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
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