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Hello just a guess here but by any chance is the lighter still working check for a blown fuse i have had this problem in the past and have traced it back to a fuse to the lighter or something crazy like that and as soon as i fixed this then i got communication back to the PCM. They run the power for the OBD connector off of other thing in the car
Check your fuses and replace any that are blown. Usually the cigarette lighter fuse also powers the DLC (data link connector) with this fuse blown the scan tools can not communicate with the OBD2 system.
Data Link Connector (DLC)
The data link connector (DLC) contains the following serial data links:
• Class II
• Entertainment and Comfort (E&C)
The DLC also provides a power source for the scan tool as follows:
• Unswitched voltage (B+) at DLC terminal 16 (circuit 1450)
• Ground at terminal 4 (circuit 1450) and terminal 5 (circuit 1550)
Class II Serial Data Link
The class II serial data link allows the following modules to communicate data with each other:
• Body control module (BCM)
• Electronic brake traction control module (EBTCM)
• Heater-A/C control (if equipped with RPO CJ2)
• Instrument panel cluster (IPC)
• Powertrain control module (PCM)
• Inflatable Restraint Sensing and Diagnostic Module (SDM).
The Class II serial data link allows a Scan Tool scan tool to communicate with the above modules for diagnostic and testing purposes. The Class II serial data link is located at the DLC connector terminal 2. Terminal 2 consists of the following circuits:
• Circuit 1036
• Circuit 1037
• Circuit 1128
• Circuit 1049
• Circuit 1122
• Circuit 1132
Entertainment and Comfort (E&C) Serial Data Link
The entertainment and comfort (E&C) serial data link allows a scan tool to communicate with the radio or the mobile telephone handset the remote CD player (if equipped). This communication is for diagnostic and testing purposes. The E&C serial data link is located at the DLC connector terminal 14, circuit 835.
PIN #9 goes to the air bag module .
Well first check for power to obd2 connector, the next thing i've seen alot off is a worn connector some of these testing places have worn hook up connectors tell them to try to hold plug in place with a little force but also make sure all the fuses are good , If your scan tool works then theres should also,
in 1993, the computer systems were obd 1. which generally needed battery power to run scanner. 1996 up is obd2 and powers up scanner through data connector. not sure what kind of scanner you have. is it powering up ok and not communicating or cant get scanner to turn on?