Service Procedure
A. Inspection1. Raise hood and install fender covers.
FIGURE 1:
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.
FIGURE 2:
B. Clear BCM Malfunction Code
To clear BCM codes, press the fan up ( ) 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.
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 obtained 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.
^ Complete Vehicle Identification Number
^ Whether or not the vehicle was built for U.S. or foreign country operation (Z49)*
^ Whether or not the vehicle is equipped with twilight sentinel option (T82)*
^ Whether or not the vehicle is equipped with voice module option (UV1)*
^ 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 offices 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
FIGURE 3:
9. Remove 4 screws from access 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
FIGURE 1:
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. The message "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.