_
 - do a check and repair as necessary the wiring between all WDBs (50MKx) from the WDB (50MKx) that serves the SEB (100MKxx) in the seat row XX and the WBD (50MKx) that serves the SEB (100MKxx) in front of seat row XX (Ref. ASM 23-33/02):

 - the WDB (50MKx) connector A/13 and the WDB (50MKx) connector D/13.

 - the WDB (50MKx) connector A/14 and the WDB (50MKx) connector D/14.

 - the WDB (50MKx) connector A/15 and the WDB (50MKx) connector D/15.

 - the WDB (50MKx) connector A/8 and the WDB (50MKx) connector D/8.

 - the WDB (50MKx) connector A/1 and the WDB (50MKx) connector D/1.

 - the WDB (50MKx) connector A/2 and the WDB (50MKx) connector D/2.

 - do the Test of the Passenger Entertainment (Music) MK (Ref. AMM TASK 23-33-00-740-002).

 a If the test gives a different maintenance message
_ 23-33-54/BUS XXYYL:
 - continue with para. 4.B.(2).
 8 If the fault continues:
_
 - do a continuity check on all SEBs (100MKxx) on the left side of the cabin from the seat row in front of the seat row XX to the seat row next to the WDB (50MKx) that serves the SEBs (100MKxx) above between:
 - the SEB (100MKxx) connector J1/6 and the SEB (100MKxx) connector J2/6.
 a If there is no continuity:
_
 - replace that/these SEAT ELECTRONIC BOX(es) (100MKxx) above (Ref. AMM TASK 23-33-46-000-001) and (Ref. AMM TASK 23-33-46-400-001).
 b If the BITE test (part of installation procedure) gives a
_ different maintenance message 23-33-54/BUS XXYYL:
 - continue with para. 4.B.(2).
 9 If the fault continues:
_
 - do a check and repair as necessary the wiring between the checked SEBs (100MKxx) in front of the seat row XX (Ref. ASM 23-33/03):

 - the SEB (100MKxx) connector P1/6 and the SEB (100MKxx) connector P2/6.

 - do the Test of the Passenger Entertainment (Music) MK (Ref. AMM TASK 23-33-00-740-002).

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 106-149, 201-299, 301-399, ∞∞23-33-00∞∞∞∞∞∞∞∞∞∞Page 206
 May 01/05 CES a If the test gives a different maintenance message

_ 23-33-54/BUS XXYYL:
 - continue with para. 4.B.(2).
 10 If the fault continues:
__
 - do a check and repair as necessary the wiring between the SEB (100MKxx) nearest to the WDB (50MKx) that serves the checked SEB (100MKxx) and that WDB (50MKx) (Ref. ASM 23-33/03):

 - the WDB (50MKx) connector P1/6 and the SEB (100MKxx) connector P2/6.

 - the WDB (50MKx) connector P1/9 and the SEB (100MKxx) connector P2/9.

 - the WDB (50MKx) connector P1/5 and the SEB (100MKxx) connector P2/5.

 - the WDB (50MKx) connector P1/7 and the SEB (100MKxx) connector P2/7.

 - the WDB (50MKx) connector P1/8 and the SEB (100MKxx) connector P2/8.

 - do the Test of the Passenger Entertainment (Music) MK (Ref. AMM TASK 23-33-00-740-002).

 a If the test gives a different maintenance message
_ 23-33-54/BUS XXYYL:
 - continue with para. 4.B.(2).
 11 If the fault continues:
__
 - replace the SEAT ELECTRONIC BOX (100MKxx) in the seat row XX on the left side of the cabin (Ref. AMM TASK 23-33-46-000-001) and (Ref. AMM TASK 23-33-46-400-001).
 a If the BITE test (part of installation procedure) gives a
_ different maintenance message 23-33-54/BUS XXYYL:
 - continue with para. 4.B.(2).
 12 If the fault continues:
__
 - replace the SEAT ELECTRONIC BOX (100MKxx) in the seat row in front of the seat row XX on the left side of the cabin (Ref. AMM TASK 23-33-46-000-001) and (Ref. AMM TASK 23-33-46-400-001).
 a If the BITE test (part of installation procedure) gives a
_ different maintenance message 23-33-54/BUS XXYYL:
 - continue with para. 4.B.(2).
 13 If the fault continues:
__
 - replace the WALL DISCONNECT BOX (50MKx) that serves the last replaced SEB (100MKxx) (Ref. AMM TASK 23-33-47-000-001) and (Ref. AMM TASK 23-33-47-400-001).
 a If the BITE test (part of installation procedure) gives a
_ different maintenance message 23-33-54/BUS XXYYL:
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 106-149, 201-299, 301-399, ∞∞23-33-00∞∞∞∞∞∞∞∞∞∞Page 207
 May 01/05 CES

 - continue with para. 4.B.(2).

 14 If the fault continues and:
__
　
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