Hummer H2. Manual — part 432

3

1. Connect a test lamp to a good ground.

2. Backprobe both of the mirror fold motor control

circuits one at a time with the test lamp.

Does the test lamp illuminate at either test point?

-

Go to

Step

6

Go to Step 4

4

1. Connect a test lamp to battery voltage.

2. Backprobe both of the mirror fold motor control

circuits one at a time with the test lamp.

Does the test lamp illuminate at either test point?

-

Go to

Step

6

Go to Step 5

5

1. Disconnect the power mirror.

2. Test for continuity through the mirror fold motor

and the mirror fold motor control circuits.

Is there continuity?

-

Go to

Step

7

Go to Step 6

6

Inspect for poor connections at the harness connector of
the power mirror. Refer to Testing for Intermittent
Conditions and Poor Connections 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 appropriate door module. Refer to Testing for
Intermittent Conditions and Poor Connections in
Wiring Systems.
Did you find and correct the condition?

-

Go to

Step

10

Go to Step 9

8

Replace the appropriate power mirror. Refer to Mirror
Replacement .
Did you complete the replacement?

-

Go to

Step

10

-

9

Replace the appropriate door module. Refer to Switch
Replacement - Door Lock and Side Window - Driver
or Switch Replacement - Door Lock and Side
Window - Passenger .Did you complete the
replacement?

IMPORTANT:

Perform the set up procedure for the driver door
module. Refer to Service Programming System (SPS)
in Programming.

-

Go to

Step

10

-

10

1. Use the scan tool in order to clear the DTCs.

2. Operate the vehicle within the Conditions for

Running the DTC as specified in the supporting
text.

Does the DTC reset?

-

Go to

Step

2

System OK

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

DTC B3808

Circuit Description

The Body Control Module (BCM) internally grounds the door lock relay control circuit for the rear door lock
relay when it receives a Class 2 message from the Driver Door Module (DDM) or Passenger Door Module
(PDM). When the BCM grounds the door lock relay control circuit the rear door lock relay is energized and
locks the rear doors.

Conditions for Running the DTC

z

Battery voltage is between 9.0-16.0 volts.

z

The DTC will set if the rear door lock function is active or inactive.

Conditions for Setting the DTC

The DTC will set if the door lock relay control circuit is shorted to ground or open for more then one second.

Action Taken When the DTC Sets

z

If a short to ground is present on the door lock relay control circuit, the door lock relay will be energized
and the rear door lock actuators will be held in the lock position and will not unlock.

z

If an open condition is present on the door lock relay control circuit, the rear doors will unlock but not
lock.

Conditions for Clearing the DTC

When the fault is no longer present, the BCM changes the current DTC to a history DTC. The BCM will clear
the history DTC after 50 fault free ignition cycles.

Diagnostic Aids

z

DTC B3808 could also set if the door lock relay winding is open.

z

If both DTC B3808 and B3809 are set as current, the battery positive voltage circuit or the LOCKS fuse
could be open. If the LOCKS fuse is open, the cause is most likely one of the following:

{

A short to ground in the relay battery positive voltage circuit.

{

A short to ground in the door lock actuator lock or unlock control circuits.

Test Description

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

2: Listen for an audible click when the rear door lock relay operates. Command both the ON and OFF
states. Repeat the commands as necessary.

3: Tests for voltage at the coil side of the rear door lock relay. The LOCKS fuse supplies power to the
coil side of the rear door lock relay.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

4: Verifies that the body control module is providing ground to the rear door lock relay.

5: Tests if ground is constantly being applied to the rear door lock relay.

DTC B3808

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics
Connector End View Reference:Power Door Systems Connector End Views

1

Did you perform the Door Systems Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Door Systems

2

1. Install a scan tool.

2. With a scan tool, command the rear door lock

relay ON and OFF.

Does the rear door lock relay turn ON and OFF
with each command?

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

Go to Step 3

3

1. Remove the rear door lock relay.

2. Probe the battery positive voltage circuit of

the rear door lock relay with a test lamp that
is connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

4

1. Connect a test lamp between the door lock

relay control circuit and the battery positive
voltage circuit of the rear door lock relay.

2. With a scan tool, command the rear door lock

ON and OFF.

Does the test lamp turn ON and OFF with each
command?

Go to Step 9

Go to Step 5

5

Does the test lamp remain illuminated without
being commanded?

Go to Step 7

Go to Step 6

6

Test the door lock relay control circuit of the rear
door lock relay for an open. Refer to Circuit
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 14

Go to Step 10

7

Test the door lock relay control circuit of the rear
door lock relay for a short to ground or an open.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 14

Go to Step 10

Test for an open or short to ground in the battery
positive voltage circuit of the rear door lock relay.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

DTC B3809

Circuit Description

The Body Control Module (BCM) internally grounds the door unlock relay control circuit for the rear door
unlock relay when it receives a Class 2 message from the Driver Door Module (DDM) or Passenger Door
Module (PDM). When the BCM grounds the door unlock relay control circuit the rear door unlock relay is
energized and unlocks the rear doors.

Conditions for Running the DTC

8

Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you complete the repair?

Go to Step 14

Go to Step 11

9

Inspect for poor connections at the rear door lock
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 13

Go to Step 12

10

Inspect for poor connections at the harness
connector of the body control module. 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 14

Go to Step 13

11

Repair the short to ground in the door lock actuator
lock or unlock circuits. Refer to Wiring Repairs in
Wiring Systems.
Did you complete the repair?

Go to Step 14

-

12

Replace the rear door lock relay.
Did you complete the replacement?

Go to Step 14

-

13

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

IMPORTANT:

Perform the set up procedure for the body
control module.

Go to Step 14

-

14

1. Use the scan tool in order to clear the DTCs.

2. Operate the vehicle within the Conditions for

Running the DTC as specified in the
supporting text.

Does the DTC reset?

Go to Step 2

System OK

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2