SOURCE: ECM location 1998 Oldsmobile Silhouette
On the 98 Silhouette, the PCM should be located in the air filter housing.
SOURCE: Main Problem: code reader scanner unable to
Well, I don't know about the "cert.GM tech", but the WIRING DIAGRAMS for your vehicle say that there are 4 ground circuits for your Powertrain Control Module (PCM) They are pins 16, 56, 57, and 60 in connector 1 at the PCM. They all have the same grounding point: G110 which is located just to the left of the starter on the transmission bell housing. Your negative battery cable grounds there also. Incidently, the grounds for the fuel pump relay and the ignition control module also originate from this point. (You will find several wires bolted to the transmission here.) Actually, it will be a special bolt in the transmission bell housing bolt with a stud made onto it and a 15mm nut will be holding all the wire terminals to the bolt.
With all that said, if I had a PCM that would not communicate with a code reader, the VERY FIRST thing I would check would be the Cigarette Lighter fuse. It is located in the fuse block in the right end of the dash. It is marked "CIGAR/DLC" and is a 15 Amp fuse. If this fuse is blown, unplug whatever you have plugged into the cigarette lighter before replacing it. It is very common for ths fuse to be blown as a result of defective phone chargers and laptop computer power supplies, etc.
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