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GM COMPUTER
BOX LOCATIONS AND CODES
This is a list
of computer locations, and example box 3 or 4 digit codes. These are
purely examples as our database of codes is far to big to list them all.
If your box code is not listed here it doesn't mean we cannot make a
chip, simply email us, give us a call at 403-377-2277 or fax us at 403-377-2270 (24 hours)--have your code ready !
WHAT FOUR LETTER
CODE DO WE NEED FOR THE PROM or MEMCAL?
Click
HERE to
view diagram (click on lower right corner icon to enlarge)
Check the bottom of the page for easy
PROM and Memcal removal procedures and installation. Some performance
memcals will be piggy backed to an adapter. Pay attention to
installation procedures--and always use this page as a guideline.
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Vehicle |
Box Location |
Example Codes |
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Buick Century |
Behind the glove box |
BDYC |
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Buick Electra |
Behind the glove box |
4 letters beginning with A or B |
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Buick Grand National |
Passenger side kick panel |
BBKJ |
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Buick Le Sabre |
Behind the glove
box -- remove under dash panel to access |
4 letters beginning with A or B |
|
Buick Park Ave |
Behind the glove box |
4 letters beginning with A or B |
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Buick Reatta |
Behind the glove box |
4 letters beginning
with A or B |
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Buick Regal |
Pre 94 Passenger kick panel Post 94
Under hood |
AXDN, ASHZ, AZKJ, AJSA |
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Buick Riviera |
Behind the glove box |
4 letters beginning with A or B |
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Buick Road Master |
Behind the glove box |
4 letters beginning with A or B |
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Buick Sky Hawk |
Behind the glove box |
4 letters beginning with A or B |
|
Buick Skylark |
Behind the glove box |
4 letters beginning with A or B |
|
Cadillac and Northstar |
Under the dash towards firewall on
passenger side |
AZYD, BBAW, BCRN, AZCY |
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Chevy Astro Van |
Passenger side kick panel |
4 letters beginning with A or B |
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Chevy Beretta |
Under the dash passenger side |
AMAN, AJAB, ATDS, ACSY |
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Chevy Blazer |
Under the dash passenger side |
BARL, AMRU, ACTW, ANRW |
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Chevy Camaro Pre 1994 |
Under the dash passenger side |
ACXT, ANTT, BDLD, BDLF |
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Chevy Camaro 1994-2002 |
Under the hood passenger side |
VIN Needed |
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Chevy Caprice |
Under the hood drivers side |
BKNF, BKBW, ATYR |
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Chevy Cavalier |
Under the hood passenger side |
BATX, AXDU, AXDY |
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Chevy Celebrity |
Behind the glove box |
4 letters beginning with A or B |
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Chevy CK 1500, 2500, 3500 |
Behind the glove box 1987-1995 -- remove
glove box liner, remove electrical connectors, slide ECM to the left
and out |
ANLW, ASDU, ASDX, BDJL, BJYL, etc... |
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Chevy Corsica |
Behind the glove box |
4 letters beginning with A or B |
|
Chevy Corvette |
Passenger side
under the dash |
AXCR, BAFL, BAFN |
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Chevy Express |
Behind the glove box |
4 letters beginning with A or B |
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Chevy Impala SS |
Under the hood behind drivers headlight |
BLPR, BSDS, BCSY |
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Chevy Lumina |
Under the hood passenger side |
BFRS, BHAK, AUBU |
|
Chevy or Pontiac F body |
Under passenger side dash 1986-1993 |
AUJP |
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Chevy Monte Carlo |
Passenger side kick panel |
BKLL |
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Chevy S10 |
Behind the glove box--remove glove box
liner, remove connectors, slide PCM to the left and out |
AMRU, BARL, BCTW |
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Chevy Tahoe |
Behind the glove box -- remove glove box
liner |
4 letters beginning with A or B |
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Chevy TBI Vans |
Behind panel / rearward of drivers' seat |
BPSA, ACUN, ARJT |
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Chevy Yukon |
Behind the glove box -- remove glove box
liner |
4 letters beginning with A or B |
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Chevy Z-34 |
Under the hood
passenger side -- remove glove box liner |
4 letters beginning with A or B |
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GMC Sonoma |
Under the dash passenger side |
ATKN, AZUS, BCZP |
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GMC Suburban |
Behind the glove box |
AXHJ, BASB, BANA, BAMP |
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GMC Syclone |
Behind the glove box |
AYBN, BBZA |
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GMC Typhoon |
Behind the glove box |
AYBN, BBZB |
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Oldsmobile |
Passenger side kick panel--some under
hood right side |
BMRY, AZJZ, BHFH, AXDN |
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Pontiac 6000 |
Behind the glove
box -- Access from under dash. Remove panel 7mm screws |
4 letters beginning with A or B |
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Pontiac Bonneville |
Behind the glove box -- Usually easier
to access from under dash |
AYZB, ANWB, BHDZ, AZKN |
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Pontiac Fiero |
Rearward of center console between the
seats |
AKYN, ALWM |
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Pontiac Firebird |
Pre 94 Under right side dash Post 94
Under hood passenger side |
ABWC, APYU, AUJM, AKXY |
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Pontiac Le Mans |
Behind the glove box |
4 letters beginning with A or B |
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Pontiac Grand Am |
Passenger side kick panel
|
BAKJ, BDBR, BFZW |
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Pontiac Grand Prix |
Under the hood passenger side |
BKXA, ARHL, ATYY |
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Pontiac Sunbird |
Behind the glove box |
4 letters beginning with A or B |
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GM Trucks 1996-2000 |
All are under the hood--Black finned box
4-5 connectors. All have knock module under the cover which must be
swapped with replacement PCM |
Need VIN number |
|
GM Silverado Trucks 1999-2006 |
All are under the
hood, vertical on frame behind black plastic cover, between battery
and radiator -- Aluminum box clipped to holder with
two harness connectors and 7mm bolt in each retaining them |
Need VIN number |
|
Trailblazer 2002-2004 |
PCM bolted to
engine block drivers' side. 10mm nuts on studs, 10mm bolts 3
connectors with 7mm centre bolts retaining the connectors |
Need VIN number |
Chip BCC "codes" are located
on the white paper label that's stuck to the computer. You can also find
the chip code by removing the lid from the computer (two 1/4" screws)
and checking what letter code is on the silver or white label attached
to the Memcal or Prom chip. Once we have those letters, we can program
your chip. When calling or Emailing an order we need to know the
computer code, year, make and model of your car, the engine size and any
after market parts you may have added already--remember our performance
chips are computer code specific--that's why they're the best !!
If there's no removeable
chip, it's newer than 1992 and it's a "flash" only computer, and we'll
need your VIN number to send you a complete
performance computer.
HOW to REMOVE the
PROM (1982 Cars through -1992 Trucks)

To get the PROM out of the holder,
gently squeeze the sides of the chip holder. As you squeeze the sides
(where the little chip legs reside), the PROM legs should pop loose from
the holder and self extracate from the holder. If the chip fails to pop
out, gently pry the legs individually with something sharp (razor
blade, electronics screwdriver, etc...) but again--BE CAREFUL. Note the
notch in the holder (square) and notch in the chip (rounded). When
re-installing the performance chip in the holder, the chip notch must be
at the same end as the holder notch !!!!

If you were supplied an ECU with a
socket, the chip notch must align with the socket notch.
When re-installing your performance
chip, make sure that the notch from the PROM aligns with the notch in
the HOLDER (or socket when equipped). IT is impossible to install the
holder backwards in the ECU socket--it has indexing notches to prevent
this...but installing the PROM backwards in the holder, and turning the
key on will render it unuseable. We do not ship performance chips with
holders or sockets--the "holder" is no longer being manufactured, so you
must use your old one. Should you require one, we have them in stock.
If your factory chip has a
'holder'--you MUST REUSE the holder !!!
For MEMCAL
installation,
refer to this
procedure:
1. Disconnect the
vehicle battery negative cable. Remove the kickpanel/glovebox/or other
to access the computer. Disconnect the connectors at the computer and
remove the computer. Remove the computer memcal cover via two 1/4"
screws. Lift off the cover. Underneath you'll see a blue cover with a
label or decal identifying the chip calibration. Some do not have a
label--the BCC CAL ID (4 digit code) is printed directly on the blue
cover in black ink. Under the cover is an ESC (Electronic Spark Control)
module to the left in the below picture. The right side has the Eprom--which
usually has a decal over the quartz window of the chip. This could be in
number format or letter format--we need the letter format. The below
picture shows the factory memcal installed in the factory computer. The
memcal code and label code should match. If not--let us know what the
SERVICE number (8 numbers) and 4 digit code are so we can verify your
calibration as GM may have installed an updated code. We always like to
work from the updates.

2. Remove the Blue covered memcal from
the computer. If we supplied you an exact duplicate memcal, it installs
EXACTLY as you removed the factory memcal. Do not attempt to install it
backwards, upside down or inside out. Sometimes we supply a performance
chip installed to what we call a "memboard". This is a
piggy-back device that interrupts and supplies our performance program,
and yet still uses the ESC module section of the original memcal.

3. Note the row of pins beside the chip
on the memboard--these slide into the original MEMCAL that was in your
computer. Make sure you slide the pins of the memboard in the beginning
slots of the memcal, or you will be mispositioning the memcal/memboard
installation. This picture shows the proper installation of the 'memboard'
to the 'memcal'.
If you fail to install the two
components correctly, you may have a running vehicle with no spark
control (fixed base timing--no timing advance).
 
4. This shows the correctly installed
assembly in the computer. Re-install the lid and install the computer
back in the vehicle. Reconnect the battery and start. The vehicle may
not run correctly for the first initial start-up attempts until it has
relearned fuel mapping and knock control. Some transmissions also have
relearn adaptives which must have drive time for relearn to occur.

Correctly installed in
computer.
5. Reinstall the cover, reconnect the
wiring to the vehicle computer, reinstall the PCM securely to its'
holder and reconnect the battery. Turn on the key and note the check
engine light. It will flash ONCE and remain on steady. Start the engine.
The check engine light will go out. If the check engine light is rapidly
flashing or on steady--you've installed the memcal/memboard incorrectly,
or have a bad computer socket connection. Recheck the above procedures.
If you have further questions or
problems--contact us 1-888-WESTER-1.
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