Hummer H3. Manual — part 1612

DESCRIPTION AND OPERATION

HEATED SEATS DESCRIPTION AND OPERATION

Heated Seats System Operation

The driver and front passenger seats are heated using electric heater elements located in the seat
cushions and seat backs. The heated seat control module is part of the seat cushion element and
harness assembly and controls the battery positive voltage used to supply the seat heater elements.
The heated seat switch and a thermistor located in the seat cushion are connected in series and
provide a single input to the heated seat control module. Ignition voltage is supplied to the heated
seat switch from the HVAC 20A fuse in the underhood BEC. When the heated seat switch is in
the high or low positions voltage is supplied through one of the internal resistors to the switch
signal circuit. The heated seat switch signal circuit is grounded through the seat cushion
thermistor which is a temperature sensitive variable resistor. The heated seat switch signal circuit
input to the heated seat control module is spliced from the circuit between the switch and the

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

2. Remove the seat back recliner handle. Refer to Driver Seat Recliner Handle and

Passenger Seat Recliner Handle Replacement .

3. Remove the front seat trim panels. Refer to Front Seat Trim Panel Replacement

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

1

Seat Cushion Cover

Procedure

1. Disconnect the seat cover J-channel from the seat cushion frame.

2. Remove the hog rings that secure the pad to the cushion cover.

2

Seat Cushion Heater
Tip:

On the driver seat peel the heater from the seat cushion and disconnect
the electrical connector.

On the passenger seat the heater must be replaced as a kit with the
passenger presence system.

3

Seat Cushion Pad
Tip: Re-zero the inflatable restraint passenger presence system whenever the
seat cushion or any component of the passenger presence system is removed.
Refer to Control Module References .

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - H3

thermistor, where the voltage level is determined by the resistance of both components. Once the
seat cushion has reached the desired temperature the heated seat control module will maintain the
heated seat switch signal circuit voltage level of 6 to 7.5 volts by switching the heater element
supply circuit on or off as necessary. The passenger heated seat switch must be enabled through
the seat belt switch in order for heated seat operation to occur.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - H3

2007 STEERING

Steering Wheel and Column - H3

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

COMPONENT LOCATOR

STEERING COLUMN DISASSEMBLED VIEW

Application

Specification

Metric

English

Lower Intermediate Steering Shaft Bolt

45 N.m

33 lb ft

Lower Steering Column Trim Cover Bolt

3.5 N.m

31 lb in

Multifunction Turn Signal Switch Housing Bolt

2.5 N.m

22 lb in

Steering Column Bolt

25 N.m

18 lb ft

Steering Column Nut

30 N.m

22 lb ft

Steering Wheel Nut

35 N.m

26 lb ft

Tilt Lever Bolt

1 N.m

9 lb in

Turn Signal Multifunction Switch Bolt

4.5 N.m

40 lb in

Upper Intermediate Steering Shaft Bolt (at the
lower intermediate steering shaft)

23 N.m

17 lb ft

Upper Intermediate Steering Shaft Bolt (at the
steering gear)

62 N.m

46 lb ft

2007 Hummer H3

2007 STEERING Steering Wheel and Column - H3

2007 Hummer H3

2007 STEERING Steering Wheel and Column - H3

Fig. 1: Steering Column Component View - Floor Shift Tilt
Courtesy of GENERAL MOTORS CORP.

Callouts For Fig. 1

Callout

Component Name

1

Upper Trim Cover

2

Lower Trim Cover

3

Shoulder Tapping Screws

4

Pan Head Tapping Screws

5

Multifunction Switch Assembly

2007 Hummer H3

2007 STEERING Steering Wheel and Column - H3