Relays and/or Lighting - Erratic Operation/Codes Set

Bulletin No. T 87-29
File in Group 8
Number 49
Corp. Ref. No. 618208
Date Nov. '86
SUBJECT: ERRATIC RELAY AND/OR LIGHTING OPERATION, CODES B334, B335, B336, B337, B446, B447, B448, B660, OR B663 SET

MODELS AFFECTED: 1986 ELDORADO AND SEVILLE

Figure 1 - BCM PROM:

Some 1986 Eldorados and Sevilles may experience erratic relay operation and/or flashing interior and flickering exterior lighting with the ignition in the "run" position possibly accompanied by codes B334, B335, B336, B337, B446, B447, B448, B660, or B663. This condition may be caused by an inoperative BCM PROM. BCM PROM's that may cause this condition can be identified by a white stripe or the manufacturer's code, 014, on the PROM (see Figure 1).
To correct this condition, replace the BCM PROM with P/N 16068128. Check replacement PROM's to be sure that they do not have a white strip or a manufacturer's code 014. These PROM's have been purged from GMWDD stock.

For warranty purposes use Labor Operation N4801 at .4 hours.