Hummer H2. Manual - part 573

 

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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

  

 

 

 

 

 

 

 

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