Hummer H2. Manual — part 734
12
Inspect for poor connections at the horn relay. Refer
to Testing for Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring
Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 20
13
Repair the high resistance in the horn control circuit
or the horn ground circuit. Also, though unlikely, it is
possible that both horns are defective. Refer to
Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you complete the repair?
Go to Step 21
-
14
Repair the open or high resistance in the battery
positive voltage circuit of the horn relay coil. Refer to
Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you complete the repair?
Go to Step 21
-
15
Repair the open or short to voltage in the horn relay
control circuit. The horn relay control circuit includes
the horn switch. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 21
-
16
Repair the open or high resistance in the battery
positive voltage circuit of the horn relay switch. Refer
to Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you complete the repair?
Go to Step 21
-
17
Repair the open or high resistance in the horn control
circuit. Refer to Circuit Testing and Wiring Repairs
in Wiring Systems.
Did you complete the repair?
Go to Step 21
-
18
Repair the open or high resistance in the horn ground
circuit. Refer to Circuit Testing and Wiring Repairs
in Wiring Systems.
Did you complete the repair?
Go to Step 21
-
19
Replace the BCM. Refer to Body Control Module
Replacement in Body Control System.Did you
complete the replacement?
IMPORTANT:
Perform the BCM programming procedure when
replacing the BCM.
Go to Step 21
-
20
Replace the horn relay.
Did you complete the replacement?
Go to Step 21
-
21
Operate the horns.
Do the horns operate properly?
System OK
Go to Step 1
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Horns - Hummer H2
HORNS INOPERATIVE - ONE HORN
Test Description
The number below refers to the step number on the diagnostic table.
9: The horns need maximum current flow to operate properly. A high resistance - greater than 0.5 ohm -
in the horn control circuit or the horn ground circuit could cause operating problems with the horns.
Inspect the circuits for faults that would restrict current flow.
Horns Inoperative - One Horn
Step
Action
Yes
No
DEFINITION: This diagnostic procedure is for use with systems that have multiple horns in which one
of the horns is inoperative.
1
Did you perform the Horns Diagnostic System
Check?
Go to Step 2
Go to Diagnostic
System Check -
Horns
2
Depress the horn switch.
Do all of the horns operate?
Go to Testing for
Intermittent Conditions
and Poor Connections in
Wiring Systems
Go to Step 3
3
1. Disconnect the inoperative horn.
2. Connect a test lamp between the horn
control circuit and a good ground.
3. Depress and hold the horn switch.
Does the test lamp illuminate?
Go to Step 4
Go to Step 7
4
1. Connect a test lamp between the horn
control circuit and the horn ground circuit.
2. Depress and hold the horn switch.
Does the test lamp illuminate?
Go to Step 5
Go to Step 8
5
Inspect for poor connections at the inoperative
horn. Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 11
Go to Step 6
6
1. Connect a 15 amp fused jumper wire
between the positive battery terminal and
the control terminal of the horn.
2. Connect another jumper wire between the
negative battery terminal and the ground
terminal of the horn.
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Horns - Hummer H2
HORNS - POOR TONE
Horns - Poor Tone
Does the horn sound?
Go to Step 9
Go to Step 10
7
Repair the open or poor connection in the horn
control circuit. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 11
-
8
Repair the open or poor connection in the horn
ground circuit. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 11
-
9
Repair the high resistance in the horn control
circuit or the horn ground circuit of the horn.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you complete the repair?
Go to Step 11
-
10
Replace the inoperative horn. Refer to Horn
Replacement .
Did you complete the replacement?
Go to Step 11
-
11
Operate the horns.
Do the horns operate properly?
System OK
Go to Step 1
Step
Action
Yes
No
1
Did you perform the Horns Diagnostic System Check?
Go to
Step 2
Go to Diagnostic
System Check -
Horns
2
Depress the horn switch.
Do the horns have a harsh tone or buzzing?
Go to
Step 3
Go to Symptoms -
Horns
3
1. Test the horn mounting hardware for adequate torque. Refer
to Fastener Tightening Specifications
2. Inspect the horns for debris in the joint where the horns
attach to the vehicle.
orDid you find and correct the condition?
Go to
Step 7
Go to Step 4
4
1. Connect a 15 amp fuse jumper wire between the positive
battery terminal and the control terminal of the horn.
2. Connect another jumper wire between the negative battery
terminal and the ground terminal of the horn.
Do the horns have a harsh tone or buzzing?
Go to
Step 6
Go to Step 5
5
Repair the high resistance in the horn control circuit or the horn
ground circuit. Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Go to
-
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Horns - Hummer H2
REPAIR INSTRUCTIONS
HORN REPLACEMENT
Removal Procedure
Fig. 4: Horn
Courtesy of GENERAL MOTORS CORP.
Did you complete the repair?
Step 7
6
Replace the horns. Refer to Horn Replacement .
Did you complete the replacement?
Go to
Step 7
-
7
Operate the horns.
Do the horns operate properly?
System
OK
Go to Step 1
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Horns - Hummer H2
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