Hummer H3. Manual — part 1577

LUMBAR SWITCH REPLACEMENT

Fig. 15: Replacing Lumbar Switch
Courtesy of GENERAL MOTORS CORP.

Lumbar Switch Replacement

Tighten: 25 N.m (18 lb ft)

2

Seats Cushion Frame Nut

Tighten: 25 N.m (18 lb ft)

3

Seat Cushion Frame Assembly
Tip: Remove the wiring harness retainers.

4

Seat Adjuster Assembly
Tip: If replacing the seat adjuster mechanism, remove the seat position
sensor and retain to use on the new adjuster. Refer to Inflatable Restraint
Seat Position Sensor Replacement .

Callout

Component Name

Preliminary Procedures

1. Remove the front bucket seat. Refer to Front Seat Replacement - Bucket .

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Power Seats - H3

FRONT SEAT LUMBAR SUPPORT REPLACEMENT

Fig. 16: Replacing Front Seat Lumbar Support
Courtesy of GENERAL MOTORS CORP.

Front Seat Lumbar Support Replacement

2. Remove the front seat trim panel. Refer to Front Seat Trim Panel Replacement

(Manual Lumbar) or Front Seat Trim Panel Replacement (Power Lumbar) .

1

Seat Switch Assembly Screw (Qty: 3)

Tighten: 2 N.m (18 lb in)

NOTE:

Refer to Fastener Notice .

2

Seats Switch Bezel Assembly

3

Seat Lumbar Control Switch
Tip: Disconnect the electrical connector.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Power Seats - H3

DESCRIPTION AND OPERATION

LUMBAR SUPPORT DESCRIPTION AND OPERATION

Power Lumbar System Operation

The power lumbar system is controlled through the power lumbar switch. Battery voltage is
supplied to the power lumbar switch through the SEATSW 40A fuse in the underhood BEC and
the Power Seats 20A circuit breaker in the driver seat wiring harness. While the lumbar switch is
in an inactive state the switch contacts are closed to the lumbar switch ground circuit. When a
lumbar switch is pressed to an active state the switch contact is closed to the battery voltage
supply circuit. The lumbar adjuster motor is controlled by the lumbar switch through 2 motor
control circuits. The lumbar adjuster motor is bidirectional and the direction of adjuster motor
rotation is determined by which of the motor control circuits is switched to battery voltage while
the other remains grounded.

POWER SEATS SYSTEM DESCRIPTION AND OPERATION

Power Seat System Operation

The power seats are controlled through the power seat switch. Battery voltage is supplied to the

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .

Preliminary Procedure

1. Remove the front bucket seat. Refer to Front Seat Replacement - Bucket .

2. Remove the seat back panel. Refer to Front Seat Back Panel Replacement .

3. Remove the seat back cover and pad. Refer to Front Seat Back Cushion Cover and

Cushion Pad Replacement .

1

Rivet, Seat Lumbar Support
Tip: Drill out the rivet to remove the lumbar actuator and install new rivets
to replace.

2

Support Assembly, Seat Lumbar
Tip:

1. Disconnect the electrical connector.

2. Detach the seat back frame wire from the top of the lumbar.

3. Detach the seat back frame wire from the bottom of the lumbar.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Power Seats - H3

power seat switch through the SEATSW 40A fuse in the underhood BEC and the Power Seats
20A circuit breaker in the driver seat wiring harness. While the seat adjuster switches are in an
inactive state the switch contacts are closed to the power seat switch ground circuit. When a
power seat switch is pressed to an active state the switch contact is closed to the battery voltage
supply circuit. Each seat adjuster motor is controlled by the power seat switch through 2 motor
control circuits. The seat adjuster motors are bidirectional and the direction of adjuster motor
rotation is determined by which of the adjuster motor control circuits is switched to battery
voltage while the other remains grounded.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Power Seats - H3