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