Quote:
Originally Posted by Amge55
After going through each bulb, finding them all good. The warning light disappeared. Arrrrgh! It was after I checked the left rear set of light clusters it went away. Maybe it's like what Manny said - just a matter of seating it in the socket.
Nevertheless, it's off now. Still annoys me that I haven't found the cause.
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You have found the cause...
...the metal rails inside the rear lamp housings that hold the bulbs in place vibrate loose over time. When that happens, there is a loss of "ground", barely visible as a slightly dim bulb here and there, but perceptible by the lamp indicator system as increased resistance.
When you went about inspecting the bulbs, you had reseated the rails by simply reinserting the bulbs firmly in their sockets. That restored a good ground connection, and all was well according to the system.
This one took months for me to solve...