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His ZL1 · 07-20-2025, 08:03 PM

The 3LT does have the "up-level" headlights. I have yet to find details on any service tasks except R&R. So it makes sense they are non-serviceable.

I would expect to get a DTC pointing to what the problem is but my 20 year old OBDII reader shows nothing. I am in the process of reading full vehicle DTCs to see if that shows anything?

There are diagnostic procedures listed in the repair manual that are over 20 steps long. My hopes of a simple turn signal bulb replacement have been dashed.

07-20-2025, 08:03 PM	#4
His ZL1 Drives: 92 B4C, 21 1LE, 24 2SS Join Date: Jul 2013 Location: Indiana Posts: 97	Turn signal Diagnostic The 3LT does have the "up-level" headlights. I have yet to find details on any service tasks except R&R. So it makes sense they are non-serviceable. I would expect to get a DTC pointing to what the problem is but my 20 year old OBDII reader shows nothing. I am in the process of reading full vehicle DTCs to see if that shows anything? There are diagnostic procedures listed in the repair manual that are over 20 steps long. My hopes of a simple turn signal bulb replacement have been dashed.