Service Procedure

1. Note the stations to which customer has their radio preset. With the ignition in the "OFF" position, open hood and disconnect negative battery cable.

2. Remove Instrument Panel right sound insulator. On Cutlass Ciera and Cutlass Cruiser, also remove the Instrument Panel Compartment.

3. Loosen nut(s) for Electronic Control Module (ECM) to mounting bracket.
4. Disconnect electrical connectors and remove ECM. See Section 8C of the 1985 Oldsmobile Firenza, Calais, Cutlass Ciera, Ninety-Eight Chassis Service Manual, Volume 11, for illustration and removal Instructions.

5. Remove PROM access cover. See Section 6E3, pages 174, 175, and 176, of above noted service manual for detailed instructions regarding PROM removal and installation.

Figure 1.:

6. Remove PROM assembly using the rocker-type PROM removal tool (See Figure 1).

NOTICE: Using the rocker-type PROM removal tool, engage one end of the PROM carrier with the hook end of the tool. Press on the vertical bar end of the tool and rock the engaged end of the PROM carrier up as far as possible. Engage the opposite end of the PROM carrier in the same manner and rock this end up as far as possible. Repeat this process until the PROM carrier and PROM are free of the PROM socket. The PROM carrier with PROM in it should lift off of the PROM socket easily. PROM carrier should only be removed by using the pictured PROM removal tool. Other methods could cause damage to the PROM or PROM socket.

7. Install new PROM assembly in ECM. On the NINETY-EIGHT, install new PROM based on the old PROM Code or old PROM I.D. per the PARTS INFORMATION section.

NOTICE: Small notch of PROM carrier should be aligned with small notch in ECM socket. Press on PROM carrier until it is firmly seated in the socket. Do not press on PROM, only on the carrier. See Figure 2.

Figure 2.:

8. Reverse stops 5 to 2 to reinstall ECM.

9. Reconnect the negative battery cable, and reset memory functions, including owner's radio station preferences.

10. Start the engine and observe check engine light. If it does not go out, the PROM was installed backwards and is now damaged; a new PROM will have to be installed in the correct orientation.

11. Install a Campaign Identification Label.


CAMPAIGN IDENTIFICATION LABEL

Each label provides space to print the campaign number, and the five (5) digit dealer code of the dealer performing the campaign. Insert this information with a typewriter or ballpoint pen. When installing label, clean and dry the surface of the radiator support tie bar and apply the campaign label where it is readily visible.