W DOC AIRBUS | TSM A320F

Lavatory Signs - The Toilet Occupied Symbol in the Cockpit does not come on

TASK 33-26-00-810-803-A
Lavatory Signs - The Toilet Occupied Symbol in the Cockpit does not come on

1. Possible Causes
  • ANN-TOILET/OCCPD [6WJ]
  • LAMP
  • BOARD-ANN LT TEST & INTFC [18LP]
  • WIRING
  • C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ]
  • MICRO SWITCH LAVATORY [2WJ]
  • RELAY-OCCUPIED (18LP),
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 33-26-00-710-001
Operational Test of the Lavatory Lighted Signs WJ
ASM 332601
3. Fault Confirmation
Subtask 33-26-00-710-054-A
A. Do the operational test of the Lavatory Lighted Signs AMM 33-26-00-710-001.
4. Fault Isolation
Subtask 33-26-00-810-059-A
A. If the test shows that the ANN-TOILET/OCCPD [6WJ] does not come on:

NOTE: Be sure that the FWD lavtory door is closed and engaged.

   (1) If there is 28 VDC:
  • replace the LAMP
   (2) If there is no 28 VDC:
  • replace the BOARD-ANN LT TEST & INTFC [18LP]
     (a) If the fault continues:
  • do a check and repair the WIRING between:

    C/B-LAV FWD-OCCUPIED or C/B-LAV FWD & MID-OCCUPIED [1WJ] and MICRO SWITCH LAVATORY [2WJ] pin C,
    MICRO SWITCH LAVATORY [2WJ] pin NO and BOARD-ANN LT TEST & INTFC [18LP] pin 21
    RELAY-OCCUPIED (18LP), pin 45 and ground,
    RELAY-OCCUPIED (18LP), pin 10 and ANN-TOILET/OCCPD [6WJ] pin 7,
    ASM 332601
Subtask 33-26-00-710-055-A
B. Do the test as given in the Para. 3. A.
5. Close-up
Subtask 33-26-00-860-052-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:31:56 UTC
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