Hummer H2. Manual — part 573

5. With a scan tool, observe the Heated

Seat Sensor parameter.

Is the Heated Seat Sensor parameter greater
than the specified value?

Go to Step 4

Go to Step 5

4

1. Turn OFF the ignition.

2. Connect a 3-ampere fused jumper wire

between the signal circuit of the heated
seat sensor and the low reference
circuit of the heated seat sensor.

3. Start the engine.

4. Turn the heated seat ON.

5. With a scan tool, observe the Heated

Seat Sensor parameter.

Is the Heated Seat Sensor parameter less than
the specified value?

0.5 V

Go to Step 8

Go to Step 6

5

Test the signal circuit of the heated seat
sensor for a short to ground. Refer to Circuit
Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

-

Go to Step 12

Go to Step 9

6

Test the signal circuit of the heated seat
sensor for one of the following conditions:

z

A short to voltage

z

A high resistance

z

An open

Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 12

Go to Step 7

7

Test the low reference circuit of the heated
seat sensor for one of the following
conditions:

z

A high resistance

z

An open

Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 12

Go to Step 9

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

DTC B3941

Circuit Description

The driver and passenger seat heaters are controlled by the driver seat module. Power is supplied to the driver
seat cushion and back heater elements through individual voltage supply circuits. Power is supplied to the
passenger seat cushion and back heater elements through a common voltage supply circuit. All of the driver and
passenger seat heater elements are grounded by the driver seat module through individual low side drive control
circuits. The heater element control circuits are pulse width modulated to ground by the driver seat module in
order to control the seat temperatures by regulating the current flow through the heater elements.

Conditions for Running the DTC

The system voltage must be between 9.0-16.0 volts.

Conditions for Setting the DTC

The driver seat module determines that one of the seat heater element voltage supply circuits is shorted to
ground.

8

Inspect for poor connections at the harness
connector of the heated seat sensor. Refer to
Testing for Intermittent Conditions and
Poor Connections and Connector Repairs
in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the harness
connectors of the driver seat module. Refer to
Testing for Intermittent Conditions and
Poor Connections and Connector Repairs
in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 12

Go to Step 11

10

Replace the seat back heater element. Refer
to Diagnostic System Check - Power Seat
Systems .
Did you complete the replacement?

-

Go to Step 12

-

11

Replace the driver seat module. Refer to
Memory Seat Control Module
Replacement .
Did you complete the replacement?

-

Go to Step 12

-

12

1. Use the scan tool in order to clear the

DTCs.

2. Operate the vehicle within the

Conditions for Running the DTC.

Does the DTC reset?

-

Go to Step 2

System OK

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

Action Taken When the DTC Sets

z

Both heated seats will be disabled.

z

When the fault is no longer present a history status DTC will be stored, and heated seat operation will be
restored.

Conditions for Clearing the DTC

z

The DTC will be current for as long as the fault is present.

z

When the fault is no longer present the DTC will be a history status code.

z

The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing
DTCs feature.

DTC B3941

Step

Action

Yes

No

Schematic Reference:Driver Seat Schematics , Passenger Seat Schematics
Connector End View Reference:Power Seat Systems Connector End Views

1

Did you perform the Power Seat Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Power Seat

Systems

2

Verify the fault is present.
Does the system operate normally?

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

Go to Step 3

3

1. Disconnect the driver seat module

connectors containing the voltage supply
and control circuits to the seat heater
elements.

2. Using a DMM test for continuity to ground

at the heater element supply circuit
terminals in the harness connectors. Refer to
Circuit Testing in Wiring Systems.

Is continuity to ground present on any of the
heater element supply circuits?

Go to Step 4

Go to Step 6

4

1. Disconnect the affected seat heater element

connector.

2. Test the heater element voltage supply

circuit for a short to ground. Refer to
Circuit Testing and to Wiring Repairs in
Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 5

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

DTC B3962

Circuit Description

The seat adjuster motors are controlled by the driver seat module through the adjuster motor control circuits. In
an inactive state both of the motor control circuits are grounded within the driver seat module. In an active state
the driver seat module switches the appropriate motor control circuit to battery positive voltage. The direction
of the adjuster motor rotation is determined by which of the motor control circuits is switched to battery
positive voltage while the other remains grounded. During adjuster motor operation the driver seat module also
monitors the current flow through the motor control circuits.

Conditions for Running the DTC

The system voltage must be between 9.0-16.0 volts.

Conditions for Setting the DTC

A motor control circuit current monitored by the driver seat module is determined to be shorted to ground.

Action Taken When the DTC Sets

5

Inspect for poor connections at the seat heater
element harness connector. Refer to Testing for
Intermittent Conditions and Poor Connections
and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the driver seat
module harness connectors. Refer to Testing for
Intermittent Conditions and Poor Connections
and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the seat heater element. Refer to Seat
Back Heater Element Replacement - Front or
Seat Cushion Heater Element Replacement -
Front .
Did you complete the replacement?

Go to Step 9

-

8

Replace the Seat Module. Refer to Memory Seat
Control Module Replacement .
Did you complete the replacement?

Go to Step 9

-

9

1. Use the scan tool in order to clear the DTCs.

2. Operate the vehicle within the Conditions

for Running the DTC as specified in the
supporting text.

Does the DTC reset?

Go to Step 2

System OK

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2