Checked 91 EVTM (likely similar)
"Fasten Belts" indicator lamp has one side going to ground. The other side is wired to the warning chime.
Therefore, a non-present or completely defective warning chime will cause no belt indicator functionality.
The warning chime is a small plastic box (about the size of a computer mouse) with a connector shaped similar to the EEC-IV test connector. It is, in all box Panthers, to the left of the radio and down a bit.
The warning chime receives "hot in start" power via fuse #18 (10 amp) and "always hot" power via fuse 8 (10 amp) in a 1991.
The switch inside the buckle is a separate input to the warning chime unit and does not directly connect to the bulb.
I will verify against my '83 EVTM later, but I expect the circuit is largely the same...
Note that an '89 may be more similar to an '83 so take this as what you will I guess.
Edit: same in '83 except it appears not to have an "always hot" feed, so that's why there is no headlight chime, only seatbelt and door open with key in ('91 also has a headlamps on/door open trigger for the chime).
Edit again: hey look, I have chimes in my parts box! White or possibly blue are earlier years, black and a little bit smaller are newer years. Newer ones "bing" slightly faster than older ones. Plug-n-play compatible as far as I can tell, I have one from an '87 in my '83.
"Fasten Belts" indicator lamp has one side going to ground. The other side is wired to the warning chime.
Therefore, a non-present or completely defective warning chime will cause no belt indicator functionality.
The warning chime is a small plastic box (about the size of a computer mouse) with a connector shaped similar to the EEC-IV test connector. It is, in all box Panthers, to the left of the radio and down a bit.
The warning chime receives "hot in start" power via fuse #18 (10 amp) and "always hot" power via fuse 8 (10 amp) in a 1991.
The switch inside the buckle is a separate input to the warning chime unit and does not directly connect to the bulb.
I will verify against my '83 EVTM later, but I expect the circuit is largely the same...
Note that an '89 may be more similar to an '83 so take this as what you will I guess.
Edit: same in '83 except it appears not to have an "always hot" feed, so that's why there is no headlight chime, only seatbelt and door open with key in ('91 also has a headlamps on/door open trigger for the chime).
Edit again: hey look, I have chimes in my parts box! White or possibly blue are earlier years, black and a little bit smaller are newer years. Newer ones "bing" slightly faster than older ones. Plug-n-play compatible as far as I can tell, I have one from an '87 in my '83.
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