Buick REGAL 1997 Manual page 58

7. Push the latch plate into the buckle until it clicks.
Pull on both latch plates to make sure they are
secure. A green indicator will show in each latch
plate window (G).
If the harness locks before the latch plate reaches the
buckle, let the harness go all the way back so it will
move freely again. Then repeat Steps 6 and 7. Be
sure to keep the harness pulled all the way out until
you buckle it.
Once both sides of the lap-shoulder harness are
pulled out of the retractor and buckled, the harness
will lock.
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