BCM EPROM - Calibration Summary
Bulletin No.: T-93-112File in Group: 8
Number: 161
Corp.Ref.NO.: 818306R
Date: July 1993
SUBJECT:
BCM EPROM CALIBRATIONS
MODELS AFFECTED:
1985-1993 DE VILLES AND FLEETWOODS (FWD)
1986-1991 ELDORADOS AND SEVILLES
1987-1993 ALLANTES
This bulletin supersedes bulletin T-91-7 which should be discarded. This bulletin is being revised to include new model years and part numbers.
The charts summarize all of the EPROM calibrations made on 1985-1993 BCM equipped vehicles to date. When any diagnosis leads to BCM EPROM replacement, the latest service EPROM part number listed should be used. Should any additional EPROM calibration changes be made, the GMSPO parts distribution system will automatically supersede these service part numbers.
EPROM changes may be made for many different reasons. For instance, a calibration change may be made in conjunction with a components change for a repair relative to a current field condition, or as a running change to provide minor modifications affecting the Electronic Climate Control or other BCM controlled systems. Therefore, if an EPROM I.D. is different than that of the latest EPROM available it does not necessarily need replacement. Refer to the bulletin listed for details about the symptom that may require an EPROM change.
The broadcast code is on a sticker on the EPROM. The PROM I.D. is BCM parameter P3.1 on 1985-1990 DeVille/Fleetwood; parameter P3.3 on 1991-1993 DeVille/Fleetwood; and parameter BD99 on the Eldorado, Seville, and Allante.
IMPORTANT:
PROM and BCM are ESD sensitive. Refer to Section 8A-4-0 of any Cadillac 1993 Service Information Manual for handling procedures.
DeVille/Fleetwood
Bulletin Description:
T-85-22, Group 6C: Incomplete fuel fill.
T-85-86A, Group 1: Insufffcient cooling at idle (update).
T-89-95, Group 1: Service A/C light with F46/F47.
T-91-100, Group 1: ECC blower speed too high.
T-92-30, Group 1: HVAC temperature/air flow concerns.
T-92-30A, Group 1: HVAC temperature/air flow concerns.
T-92-130, Group 1: ECC controls too warm in heat mode.
NOTE:
Use these PROM's only if complete bulletin (including duct modification) has been performed. Otherwise, use previous listed PROM.
Allante
Bulletin Description:
T-93-7, Group 1: Intermittent BCM codes 446, 449, and 450.
NOTE:
Red and gray EPROM's must always be replaced as a matched set.
Eldorado and Seville
Bulletin Description:
86-P-1, Group 8: Special policy for shift indicator display, also includes washer fluid level
fix and HVAC calibration update.
87-C-1, Group 8: Headlight campaign.
T-89 -103A, Group 8: Clock gains or loses time.
T-90-17, Group 1: ECC controls too cold.
T-90-101, Group 8: B446, B447, and B448 code diagnosis.
T-91-87, Group 1: ECC system controls too cold.
Parts are currently available from GMSPO.