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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.

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03/16/21

Message Overview:

Message Name:

MLGWOW K159 OVLD FAULT

Message Code:

B3-230122

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: DL-K159; MLGWOW
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 25-72-23
32-61-09

Message Description:

Proximity Sensor Electronic Unit detects an overload condition on the discrete output to the L Dataload Relay - K159. Verify user interface, K159 and related wiring.

Possible Causes:

  • Relay (K159)
  • Junction Box JB1 Circuit-Card 1 (JB1-DB1)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Removal of the Junction Box JB1 Circuit-Cards AMM 24-63-01-000-803
Installation of the Junction Box JB1 Circuit-Cards AMM 24-63-01-400-803
Operational Test of Junction Box JB1 Card 1 AMM 24-63-01-710-805
Removal of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-000-801
Installation of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-400-801
Functional Test of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-720-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do wiring check from the JB1-DB1 connector JB1EP1 Pin 57 to the PSEU connector A9CP1 Pin 9B. Repair as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Replace the Circuit Board 1 of the Junction Box 1.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Replace the PSEU.
  4. Do close out.

proximity_sensor

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