Hummer H2. Manual - part 2206

Electronically Controlled Air Suspension Compressor Terminal Identification Relay (ZM6) 

Air Suspension Ride Height Terminal Identification Switch (ZM6) 

3

GY

2165

5-Volt Reference

4-6

-

-

Not Used

Connector Part Information

z

15336745  

z

4-Way F GR 280 Series Metri-Pack 800 Sealed (GY)  

Pin

Wire Color

Circuit No.

Function

30

D-GN

322

Air Suspension Compressor Motor Control

85

GY

2672

Air Suspension Relay Control

86

YE

321

Air Suspension Relay Ground

87

RD

4042

Air Suspension Relay Supply Voltage

z

12177194  

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - AIR SUSPENSION 

Begin the system diagnosis with the Diagnostic System Check - Air Suspension . The Diagnostic System 
Check will provide the following information: 

z

The identification of the control module(s) which command the system.  

z

The identification of any stored diagnostic trouble codes (DTCs) and their status.  

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and 
where the procedure is located. 

DIAGNOSTIC SYSTEM CHECK - AIR SUSPENSION 

Test Description 

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

2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a 
total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular 
condition.  

3: Check for the presence of DTCs.  

4: The presence of DTCs which begin with "U" indicate some other module is not communicating. The 
specified procedure will compile all the available information before tests are performed.  

5: Check for the presence of DTCs in Body Control system.  

6: Check for the presence of DTCs in Air Suspension system.  

Diagnostic System Check - Air Suspension 

Connector Part Information

z

6-Way F Metri-Pack 150 Series (WH)  

Pin

Wire Color

Circuit No.

Function

A

L-BU

5521

Ride Height Switch Signal

B

BK

1050

Ground

C

WH

5520

Ride Height Active Indicator Control

D

PU/WH

1382

LED Dimming Signal

E

BN/WH

230

Instrument Panel Lamps Dimming Control

F

BN

241

Ignition 3 Voltage

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Install a scan tool. 
Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not 

Power Up in Data Link 

Communications

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

SCAN TOOL OUTPUT CONTROLS 

Scan Tool Output Controls 

2

1. Turn ON the ignition, with 

the engine OFF.  

2. Attempt to establish 

communication with the 
suspension control 
module.  

Does the scan tool communicate 
with the suspension control 
module?

Go to Step 3

Go to Scan Tool Does Not 

Communicate with Class 2 

Device in Data Link 

Communications

3

Select the suspension control 
module display DTCs function 
on the scan tool. 
Does the scan tool display any 
DTCs?

Go to Step 4

Go to Symptoms - Air 

Suspension

4

Does the scan tool display any 
DTCs which begin with a "U"?

Go to Scan Tool Does Not 

Communicate with Class 2 

Device in Data Link 

Communications

Go to Step 5

5

Does the scan tool display DTC 
B1000?

Go to Diagnostic Trouble 

Code (DTC) List in Body 

Control System

Go to Step 6

6

Does the scan tool display other 
DTC's?

Go to Diagnostic Trouble 

Code (DTC) List

Go to Symptoms - Air 

Suspension

Scan Tool Output 

Control

Additional Menu 

Selections

Description

Calibrate Trim Height

-

Commands the module to calibrate trim height.

Compressor Test

-

Commands the air compressor and both air suspension 
inlet valves ON and OFF.

Depressurize System

-

Commands the suspension module to deflate the air 
springs.

Exhaust Solenoid

-

Commands the exhaust solenoid ON and OFF.

Extended Ride Height 
Lamp

-

Commands the ERH switch lamp ON and OFF.

Extended Ride Height 
Switch

-

Commands the module to activate extended ride height.

Inflator Switch

-

Commands the module to activate the accessory 
inflator.

Inflator Switch Lamp

-

Commands the inflator switch lamp ON and OFF.

Left Air Solenoid

-

Commands the left air solenoid ON and OFF.

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

SCAN TOOL DATA LIST 

Scan Tool Data List 

SCAN TOOL DATA DEFINITIONS 

ALC Exhaust Solenoid  

Indicates weather the exhaust solenoid is on or off. 

Battery Voltage Signal  

Right Air Solenoid

-

Commands the right air solenoid ON and OFF.

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Vehicle in park with Ignition switch ON

ALC Exhaust Solenoid

Data Display

Active/Inactive

Inactive

Battery Voltage Signal

Data Display

Volts

9 - 16

Compressor Relay

Data Display

ON/OFF

OFF

Compressor Temperature

Data Display

OK/Hot

OK

Door Switch

Data Display

Open/Closed

Closed

Engine Running

Data Display

Yes/No

No

ERH Lamp Command

Data Display

On/Off

Off

ERH Switch

Data Display

Pressed/Released

Released

Height Sensor Current

Data Display

ma

19ma

Height Sensor Supply Status

Data Display

On/Off

On

Ignition

Data Display

On/Off

On

Ignition 3

Data Display

Volts

12-14.7

Inflator Switch

Data Display

Pressed/Released

Released

Inflator Switch Lamp Command

Data Display

ON/Off

OFF

Left Height Sensor

Data Display

Volts

2.50-3.50

Left Isolation Valve

Data Display

Active/Inactive

Inactive

Neutral Switch

Data Display

On/Off

Off

Number of DTCs

Data Display

Number

0

Park Switch

Data Display

On/Off

On

Ride Height Status

Data Display

Normal/Extended

Normal

Right Height Sensor

Data Display

Volts

2.50-3.50

Right Isolation Valve

Data Display

Active/Inactive

Inactive

Total Valve Current

Data Display

ma

0

Tow/Haul Mode

Data Display

Active/Inactive

Inactive

Trim Height Learned

Data Display

Yes/No

Yes

Vehicle Speed

Data Display

mph/km/h

0

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2