Hummer H2. Manual - part 2207

Range 10.0 - 16.0 V. Voltage measured by the suspension control module.

Compressor Relay  

Indicates when the compressor relay is activated. 

Compressor Temperature  

Identifies when the compressor thermal trip has set. 

Door Switch  

Indicates if any doors or the hatch is open. 

Engine Running  

Indicates if the engine is running. 

ERH Lamp Command  

Indicates when the ERH lamp is commanded on. 

ERH Switch  

Indicates when the ERH switch is pressed. 

Height Sensor Current  

Indicates the current of the 5 volt reference circuit for both height sensors and the pressure sensor. 

Height Sensor Supply Status  

Indicates if the 5 volt reference circuit for both height sensors and the pressure sensor is active. 

Ignition  

Indicates when the ignition is on or off. 

Ignition 3  

Indicates switched voltage at the suspension module. 

Inflator Switch  

Indicates when the inflator switch is pressed.

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

Inflator Switch Lamp Command  

Indicates when the inflator switch lamp is commanded on. 

Left Height Sensor  

Range 0.5 - 4.85 V. Indicates the vehicle height measured in volts. 

Left Isolation Valve  

Indicates when the inlet valve is active. 

Neutral Switch  

Indicates when the shifter is in neutral. 

Number of DTCs  

Indicates the number of DTCs set in the suspension module. 

Park Switch  

Indicates when the shifter is in park. 

Ride Height Status  

Indicates if the vehicle is in extended or normal ride height. 

Right Height Sensor  

Range 0.5 - 4.85 V. Indicates the vehicle height measured in volts. 

Right Isolation Valve  

Indicates when the inlet valve is active. 

Total Valve Current  

Indicates the total current that the inlet valves, exhaust valve, and compressor relay are using. 

Tow/Haul Mode  

Indicates when the transmission is in the tow/haul mode. 

Trim Height Learned  

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

Indicates if the trim height was learned after the calibration procedure.

Vehicle Speed  

Indicates the speed of the vehicle. 

DIAGNOSTIC TROUBLE CODE (DTC) LIST 

Diagnostic Trouble Code (DTC) List 

DTC B2795 

Circuit Description 

The air suspension module monitors the ride height switch signal circuit for a short to ground or battery with 
ignition on and up to 3 minutes with the ignition OFF. 

Conditions for Running the DTC 

Ignition ON or OFF. 

Conditions for Setting the DTC 

The air suspension module senses the ride height switch signal circuit voltage is shorted to ground or battery. 

Action Taken When the DTC Sets 

z

A DTC is set.  

DTC

Diagnostic Procedure

Modules

B2795

DTC B2795

ASM

C0550

DTC C0550

ASM

C0563

DTC C0563

ASM

C0569

DTC C0569

ASM

C0626

DTC C0626

ASM

C0631

DTC C0631

ASM

C0660

DTC C0660

ASM

C0696

DTC C0696

ASM

C0702

DTC C0702

ASM

C0707

DTC C0707

ASM

C0711

DTC C0711

ASM

C0712

DTC C0712

ASM

C0713

DTC C0713

ASM

C0716

DTC C0716

ASM

C0717

DTC C0717

ASM

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

z

No message is displayed.  

Conditions for Clearing the DTC 

The DTC will clear when the condition for setting the DTC is removed. 

Diagnostic Aids 

This DTC is set when the ride height switch circuitry is shorted to ground, voltage and open. 

Test Description 

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

2: This step tests for normal scan tool data parameters.  

3: This step tests for data parameter change with scan tool.  

4: This step tests the signal circuit to be inactive.  

DTC B2795 

Step

Action

Yes

No

Schematic Reference:Suspension Controls Schematics

1

Did you perform the Air Suspension Diagnostic System 
Check?

Go to Step 2

Go to Diagnostic 

System Check - Air 

Suspension

2

1. Install a scan tool.  

2. Turn ON the ignition, with the engine OFF.  

3. With a scan tool, observe the ERH Switch parameter in 

the data list for the air suspension module.  

Does the scan tool display released?

Go to Step 3

Go to Step 4

3

1. Activate the ERH switch.  

2. With the scan tool, observe the ERH Switch parameter.  

Does the ERH Switch parameter change state?

Go to 

Diagnostic 

Aids

Go to Step 4

4

1. Turn OFF the ignition.  

2. Disconnect the ERH switch.  

3. Turn ON the ignition, with the engine OFF.  

4. With a scan tool, observe the ERH Switch parameter.  

Does the scan tool display released?

Go to Step 7

Go to Step 5

5

Test the signal circuit of the ERH switch for a short to battery, 
ground or an open circuit. Refer to Circuit Testing and to 
Wiring Repairs in Wiring Systems. 

Go to Step 

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2