Hummer H2. Manual - part 577

POWER SEAT DOES NOT TILT REARWARD (PASSENGER) 

Power Seat Does Not Tilt Rearward (Passenger) 

Systems. 
Did you find and correct the condition?

Go to Step 16

Go to Step 13

12

Inspect for poor connections at the seat adjuster 
switch 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 16

Go to Step 14

13

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 16

Go to Step 15

14

Replace the seat adjuster switch. Refer to Seat 
Switch Replacement - Power . 
Is the repair complete?

Go to Step 16

-

15

Replace the driver seat module. Refer to Memory 
Seat Control Module Replacement . 
Is the repair complete?

Go to Step 16

-

16

Operate the system to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

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

1

Did you review the Power Seats System Description 
and Operation and perform the necessary inspections?

Go to Step 2

Go to 

Symptoms - 

Seats

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 rear vertical adjuster motor 

connector.  

2. Connect a test lamp between the rear vertical 

motor control circuit terminals in the harness 
connector.  

3. Operate the rear vertical adjuster switch in both 

directions.  

Does the test lamp illuminate when the switch is 
operated in both directions?

Go to Step 6

Go to Step 4

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

POWER SEAT DOES NOT RECLINE (DRIVER) 

Power Seat Does Not Recline (Driver) 

4

Test the rear vertical motor control circuits for an 
open or 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

5

Inspect for poor connections at the seat adjuster 
switch. 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 rear vertical 
adjuster motor. 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 adjuster switch. Refer to Seat 
Switch Replacement - Power . 
Is the repair complete?

Go to Step 9

-

8

Replace the rear vertical adjuster motor. Refer to Seat 
Adjuster Motor Replacement - Front . 
Is the repair complete?

Go to Step 9

-

9

Operate the system to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

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. Install a scan tool.  

2. Observe the Recline Forward and Rearward 

Switch parameters in the driver seat module 
Input/Output data list.  

Do either of the Recline Switch parameters display 
Active?

Go to Step 4

Go to Step 5

Disconnect the seat adjuster switch connector. 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

4

Do both of the Recline Switch parameters display 
Inactive?

Go to Step 12

Go to Step 9

5

Operate the recline forward switch. 
Does the scan tool display the recline forward 
switch as Active?

Go to Step 6

Go to Step 7

6

Operate the recline rearward switch. 
Does the scan tool display the recline rearward 
switch as Active?

Go to Step 13

Go to Step 8

7

1. Disconnect the seat adjuster switch 

connector.  

2. Connect a fused jumper wire from the 

battery voltage supply circuit terminal to the 
recline forward switch signal circuit terminal 
in the harness connector.  

Does the scan tool display the recline forward 
switch as Active?

Go to Step 12

Go to Step 10

8

1. Disconnect the seat adjuster switch 

connector.  

2. Connect a fused jumper wire from the 

battery voltage supply circuit terminal to the 
recline rearward switch signal circuit 
terminal in the harness connector.  

Does the scan tool display the recline rearward 
switch as Active?

Go to Step 12

Go to Step 11

9

Test the active recline switch signal circuit for a 
short to voltage. Refer to Circuit Testing and to 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 16

Go to Step 13

10

Test the recline forward switch signal circuit for an 
open or high resistance. Refer to Circuit Testing 
and to Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 16

Go to Step 13

11

Test the recline rearward switch signal circuit for 
an open or high resistance. Refer to Circuit 
Testing and to Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 16

Go to Step 13

12

Inspect for poor connections at the seat adjuster 
switch 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 16

Go to Step 14

Inspect for poor connections at the driver seat 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

POWER SEAT DOES NOT RECLINE (PASSENGER) 

Power Seat Does Not Recline (Passenger) 

13

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 16

Go to Step 15

14

Replace the seat adjuster switch. Refer to Seat 
Switch Replacement - Power . 
Is the repair complete?

Go to Step 16

-

15

Replace the driver seat module. Refer to Memory 
Seat Control Module Replacement . 
Is the repair complete?

Go to Step 16

-

16

Operate the system to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

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

1

Did you review the Power Seats System Description 
and Operation and perform the necessary 
inspections?

Go to Step 2

Go to 

Symptoms - 

Seats

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 recline adjuster motor 

connector.  

2. Connect a test lamp between the recline motor 

control circuit terminals in the harness 
connector.  

3. Operate the recline adjuster switch in both 

directions.  

Does the test lamp illuminate when the switch is 
operated in both directions?

Go to Step 6

Go to Step 4

4

Test the recline motor control circuits for an open or 
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

5

Inspect for poor connections at the seat adjuster 
switch. Refer to Testing for Intermittent 
Conditions and Poor Connections and to 
Connector Repairs in Wiring Systems. 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2