CAMPAIGN: D.I.C. DISPLAY MESSAGES NOT DISPLAYED

MODELS/YEARS: 1986 TORONADO

CONDITION

General Motors has determined that some 1986 Toronados may have been assembled with an incompletely programmed body computer module (BCM). As a result, the information center function of the electronic instrument cluster may not be capable of displaying the following driver information messages:

- A/C System Problem - Cruise Set At - Low Refrigerant - Cruise Problem - Generator Problem - Lighting Problem - Press System Monitor (With optional twilight To Silence Chime sentinel only)

To correct this condition, it will be necessary to replace the EEPROM in the BCM as described in the service procedure section of this campaign bulletin.

VEHICLES INVOLVED

Involved are certain 1986 Toronados within the following serial numbers:

Assembly Plant Beginning Up To And Including -------------- --------- ------------------- Hamtramck (U) Start of Production GU301144

DEALER ACTION

To correct this condition, dealers are to check for the absence of certain driver information messages on involved vehicles and, if necessary, install a replacement EEPROM. Dealers are to service all vehicles subject to this campaign at no charge to the owner, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or is in your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer and arrangements made to make the required modification according to instructions contained in this bulletin.

SERVICE PROCEDURE

A. Inspection ---------- 1. Raise hood and install fender covers.

2. Disconnect the low refrigerant temperature sensor connector from the low refrigerant temperature sensor. Refer to Figure 1.

3. Start engine and observe the Instrument Panel Driver Information Display.

- If the message "A/C System Problem" is displayed, the system is functioning properly. Turn engine off, reconnect the A/C temperature sensor and clear the malfunction code from the computer memory as described in Part B of this procedure.

- If there is no message displayed, it will be necessary to replace the EEPROM. Proceed to Part C of this service procedure.

B. Clear BCM Malfunction Code -------------------------- To clear BCM codes, prom the fan up (A) or fan down (V) buttons on the electronic climate control (ECC) panel (refer to Figure 2) as indicated in the following procedure while watching the instrument panel information display.

NOTE: If an incorrect button is pressed during this procedure, press the BI-LEVEL button to exit Diagnostics. Begin the procedure again by entering diagnostics as before.

START ENGINE AND ALLOW IT TO IDLE | | ENTER DIAGNOSTICS WAIT FOR WAIT FOR AFTER CODE BY PRESSING "OFF" ---> SEGMENT ---> DIAGNOSTIC ---> DISPLAY & "WARM" FOR 3 CHECK CODE ENDS SECONDS DISPLAY TO DISPLAY COMES....-| FINISH TO FINISH | | | |------------------------------------------------------------ | PRESS PRESS PRESS "ECM?" --> (V) --> "BCM?" --> (V) --> "BCM DATA?" --> (V) --| LO HI LO | "NO" "YES" "NO" | | | |------------------------------------------------------------------- | PRESS PRESS "BCM INPUTS?" --> (V) --> "BCM OUTPUTS?" --> (V) --> "BCM OVERIDE?" --| LO LO | "NO" "NO" | | |------------------------------------------------------------------- |

PRESS PRESS BCM CODES EXIT DIAGNOSTICS (V) --> "CLEAR BCM CODES?" --> (V) --> CLEARED --> BY PRESSING LO HI "BI-LEVEL" "NO" "YES" | | | PROCEED TO PART F OF SERVICE PRCEDURE

C. EEPROM Procurement ------------------

NOTE: The EEPROM contains specific vehicle information such as: Vehicle Identification Number, accumulated vehicle mileage, certain vehicle options, and other information. Due to this information, an EEPROM CANNOT be exchanged from one vehicle to another.

Replacement EEPROMS must be obrained through an authorized Delco Electronics Service Center. See "Authorized EEPROM Service Centers" listed in this bulletin.

1. Contact the nearest EEPROM Service Center.

2. Provide the service center with the following information when ordering a new EEPROM.

o Complete Vehicle Identification Number o Whether or not the vehicle was built for U.S. or foreign country operation (Z49)* o Whether or not the vehicle is equipped with twilight sentinel option (T82)* o Whether or not the vehicle is equipped with voice module option (UV1)* o Current mileage of vehicle

* Option codes are listed on the service parts identification label located on the inside of the trunk lid.

3. The replacement EEPROM will be received with a claim form from the Service Center. The claim form is to be completed by the dealership and returned to the Service Center with the malfunctioning EEPROM. One copy of the claim form is to be retained by the dealership and attached to the repair order. Failure to return the malfunctioning EEPROM with the claim form will result in the assessment of a $200.00 core charge.

Zone off ices will be notified of any EEPROMs not returned within 60 days. All replaced EEPROMs returned to the Service Center will be forwarded to Delco Electronics for evaluation and reading.

4. Proceed to Part D of this service procedure for EEPROM installation.

D. EEPROM Installation ------------------- 1. Open I.P. compartment door.

2. Disconnect stop straps.

3. Remove screws attaching door to hinge.

4. Remove I.P. compartment door.

5. Remove relay center bracket assembly and position aside.

6. Remove fuse panel and position aside.

7. With ignition switch off, remove electrical connectors from BCM and loosen nuts attaching BCM to bracket.

8. Remove BCM

9. Remove 4 screws from accen cover and remove cover. Refer to Figure 3.

10. Remove EEPROM as follows: Using the rocker type PROM removal tool (Figure 3), engage one end of the EEPROM carrier with the hook end of the tool. Press on the vertical bar end of the tool and rock the engaged end of the EEPROM carrier up as far as possible. Engage the opposite end of the EEPROM carrier in the same manner and rock this end up as far as possible. Repeat this process until the EEPROM carrier and the EEPROM are free of the EEPROM socket.

11. Install EEPROM mounted in carrier, in EEPROM socket. Small notch in carrier must be aligned with small notch in socket.Press on EEPROM carrier until it is firmly seated in the socket. Do not press on EEPROM; only the carrier.

NOTE: Care must be taken when installing the EEPROM to prevent damage.

12. Install access cover and secure with four screws.

13. Reinstall BCM (reverse Steps 1 through 7)

14. Proceed to Part E of this service procedure

E. Verify Driver Information Message --------------------------------- 1. Disconnect the low refrigerant temperature sensor connector from the low refrigerant temperature sensor. Refer to Figure 1.

2. Start engine and observe the Instrument Panel Driver Information Display.

3. Themessage "A/C System Problem" should display.

4. Turn engine off and reconnect low refrigerant temperature sensor.

5. Clear BCM malfunction code. Refer to Part B of this service procedure.

F. Campaign Identification Label -----------------------------

PARTS INFORMATION

When required a EEPROM is to be obtained from one of the following authorized EEPROM service centers:

AUTHORIZED EEPROM SERVICE CENTERS

Auto. Electric Radio D and B Auto Radio 1841 W.Commonwealth 3725 N. 25th Avenue Fullerton, CA 92633 Schiller Park, IL 60176 (714) 871-7426 (312) 678-8475 1-800-321 -6969 (Outside Calif.) 1-800-3234813 (Outside III.) 1-800-321-6970 (Calif. Only) 1-800-942-8049 (III. Only)

Techi-Car H and R Radio 5688 W. Crenshaw Street 146 Horsham Road Tampa, FL 33614 Horsham, PA 19044 (813) 884-0022 (215) 674-4471 1-800-822-0022 (Outside Fla.) 1 -800-523-6605 (Outside Penn.) 1-800-662-0022 (Fla. Only) 1 -800-492-2074 (Penn. Only)

CLAIM INFORMATION

Failure Labor Labor Operation Code Operation Hours --------- ---- --------- ----

Inspect for driver 96 V3840 .2 information message. EEPROM replacement NOT necessary.

Inspect for driver 96 V3841 .6 information message and replace EEPROM

.1 hour for clerical administration may be added to Labor Operation V3840.

.2 hour for sublet and clerical administration may be added to Labor Operation V3841.

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.