Hummer H2. Manual — part 2645

Views or Automatic Transmission Related Connector End Views
DEFINITION: Transmission shift lever will not move out of the PARK position with the ignition ON
and the brake pedal pressed.

1

Did you perform the Symptoms - Automatic
Transmission Shift Lock Control tests and all the
necessary inspection?

Go to Step 2

Go to Symptoms -

Automatic

Transmission Shift

Lock Control

2

1. Turn ON the ignition, with the engine OFF.

2. Press and hold the brake pedal.

3. Attempt to move the shift lever out of the

PARK position.

Does the shift lever move out of the PARK
position?

Go to Testing for

Intermittent

Conditions and Poor

Connections in Wiring

Systems

Go to Step 3

3

1. Turn OFF the ignition.

2. Disconnect the automatic transmission shift

lock control switch.

3. Turn ON the ignition, with the engine OFF.

4. Press and hold the brake pedal.

5. Attempt to move the transmission shift lever

out of the PARK position.

Does the transmission shift lever move out of the
PARK position?

Go to Step 6

Go to Step 4

4

1. Turn OFF the ignition.

2. Disconnect the automatic transmission shift

lock control solenoid.

3. Turn ON the ignition, with the engine OFF

4. Press and hold the brake pedal.

5. Attempt to move the transmission shift lever

out of the PARK position.

Does the transmission shift lever move out of the
PARK position?

Go to Step 7

Go to Step 5

5

Inspect for poor connections at the harness
connector of the automatic transmission shift lock
control solenoid. 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 10

Go to Step 9

Inspect for poor connections at the harness
connector of the automatic transmission shift lock

2004 Hummer H2

2004 TRANSMISSION Shift Lock Control - Hummer H2

SHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED

Shift Lever Can Be Moved without Brake Pedal Depressed

6

control switch. 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 10

Go to Step 8

7

Repair the short to battery positive voltage in the
A/T shift lock control solenoid supply voltage
circuit. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you complete the repair?

Go to Step 10

-

8

Replace the automatic transmission shift lock
control switch. Refer to Stop Lamp Switch
Replacement in Lighting Systems.
Did you complete the replacement?

Go to Step 10

-

9

Replace the automatic transmission shift lock
control solenoid. Refer to Automatic
Transmission Shift Lock Actuator
Replacement .
Did you complete the replacement?

Go to Step 10

-

10

Operate the system in order to verify the repair.
Did you find and correct the condition?

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference:Automatic Transmission Shift Lock Control Schematics
Connector End View Reference: Automatic Transmission Shift Lock Control Connector End
Views or Automatic Transmission Related Connector End Views
DEFINITION: Transmission shift lever does not lock in the PARK position with the ignition ON and the
brake pedal not pressed.

1

Did you perform the Symptoms - Automatic Transmission
Shift Lock Control tests and all the necessary inspections?

Go to

Step 2

Go to Symptoms -

Automatic Transmission

Shift Lock Control

2

1. Apply the parking brake and block the wheels.

2. Turn ON, the ignition, with the engine OFF.

3. Attempt to move the shift lever out of the PARK

position.

Does the shift lever move out of the PARK position?

Go to

Step 3

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

3

1. Turn OFF the ignition.

2. Ensure transmission shift lever is in the PARK

position.

3. Connect a test lamp between the A/T shift lock switch

supply voltage circuit at the BTSI fuse and a good

2004 Hummer H2

2004 TRANSMISSION Shift Lock Control - Hummer H2

ground.

4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to

Step 4

Go to Step 8

4

Connect a test lamp between the A/T shift lock switch
supply voltage circuit at the automatic transmission shift
lock control switch and a good ground.
Does the test lamp illuminate?

Go to

Step 5

Go to Step 14

5

1. Connect a test lamp between the A/T shift lock

solenoid control circuit at the automatic transmission
shift lock control switch and a good ground.

2. Press and release the brake pedal several times.

Does the test lamp turn ON and OFF with the brake pedal?

Go to

Step 6

Go to Step 11

6

Connect a test lamp between the automatic transmission
shift lock control solenoid supply voltage circuit at the
automatic transmission shift lock control solenoid and a
good ground.
Does the test lamp illuminate?

Go to

Step 7

Go to Step 15

7

Test the automatic transmission shift lock control solenoid
ground circuit for an open or high resistance. Refer to
Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to

Step 20

Go to Step 12

8

1. Turn OFF the ignition

2. Disconnect the park/neutral position switch connector.

3. Connect a test lamp between the ignition 1 voltage

circuit of the park/neutral position switch and a good
ground.

4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to

Step 9

Go to Step 13

9

1. Turn OFF the ignition

2. Connect a 10 amp fused jumper between the ignition

1 voltage circuit of the park/neutral position switch
and the park/neutral position switch park signal circuit
at the park/neutral position switch connector.

3. Connect a test lamp between the A/T shift lock switch

supply circuit at the BTSI fuse and a good ground.

4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to

Step 10

Go to Step 16

1. Inspect for proper park/neutral position switch

2004 Hummer H2

2004 TRANSMISSION Shift Lock Control - Hummer H2

10

adjustment. Refer to Park/Neutral Position Switch
Adjustment in Automatic Transmission 4L60-E.

2. Inspect for poor connections at the harness connector

of the park/neutral position switch. 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 20

Go to Step 17

11

Inspect for poor connections at the harness connector of the
automatic transmission shift lock control switch. 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 20

Go to Step 18

12

Inspect for poor connections at the harness connector
automatic transmission shift lock control solenoid. 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 20

Go to Step 19

13

Repair the open or short in the ignition 1 voltage circuit of
the park/neutral position switch. Refer to Circuit Testing
and Wiring Repairs in Wiring Systems.
Did you complete the repair?

Go to

Step 20

-

14

Repair the open or short in the A/T shift lock switch supply
voltage circuit. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you complete the repair?

Go to

Step 20

-

15

Repair the open in the A/T shift lock control solenoid
supply voltage circuit. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you complete the repair?

Go to

Step 20

-

16

Repair the open or short in the park/neutral position switch
park signal circuit. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you complete the repair?

Go to

Step 20

-

17

Replace the park/neutral position switch. Refer to
Park/Neutral Position Switch Replacement in Automatic
Transmission 4L60-E.
Did you complete the replacement?

Go to

Step 20

-

18

Replace the automatic transmission shift lock control
switch. Refer to Stop Lamp Switch Replacement in
Lighting Systems.
Did you complete the replacement?

Go to

Step 20

-

19

Replace the automatic transmission shift lock control
solenoid. Refer to Automatic Transmission Shift Lock
Actuator Replacement .

Go to

2004 Hummer H2

2004 TRANSMISSION Shift Lock Control - Hummer H2