For 1990-2009 cars

# BCM EPROM CALIBRATIONS - SUMMARY OF SERVICE EPROMS

#### 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 following 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 ----------------- BCM Service EPROM Broadcast PROM Year P/N P/N Code I.D. Use Bulletin ---- ------- ----- --------- ---- --- -------- 1985 1226464 16043729 CLW 10 gas 16040601 DDM 11 gas T-85-22 16053562 HRY 13 gas T-85-86 01228026 HRY 14 gas T-85-86A 1986 1226464 16062532 AAPT 20 gas T-85-86A 1987 1226464 16065445 AATF 21 gas 16065449 AATH 221 limo

1988 1226464 16083257 AHSA 22 16120512 AMXN 23 gas 16122026 ANAU 24 gas T-89-95 16122030 ANAW 224 com. chassis T-89-95

1989 1228784 16122557 AHSC 16122561 AHSD 30 16138772 ARZT 31 T-89-95

1990 16130754 16144216 ARFD 41 1991 16130754 16158704 AWXR 57 16164048 AYBJ 58 T-91-100 16172467 AZYF 59 see note T-92-30 16183894 BCSL 50 see note T-92-30A

1992 16130754 16170410 AZFR 66 16173349 BAAT 67 see note T-92-30 16183880 BCRS 68 see note T-92-30A/ T-92-130

1993 16130754 16183880 BCRS 68

#### Bulletin Description:

T-85-22, Group 6C: Incomplete fuel fill. T-85-86A, Group 1: Insufficient 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.

* Retained accessory power timer calibration

#### Allante

BCM Red Gray Service EPROM EPROM Broadcast PROM Year P/N P/N P/N Code I.D. Bulletin ---- ------- ----- ----- --------- ---- -------- 1987 1227751 16071807 16071804 ACLJ 9396 16074487 16074484 AFRA 4416

1988 1228171 16089573 16089568 AMRP 9486

1989 1228785 16129737 16129727 ANZX 9726 16133916 16133913 APYL 3436

1990 1228785 16143840 16143836 ATCJ 3446

1991-2 1228785 16154480 16154473 AWCT 4476

1993 16152735 16177286 16177283 BAYY 7236 16185968 16185967 BCXW 4146 T-93-7A

#### 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

BCM Service EPROM Broadcast PROM Year P/N P/N Code I.D. Bulletin ---- ------- ----- --------- ---- -------- 1986 1227333 16059147 ATC 7296 16061814 AAAZ 0406 16068128 ABPU 8128 86-P-1 01228418 ABPU 8418 87-C-1 01228483 ABPU 8483 16140207 ASLN 0206 T-89-103A

1987 1227333 16070372 AATL 4836 16075605 AFUM 5456 87-C-1 16140210 ASLP 0216 T-89-103A

1988 1227333 16080212 AJUT 0186 16128252 ANUD 8256 16139065 ASCD 9066 T-89-103A 16151993 AUPL 1996 T-90-101

1989 1228786 16123760 ANDP 3776 16133928 APYK 3426 16138881 ASAP 8766 T-89-103 16145908 ATPU 5916 T-90-17 16151037 AUKN 1046 T-90-101

1990 1228786 16132342 ANXX 9236 16151314 AUKP 1056 T-90-101

1991 1228786 16153166 AUUY 5996 16156476 AWNF 6416 16164604 AYDR 4607 T-91-87

#### 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.

** Canadian fuel economy calibration

*** Allowed heated windshield option

Parts are currently available from GMSPO.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.