Seat Back - Bind in the Inertia Locking Mechanism

90chevy24
GMC NUMBER: 90-10-96

GROUP: 10 Body Section

DATE: September, 1990

CORPORATE
NUMBER: 061011R
SUBJECT: INERTIA LOCK ON BENCH AND BUCKET SEATS/SEATS WILL NOT TILT FORWARD

MODELS: 1988-90 C/K TRUCKS EXCEPT 1988-90 EXTENDED CAB MODELS WITH A50/AE7 SEATS AND 1990 REGULAR CAB MODELS WITH A52 SEATS
Some owners of 1988-90 C/K trucks (except 1988-90 extended cab models with A50/AE7 seats and 1990 regular cab models with A52 seats) may be expressing concern that their seat will not tilt forward without using the latch release mechanism. This condition has been determined to be a result of a bind in the seat back inertia locking mechanism. This bind is a result of a foam buildup causing the pendulum mechanism to lock. Use of the latch release mechanism will overcome any interference caused by the foam. Hence the seat back can still be tilted forward.

SERVICE PROCEDURE

The following steps should be followed to correct the inertia lock bind.

1. Remove seat back to expose the hinge assembly.

2. If equipped remove the inertia lock cover assembly (added in 1989).

3. Locate inertia lock pendulum. You will notice foam trapped below, behind and on top of the pendulum.
4. Clear away any trapped foam and confirm that the inertia mechanism swings freely.

5. Pull back cloth or vinyl covering and cut away about 3/4 of an inch of foam from near the hinge assembly.

6. Reinstall inertia lock cover (if equipped) to hinge assembly.

7. Clear away any excess foam that may be laying loose to ensure that no foam remains to get caught in the pendulum.

8. Place cloth cover back over the foam.

9. Reattach seat back.

WARRANTY INFORMATION

For vehicle repaired under warranty use-.

Labor Operation: T7021

Labor Time: .4 hr

NOTE: Labor Operation is coded to base vehicle coverage in the warranty system.