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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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Quick Links

11/21/25

Message Overview:

Message Name:

L WSHLD SENSOR/WIRING [OPEN]

Message Code:

3040019IN

Associated CAS:

L WSHLD HEAT FAIL
(Caution)

Reporting LRU: Left Windshield Temperature Controller (WTC)
System Description: 30-41-00 - Windshield And Side Window Anti Icing
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 30-41-00 - Windshield Temperature Control System - Electrical Schematic  
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 30-41-01 - Windshield And Side Window Anti Icing Temperature Control

Message Description:

The Left Windshield Sensor has been detected Open circuit (sensor resistance ≥600±60 ohms).

Possible Causes:

  • Left Windshield Temperature Sensor (HR9)
  • Associated Wiring
  • Left Windshield Temperature Controller (L WTC) (A164)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

  • There are three temperature sensors installed between the plies of each windshield and side window, one for control and monitoring and two spares.

Quick Links:

Removal of the Windshield and Side Window Temperature-Controller AMM 30-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Windshield and Side Window Temperature-Controller AMM 30-41-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Windshields AMM 56-10-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Windshields AMM 56-10-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Remove all connectors from the left WTC. Inspect connectors and pins for damage/defects.

    1. If no defects or damage is found, reconnect the WTC connectors and continue with next step.
    2. If defects or damage is found, repair/rectify as required.

  2. Perform wiring checks between Left Windshield Temperature Sensor (HR9 S1) and L WTC (A164P1). Repair as required.

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

  3. Measure the temperature sensor resistance (refer to Windshield and Side Window Temperature Sensor Resistance Chart).

    1. If resistance within range, go to step 5.
    2. If resistance out of range, continue with the next step.

  4. Connect spare temperature sensor on left windshield (HR9/ S2 or S3).

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

  5. Interchange WTCs.

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

  6. Replace Windshield.
  7. Do close out.

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