Hummer H2. Manual - part 316

The body control module (BCM) monitors the park lamp switch on signal circuit and the headlamp switch 
headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. 
When the headlamp switch is turned to PARK, the BCM senses that the park lamp switch signal on circuit is 
grounded and the headlamps switch headlamps ON signal circuit is open. The BCM will then energize the park 
lamp relay illuminating the park lamps. When the headlamp switch is turned to HEAD, the BCM senses that the 
park lamp switch on signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The 
BCM will then energize the park lamp relay and headlamp low beam relay or high beam relay illuminating the 
park lamps and headlamps. 

Conditions for Running the DTC 

The battery voltage must be between 9.0-16.0 volts. 

Conditions for Setting the DTC 

z

The headlamp switch park lamps ON signal circuit is open or has a high resistance.  

z

The headlamp switch headlamps ON signal circuit is shorted to ground.  

Action Taken When the DTC Sets 

The park lamps will not operate or the headlamps will illuminate without the park lamps. 

Conditions for Clearing the MIL/DTC 

z

This DTC will clear on current status after the condition for setting the fault is corrected.  

z

A history DTC will clear after 100 consecutive ignition cycles without a fault present.  

z

History and current DTCs can be cleared using a scan tool.  

DTC B3802 

Step

Action

Yes

No

Schematic Reference:Exterior Lights Schematics 
Connector End View Reference:Lighting Systems Connector End Views or Body Control System 
Connector End Views in Body Control System

1

Did you perform the Lighting Systems Diagnostic 
System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Lighting Systems

2

1. Install a scan tool.  

2. Turn the headlamp switch to park lamps 

ON.  

3. With a scan tool, observe the Park Lamp 

Switch and the Headlamp Switch 
parameters in the body control module 
(BCM) data list.  

Does the scan tool display park lamps ACTIVE 

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

 

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and the headlamps INACTIVE?

Wiring Systems

Go to Step 3

3

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

Go to Step 10

Go to Step 4

4

Test the headlamp switch headlamps ON signal 
circuit for a short to ground. Refer to Circuit 
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct a condition?

Go to Step 10

Go to Step 5

5

1. Disconnect the headlamp switch.  

2. Turn the headlamp switch to the ON 

position.  

3. Test for continuity between the ground 

terminal and the park lamp switch signal 
terminal of the headlamp switch. Refer to 
Circuit Testing in Wiring Systems.  

4. Test for continuity between the ground 

terminal and the headlamp switch 
headlamps on signal terminal of the 
headlamp switch. Refer to Circuit Testing 
in Wiring Systems.  

Is continuity present?

Go to Step 6

Go to Step 7

6

Inspect for poor connections at the harness 
connector of the BCM. Refer to Circuit Testing 
and Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness 
connector of the headlamp switch. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the BCM. Refer to Body Control 
Module Replacement in Body Control 
System.Did you complete the replacement?

IMPORTANT:

Perform the setup procedure for the BCM.

Go to Step 10

-

9

Replace the headlamp switch. Refer to 
Headlamp Switch Replacement . 
Did you complete the replacement?

Go to Step 10

-

1. Use the scan tool in order to clear the 

DTCs.  

2. Operate the vehicle within the Conditions 

 

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SYMPTOMS - LIGHTING SYSTEMS 

1. Perform the Diagnostic System Check - Lighting Systems before using the Symptom Tables in order to 

verify that all of the following are true: 

z

There are no DTCs set.  

z

The control modules can communicate via the serial data link.  

2. Review the system operation in order to familiarize yourself with the system functions. Refer to the 

following: 

z

Exterior Lighting Systems Description and Operation  

z

Interior Lighting Systems Description and Operation  

Visual/Physical Inspection 

z

Inspect for aftermarket devices which could affect the operation of the Lighting System. Refer to 
Checking Aftermarket Accessories in Wiring Systems.  

z

Inspect the easily accessible or visible system components for obvious damage or conditions which could 
cause the symptom.  

Intermittent 

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for 
Intermittent Conditions and Poor Connections in Wiring Systems. 

Symptom List 

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: 

z

Backup Lamps Always On  

z

Backup Lamps Inoperative  

z

Clearance Lamps Inoperative  

z

Courtesy Lamps Always On  

z

Courtesy Lamps Inoperative  

z

Daytime Running Lamps (DRL) Always On  

z

Daytime Running Lamps (DRL) Inoperative  

z

Hazard Lamps Always On  

z

Hazard Lamps Inoperative  

z

Headlamps Always On - Low or High Beam

10

for Running the DTC as specified in the 
supporting text.  

Does the DTC reset?

Go to Step 2

System OK

 

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z

Headlamps Inoperative - High Beams  

z

Headlamps Inoperative - Low Beams  

z

Headlamps Inoperative - Low and High Beams (All)Headlamps Inoperative - Low and High Beams 
(With Front Wipers On)  

z

Headlamps Inoperative - Flash to Pass  

z

High Beam Indicator Always On  

z

High Beam Indicator Inoperative  

z

Interior Backlighting Does Not Dim  

z

Interior Backlighting Inoperative  

z

Instrument Panel (I/P) Compartment Lamp Inoperative  

z

Instrument Panel (I/P) Compartment Lamp Always On  

z

Off-Road Lamps Always On  

z

Off-Road Lamps Inoperative  

z

Park, License, and Tail Lamps Always On  

z

Park, License, and Tail Lamps Inoperative  

z

Reading Lamp(s) Inoperative  

z

Stop Lamps Always On  

z

Stop Lamps Inoperative  

z

Turn Signal Lamps and/or Indicators Always On or Flashing  

z

Turn Signal Lamps and/or Indicators Inoperative  

z

Vanity Mirror Lamp(s) Inoperative  

BACKUP LAMPS ALWAYS ON 

Backup Lamps Always On 

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics 
Connector End View Reference: Lighting Systems Connector End Views or Body Control System 
Connector End Views in Body Control System

1

Did you perform the Lighting Systems 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Lighting Systems

2

Verify that the backup lamps are always on. 
Do the backup lamps operate normally?

Go to Testing for 

Intermittent Conditions and 

Poor Connections in Wiring 

Systems

Go to Step 3

3

Use the scan tool to check if there are any 
codes set in the current or history Powertrain 
DTC Information. 
Are any codes present?

Go to the Diagnostic System 

Check in the appropriate 

Transmission Section

Go to Step 4

Test the backup lamp supply voltage circuit of 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2