Power Seats -Mechanical Diagnosis of Adjuster. Chevrolet Astro

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 Body and Accessories 🢒 Seats 🢒 Power Seats -Mechanical Diagnosis of Adjuster

Table 1:	The Seat Jerks or Moves with Difficulty when Adjusted Horizontally
Table 2:	There is a Horizontal Chuck or Looseness when the Seat is Adjusted
Table 3:	One Seat Adjuster will not Operate Horizontally
Table 4:	One Seat Adjuster will not Operate Vertically
Table 5:	Both of the Seat Adjusters will not Operate Horizontally and/or Vertically
Table 6:	There is Vertical Chuck or Looseness When the Seat is Adjusted

Problem	Action
The adjuster shoes and channels are not properly lubricated.	Lubricate the carriages and the seat adjuster slides with a lithium base grease.
The adjuster horizontal actuator gear is too tight to the rack gear.	Inspect the transmission assembly. Tighten the mounting screws or replace the assembly, if needed.

Problem	Action
The horizontal actuator is improperly adjusted to the rack gear.	Inspect the transmission assembly. Replace the assembly, if needed.

Problem	Action
The horizontal drive cable is disconnected or damaged.	Inspect the drive cable. Replace the drive cable, if needed.
The horizontal actuator is inoperative.	Inspect the adjuster motor assembly. Replace the assembly, if needed.

Problem	Action
The vertical drive cable is disconnected or damaged.	Inspect the vertical drive cables. Replace the cables, if needed.
The vertical gearnut is inoperative.	Replace the vertical actuator assembly.

Problem

Action

One of the following solenoid components is damaged or inoperative:

•	The plunger

•

The shaft

•

The dog

•	The dog spring

•

The gear

•	The drive gear

Replace the damaged or inoperative solenoid components.

Problem	Action
There is excessive clearance at the vertical gearnut tension spring.	Grind down the top of the gearnut shoulder nut 0.40-1.19 mm (1/64-3/64 in) maximum