Hi,
Did this happen after the transmission was checked? There is a backup light switch on the transmission which could have failed. Do this. First, check fuses 59 and 63 in the under-hood fuse box. If the fuses are good, confirm they have power. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If everything checks good, I need you to go to the transmission and locate the switch. There are two different manual transmissions used. I attached a pic of both showing where the switch is located. Make sure the connector is tight, clean, and not damaged.
If everything is in good condition, disconnect the connector. Using a test light, probe the connectors, one at a time. One should have battery voltage.
The last pic shows the fuses to check.
Let me know what you find or if you have questions.
Take care,
Joe
See pics below.
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Monday, May 30th, 2022 AT 9:17 PM