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To correct what was stated in the video, 12 is battery input to PCM disconnected within last 50 key on cycles and 55 is completion of fault code display.

We know this works on early 97s. At some point at or near the changeover to the 98 model year it stopped working. The feature returned somewhere between the 00 and 01 model years. Maybe your 97s are from later in the production run and have updated PCMs that went on into the 98 model year...

Having found this thread I thought I'd add this diagram. I made it when explaining how to convert lights from a private import from the USA to Europe spec.

The key trick works just fine to get OBDI codes displayed in my 97 odometer. It's even described in the 97 FSM.. USING THE VEHICLE ODOMETER (1) Cycle the ignition key On - Off - On - Off - On within 5 seconds. (2) Read the actual DTC number displayed on the vehicle odometer. Each number will...

Try the key trick to see if there are any codes. Not all will cause the CEL to illuminated. Within five seconds and without starting the engine, turn the ignition on-off-on-off-on. Leave it on the third time. Any codes will display in the odometer filled by 55 which means end of codes. You...