Hummer H2. Manual — part 442
7
2. Connect a test lamp to a good ground.
3. Probe the door unlock relay coil battery
supply voltage circuit.
Does the test lamp illuminate?
Go to Step 8
Go to Step 27
8
1. Connect a test lamp to battery positive
voltage.
2. Probe the door actuator unlock control circuit
cavity in the fuse block.
Does the test lamp illuminate?
Go to Step 10
Go to Step 9
9
1. Install the rear door unlock relay.
2. Remove the rear door lock relay.
3. Connect a test lamp to battery positive
voltage.
4. Probe the door lock actuator lock control
circuit cavity in the fuse block.
Does the test lamp illuminate?
Go to Step 11
Go to Step 27
10
1. Connect a test lamp to battery positive
voltage.
2. Probe the rear door unlock relay control
circuit.
Does the test lamp illuminate?
Go to Step 22
Go to Step 26
11
1. Connect a test lamp to battery positive
voltage.
2. Probe the rear door lock relay control circuit.
Does the test lamp illuminate?
Go to Step 23
Go to Step 25
12
1. Remove the rear door lock relay.
2. Connect a test lamp to a good ground.
3. Probe the battery positive voltage circuit
(high current) cavity in the fuse block.
Does the test lamp illuminate?
Go to Step 13
Go to Step 27
13
With the test lamp connected to a good ground,
probe the lock relay control circuit cavity in the
fuse block.
Does the test lamp illuminate?
Go to Step 22
Go to Step 14
1. Connect a test lamp to battery positive
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2
14
voltage.
2. Probe the lock relay control circuit cavity in
the rear fuse block.
3. Activate a door lock switch to the lock
position.
Does the test lamp illuminate?
Go to Step 15
Go to Step 22
15
With the test lamp connected to battery positive
voltage, probe the door lock actuator lock control
circuit cavity in the fuse block.
Does the test lamp illuminate?
Go to Step 25
Go to Step 16
16
1. Remove the rear door unlock relay.
2. With the test lamp connected to battery
positive voltage, probe the unlock relay
ground circuit cavity in the fuse block.
Does the test lamp illuminate?
Go to Step 26
Go to Step 27
17
1. Remove the rear door unlock relay.
2. Connect a test lamp to a good ground.
3. Probe the battery positive voltage circuit
(high current) cavity in the fuse block.
Does the test lamp illuminate?
Go to Step 18
Go to Step 27
18
With the test lamp connected to a good ground,
probe the unlock relay control circuit cavity in the
fuse block.
Does the test lamp illuminate?
Go to Step 23
Go to Step 19
19
1. Connect a test lamp to battery positive
voltage.
2. Probe the unlock relay control circuit cavity
in the fuse block.
3. Activate a door lock switch to the unlock
position.
Does the test lamp illuminate?
Go to Step 20
Go to Step 23
20
With the test lamp connected to battery positive
voltage, probe the door lock actuator unlock
control circuit cavity in the rear fuse block.
Does the test lamp illuminate?
Go to Step 25
Go to Step 21
21
1. Remove the rear door lock relay.
2. With the test lamp connected to battery
positive voltage, probe the lock relay ground
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2
circuit cavity in the rear fuse block.
Does the test lamp illuminate?
Go to Step 25
Go to Step 27
22
Test for an open short to ground or short to battery
in the door lock relay lock control circuit.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
Go to Step 33
Go to Step 28
23
Test for an open short to ground or short to battery
in the door unlock relay lock control circuit.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
Go to Step 33
Go to Step 28
24
Test for a short to ground in the door lock actuator
lock and unlock control circuits.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
Go to Step 33
Go to Step 27
25
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 33
Go to Step 29
26
Inspect for poor connections at the rear door unlock
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 33
Go to Step 30
27
Inspect for poor connections at the fuse block.
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 33
Go to Step 31
28
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 33
Go to Step 32
29
Replace the rear door lock relay.
Did you complete the repair?
Go to Step 33
-
30
Replace the rear door unlock relay.
Did you complete the repair?
Go to Step 33
-
31
Replace the rear fuse block.
Did you complete the repair?
Go to Step 33
-
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2
POWER DOOR LOCKS INOPERATIVE - ONE DOOR OR SWITCH
Power Door Locks Inoperative - One Door or Switch
32
Replace the BCM. Refer to Body Control Module
Replacement in Body Control System.
Did you complete the repair?
Go to Step 33
-
33
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Step
Action
Yes
No
Schematic Reference: Door Lock/Indicator Schematics
Connector End View Reference: Power Door Systems Connector End Views
DEFINITION: This diagnostic table should be used to diagnose a failure of the rear door lock switch or
one rear door lock actuator.
1
Did you perform the Door Systems Diagnostic
System Check?
Go to Step 2
Go to Diagnostic
System Check -
Door Systems
2
Activate the rear door lock switch to the lock and
unlock positions.
Do both rear passenger doors lock and unlock?
Go to Testing for
Intermittent Conditions
and Poor Connections in
Wiring Systems
Go to Step 3
3
1. Install a scan tool.
2. Monitor the rear door lock switch data
parameter in the BCM data list.
Is the data parameter active without a switch
activation?
Go to Step 5
Go to Step 4
4
1. With the scan tool, monitor the rear door lock
switch data parameter in the BCM data list.
2. Activate the door lock switch to both the lock
and unlock positions.
Does the data parameter change with each switch
activation?
Go to Step 7
Go to Step 6
5
Disconnect the rear door lock switch.
Does the data parameter now display an inactive
state?
Go to Step 10
Go to Step 9
6
1. Disconnect the rear door lock switch.
2. Connect a test lamp to ground.
3. Probe the rear door lock switch ground circuit.
Does the test lamp illuminate?
Go to Step 9
Go to Step 13
1. Disconnect the inoperative door lock actuator.
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2
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