INFORMATION ON IGNITION KEY AND LOCK CYLINDER CHANGES

SUBJECT: INFORMATION ON IGNITION KEY AND LOCK CYLINDER CHANGES

VEHICLES AFFECTED: 1993 "N" MODELS AND 1993 "J" CHEVROLET SERIES

General Motors has made styling and design improvements to the ignition keys and lock cylinder's. This change removes the center groove on each side of the key and shortens the outer groove by 8mm. (See Figure 1). Th old key blank (P/N 26018738) is interchangeable on both old and new lock cylinders. The new key blank is functional only in a new lock cylinder since internal lock modifications were made to accept the removal of the center key grooves. These changes were made in November of 1992 (1993 model year).

Dealers should continue to use the old key blank (P/N 26018738) on BOTH old and new lock cylinders to maintain interchangeability and to avoid changes in key cutter equipment.

LOCK CYLINDER PARTS INFORMATION:

When servicing of the lock cylinder is required, the following part numbers have been changed:

Parts Description Old Part # New Part #

1 . Lock cylinder for automatic 26037081 26039996 transaxle vehicles (includes 2 shear bolts)

2. Lock cylinder for manual 26037074 26039998 transaxle vehicles (includes 2 shear bolts)

KEY CUTTER PARTS INFORMATION

There is no need to change key cutter equipment since the key blank is not changing. If there is difficulty cutting ignition keys, please contact your local key cutter representative. Two suppliers are listed below, however, other suppliers may be contacted on an individual basis.

ILCO UNICAN 7301 Decarie Blvd Montreal. P.Q. H4P 2G7 PH: 514 735-5411

PART NAME ILCO P/N --------- -------- 1. Exacta with case 74-MKl -P26 2. 'J/N" car accessory 74-MK1-GM-AE-91

CURTIS INDUSTRIES, INC 6315 Danville Rd Mississauga, Ont LST 2H7 PH: 1-800 268-9939 416 795-0909

Part Name Description Curtis P/N ---------- ----------- ---------- 1. No. 15 Code Cutter 15W-45 19815 OR No. 15 Code Cutter 15W-38 20518

2. Cam Set GM-4 20514

3. Carriage GM-4A* 20515

4. Decoder Scale GM-4 20141

NOTE: NAES Dealers contact Technical Assistance.

Aftermarket suppliers may create a new key blank. Using this key blank can create interchangeability problems between old and new lock cylinders.

We believe this source and their equipment to be reliable. There may be additional manufacturers of such equipment. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or equipment from this firm or for any such item which may be available from other sources.

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.