 16 Test Point 20 None
Autopilot System Power 22-11-06 JB2-E Pin 17, 18, 19, 20, 21, 22, 23 Test Point 17 None
ISI Battery Test 24-32-05 JB2-E Pin 24 (Relay X1) Test Point 16
(Relay X2) Test Point 32
JB2-A Pin 14G (Relay A1) Test Point 43, JB2-A Pin 14F (Relay A1) Test Point 40
JB2-E Pin 25 (Relay A2, & B2) Test Point 19
JB2-A Pin 12A (Relay A3) Test Point 25
JB2-A Pin 12B (Relay B1) Test Point 23
JB2-A Pin 14H (Relay B3) Test Point 28

Several Pieces can be individually tested in the timing circuit, here is the list of additional test points.
Resistor R1 Test Points 22 and 16
Zener Diode D1 Test Points 22 and 35
Resistor R2 Test Points 35 and 16
Resistor R3 Test Points 22, and 41
Diode D2 Test Points 22, and 38		 Relay K157, Diodes, Resistors and Capacitors

Junction Box 2, Board 3

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Cockpit Integral Lighting System 33-11-01 JB2-A Pin 1A, 1B, 1C Test Point 97 None
Lightning Detection Option System Interface 34-46-05 JB2-A Pin 2K, 3A Test Point 1 (CR36 Anode)
JB2-A Pin 3E, 3D Test Point 4 (CR36, CR13 Cathode)
JB2-A Pin 3B, Test Point 2 (CR13, CR11 Anode)
JB2-A Pin 3C Test Point 5 (CR11 Cathode)		 70_diode
ATC 2 Transponder 34-54-05 JB2-A Pin 3F, 3G, 3H, 3J, 3K, 4A, 4B, 4C, 4D, 4E, 4F, 4G, 4H, 4J, 4K, 5A, 5B, 5C, 5E, 5F, 5G, 5H, 5J, 5K Test Point 3 None
External Emergency Lighting System 33-51-17 JB2-B Pin 33, 34, 35 Test Point 10
JB2-B Pin 37, 39, 42 Test Point 8
JB2-B Pin 36, 40, 44 Test Point 17		 None
Interior Baseline Provisions, Drain Mast Heaters Interface 38-31-01 JB2-E Pin 7, 8, 9 Test Point 4
JB2-E Pin 10, 11 Test Point 12		 None
Audio Integration System Copilot 23-51-06 JB2-B Pin 45 (Relay K93, K95 X1, & B2) Test Point 35
JB2-B Pin 47 (Relay K93 X2) Test Point 31
JB2-B Pin 52 (Relay K93 A1) Test Point 34
JB2-B Pin 46 (Relay K93 A2) Test Point 37
JB2-B Pin 50 (Relay K93 B3) Test Point 28

JB2-B Pin 49 (Relay K95 X2) Test Point 38
JB2-B Pin 55 (Relay K95 A1) Test Point 41
JB2-B Pin 48 (Relay K95 A2) Test Point 39
JB2-B Pin 53 (Relay K95 B3) Test Point 43		 Relay K93, K95
EICAS DCU Interface 31-41-03 A-DCU-2
JB2-A Pin 6B, 6F, 6K, 6H, 6D Test Point 51 ARINC Hi
JB2-A Pin 5C, 5G, 6E, 7A, 5J Test Point 54 ARINC Lo		 A-DCU-2
EICAS RDC Interface 31-41-11 B-DCU-4
JB2-A Pin 8K, 9B, 9D, 9H, 9K Test Point 67 ARINC Hi
JB2-A Pin 9A, 9C, 9E, 9J, 10A Test Point 70 ARINC Lo
B-DCU-5
JB2-A Pin 9F, 10B, 10E Test Point 73 ARINC Hi
JB2-A Pin 9G, 10C, 10F Test Point 76 ARINC Lo		 B-DCU-4, B-DCU-5 Bus
Integrated Avionics Processing System 31-45-04 R-GP-4
JB2-A Pin 7B, 7D, 7F, 7H, 7K, 8B, 8D, 8F, 8H Test Point 62 ARINC Hi
JB2-A Pin 7E, 7G, 7C, 7J, 8A, 8C, 8E, 8G, 8J Test Point 65 ARINC Lo		 R-GP-4
General Radio Tuning IAPS 23-51-28 R-CDU-1
JB2-A Pin 1D, 1M, 1K, 2F Test Point 68 ARINC Hi
JB2-A Pin 1E, 1J, 2A, 2G Test Point 71 ARINC Lo
L-RIU-12
JB2-A Pin 1F, 2B, 2D Test Point 74 ARINC Hi
JB2-A Pin 1G, 2C, 2E Test Point 77 ARINC Lo		 R-CDU-1, L-RIU-12
Pilot & Copilot Emergency Audio 23-51-03 JB2-A Pin 2H, 2J, 6A, 10H, 10J, 10K Test Point 7 None

Junction Box 2, Board 4

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Flight Data Recorder System 31-31-01 JB2-F Pin 1G, 1H, 1J Test Point 25
JB2-F Pin 1E, 1B, 1D, 2G (Relay K40 B2) Test Point 16
JB2-F Pin 1A, 1C (Relay K40 B3) Test Point 94		 Relay K40
Cockpit Voice Recorder System 23-71-01 JB2-B Pin 24, 23, (Relay K40, K41 X1) Test Point 85
JB2-B Pin 26 (Relay K40 X2) Test Point 91
JB2-B Pin 25 (Relay K41 X2) Test Point 100
JB2-B Pin 1F (Relay K41 A1) Test Point 97
(Relay K40 A1, Relay K41 A2) Test Point 99
JB2-F Pin 2F (Relay K40 A2) Test Point 13
JB2-B Pin 50 (Relay K93 B3) Test Point 28		 Relay K40, K41
Satellite Communications System 23-13-09 JB2-F Pin 2E (Relay K40, C2) Test Point 88
JB2-F Pin 2D (Relay K40, C3) Test Point 19		 Relay K40
Autopilot System Yaw Damper Actuator 22-22-01 JB2-F Pin 1K, 2B, 2A Test Point 22
JB2-F Pin 2C, 5D, 5E Test Point 10		 None
Integrated Avionics Processing System 31-45-02 R-GP-1 JB2-F Pin 6B, 6D, 6F, 6H, 6K Test Point 49 ARINC Hi
JB2-F Pin 6C, 6E, 6G, 6J, 7A Test Point 52 ARINC Lo		 R-GP-1
Electrical Flight Instrumentation System Right PFD Bus 31-61-36 R-PFD-3 JB2-F Pin 7B, 7D, 7F, 8K Test Point 55 ARINC Hi
JB2-F Pin 7C, 7E, 7G, 9A Test Point 58 ARINC Lo		 R-PFD-3
Interior Baseline Provisions, Lighting Interface Electrical System 33-43-07 JB2-F Pin 3A (Relay X1) Test Point 90
JB2-F Pin 3B (Relay X2) Test Point 89
JB2-F Pin 2K (Relay A1) Test Point 86
JB2-F Pin 3C (Relay A2) Test Point 93
JB2-F Pin 2J (Relay A3) Test Point 87		 Relay K110
Interior 25-14-05 JB2-F Pin 3F (Relay K112 X1) Test Point 81
JB2-F Pin 3G (Relay K112 X2) Test Point 82
JB2-F Pin 3E (Relay K112 A1) Test Point 80
JB2-F Pin 3H (Relay K112 A2) Test Point 79
JB2-F Pin 3D (Relay K112 A3) Test Point 83

JB2-F Pin 4A (Relay K114 X1) Test Point 76
JB2-F Pin 4B (Relay K114 X2) Test Point 75
JB2-F Pin 3K (Relay K114 A1) Test Point 77
JB2-F Pin 4C (Relay K114 A2) Test Point 74
JB2-F Pin 3J (Relay K114 A3) Test Point 73

JB2-F Pin 4F (Relay K116 X1) Test Point 71
JB2-F Pin 4G (Relay K116 X2) Test Point 69
JB2-F Pin 4E (Relay K116 A1) Test Point 67
JB2-F Pin 4H (Relay K116 A2) Test Point 56
JB2-F Pin 4D (Relay K116 A3) Test Point 70

JB2-F Pin 5A (Relay K118 X1) Test Point 54
JB2-F Pin 5B (Relay K118 X2) Test Point 65
JB2-F Pin 4K (Relay K118 A1) Test Point 55
JB2-F Pin 5C (Relay K118 A2) Test Point 62
JB2-F Pin 4J (Relay K118 A3) Test Point 51		 Relay K112, K114, K116, K118
HF Communication System 23-12-02 Analog Mic
JB2-F Pin 8F, 8H, 7K Test Point 50 Hi
JB2-F Pin 8G, 8J, 8A Test Point 53 Lo

Analog Audio In
JB2-F Pin 8B, 8D, 7H Test Point 56 Hi
JB2-F Pin 8C, 8E, 7J Test Point 59 Lo		 None
Integrated Avionics Processing System 31-45-05 R-IOC-1
JB2-F Pin 9H, 9K, 10B, 10E, 10H Test Point 51 ARINC Hi
JB2-F Pin 9J, 10A, 10C, 10F, 10J Test Point 54 ARINC Lo		 R-IOC-1

Junction Box 2, Board 5

System Drawing Test Points:
Discrete = Black, ARINC = Blue		 Miscellaneous Equipment
Interior Baseline Provisions Lighting Interface 33-43-07 JB2-C Pin 3G, 3H, 3F Test Point 1 None
Integrated Avionics Processing 31-45-06 L-GP-5
JB2-C Pin 3J, 4A, 4C, 4E, 4J, 4G, 5B, 5D, 5F Test Point 2 ARINC Hi
JB2-C Pin 3K, 4B, 4D, 4F, 4H, 5A, 5C, 5E, 5H Test Point 3 ARINC Lo		 L-GP-5
Engine ID & Secondary Systems Selection Data Right 73-31-03 RA-FADEC-1
JB2-C Pin 7K, 8B, 8F, 8D, 8H, 8K Test Point 4 ARINC Hi
JB2-C Pin 8A, 8C, 8G, 8E, 8J, 9A Test Point 5 ARINC Lo		 RA-FADEC-1
Engine ID & Secondary Systems Selection Data Right 74-31-03 JB2-B Pin 1, 2, 3, 4 Test Point 5 None
General Radio Tuning Emergency Frequency Selection 31-61-15 JB2-B Pin 5, 8, 11, 13 Test Point 7
JB2-B Pin 6, 9, 12, 15 Test Point 8
JB2-B Pin 7, 10, 14 Test Point 9		 None
PMAT Connections between cards 45-45-07
45-45-05		 None None
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