Hummer H2. Manual - part 571

 

  Index      Hummer     Hummer H2 - service repair manual 2004 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  569  570  571  572   ..

 

 

Hummer H2. Manual - part 571

 

 

Did you find and correct the condition?

Go to Step 15

Go to Step 12

9

Test the signal circuit of the recline position 
sensor for one of the following conditions: 

z

A short to ground  

z

A high resistance  

z

An open  

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

-

Go to Step 15

Go to Step 12

10

Test the low reference circuit of the recline 
position sensor for one of the following 
conditions: 

z

A high resistance  

z

An open  

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

-

Go to Step 15

Go to Step 11

11

Inspect for poor connections at the harness 
connector of the recline position sensor. 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 15

Go to Step 13

12

Inspect for poor connections at the harness 
connector of the driver seat module. 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 15

Go to Step 14

13

Replace the recline position sensor. 
Did you complete the replacement?

-

Go to Step 15

-

14

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

-

Go to Step 15

-

15

1. Use the scan tool in order to clear the 

DTCs.  

2. Operate the vehicle within the 

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

DTC B1850, B1860, B1960, B2355, B2365, OR B2375 

Circuit Description 

The driver seat module monitors the positions of most of the seat adjuster motors using hall effect type position 
sensors. The hall effect position sensors are supplied with battery positive reference and ground circuits from 
the driver seat module. The position sensor signal circuits are supplied battery positive voltage through a 
resistor then monitored within the driver seat module. During adjuster motor operation the hall effect position 
sensor provides a single pulse for every adjuster motor shaft rotation. The driver seat module counts the pulses 
from the position sensor signal circuits to determine the adjuster motor positions when storing or recalling 
memory seat position settings. 

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 does not detect position sensor movement during adjuster motor operation. 

Action Taken When the DTC Sets 

z

The affected seat adjuster motor will operate approximately 1 revolution and stop each time the adjuster 
switch is activated.  

z

The memory recall functions for the seat motor with a current status DTC will be disabled.  

z

When the fault is no longer present a history status DTC will be stored, and memory 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.  

Test Description 

The numbers below refer to the step numbers on the diagnostic table. 

3: During this test the driver seat module must see an active switch input before power will be supplied 
the position sensor.  

4: During this test the driver seat module must see an active switch input before power will be supplied 

Conditions for Running the DTC.  

Does the DTC reset?

Go to Step 2

System OK

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

the position sensor.  

5: During this test the driver seat module must see an active switch input before power will be supplied 
the position sensor.  

DTC B1850, B1860, B1960, B2355, B2365, or B2375 

Step

Action

Yes

No

Schematic Reference:Driver 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 position sensor connector to 

the motor for which the DTC has set.  

2. Connect a DMM from the positive voltage 

reference circuit terminal in the position 
sensor harness connector to a good ground.  

3. Press the adjuster switch in either direction.  

Does the DMM display battery voltage when the 
adjuster switch is pressed?

Go to Step 4

Go to Step 6

4

1. Connect a DMM from the positive voltage 

reference circuit terminal to the low 
reference circuit terminal in the position 
sensor harness connector.  

2. Press the adjuster switch in either direction.  

Does the DMM display battery voltage when the 
adjuster switch is pressed?

Go to Step 5

Go to Step 7

5

1. Connect a DMM from the signal circuit 

terminal to the low reference circuit terminal 
in the position sensor harness connector.  

2. Press the adjuster switch in either direction.  

Does the DMM display battery voltage when the 
adjuster switch is pressed?

Go to Step 9

Go to Step 8

Test the position sensor positive voltage reference 
circuit for the following conditions: 

z

Open  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

6

z

Short to ground  

z

Short to voltage  

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

Go to Step 13

Go to Step 10

7

Test the position sensor low reference circuit for 
an open or short to voltage. Refer to Circuit 
Testing and to Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 13

Go to Step 10

8

Test the position sensor signal circuit for the 
following conditions: 

z

Open  

z

Short to ground  

z

Short to voltage  

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

Go to Step 13

Go to Step 10

9

Inspect for poor connections at the adjuster motor 
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 13

Go to Step 11

10

Inspect for poor connections at the harness 
connector of the driver seat module. 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 13

Go to Step 12

11

Replace the appropriate adjuster motor assembly. 
Refer to Seat Adjuster Motor Replacement - 
Front or Lumbar Replacement - Front Seat . 
Did you complete the replacement?

Go to Step 13

-

12

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

Go to Step 13

-

13

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

2. Operate the vehicle within the Conditions 

for Running the DTC.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

 

 

 

 

 

 

 

Content   ..  569  570  571  572   ..