Hummer H2. Manual - part 2644

Fig. 3: Stop Lamp Switch Component Views 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 3 

AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL CONNECTOR END VIEWS 

A/T Shift Lock/Park Lock Control Terminal Identification 

Callout

Component Name

1

Vacuum Booster

2

Brake Pedal

3

Stop Lamp Switch

4

Accelerator Pedal

5

Stop Lamp Switch Retainer

6

Dash Panel

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2

  

Stop Lamp Terminal Identification Switch 

Connector Part Information

z

12064762  

z

6-Way F Metri-Pack 150 Series (GY)  

Pin

Wire Color

Circuit No.

Function

A

BK

1050

Ground

B

L-GN/BK

584

Park Lock Control Solenoid Supply Voltage

C

YE

1996

Remote Shift Selector Signal

D

-

-

Not Used

E

D-GN/WH

1135

A/T Shift Lock Control Solenoid Supply Voltage

F

PK

1020

Ignition 0 Voltage

Connector Part Information

z

12040551  

z

6-Way F Metri-Pack 480 Series (BK)  

Pin

Wire Color

Circuit No.

Function

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2

  

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL 

Begin the system diagnosis by reviewing the Automatic Transmission Shift Lock Control Description and 
Operation . Reviewing the description and operation information will help you determine the correct symptom 
diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also 
help you determine if the condition described by the customer is normal operation. 

Refer to Symptoms - Automatic Transmission Shift Lock Control in order to identify the correct procedure 
for diagnosing the system and where the procedure is located. 

SYMPTOMS - AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL 

Visual/Physical Inspection 

z

Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock 
control 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

Shift Lever Does Not Move with Brake Pedal Depressed  

z

Shift Lever Can Be Moved without Brake Pedal Depressed  

PARK LOCK SOLENOID INOPERATIVE 

A

WH

17

Stop Lamp Switch Signal

B

OR

1540

Battery Positive Voltage

C

BN

441

Ignition 3 Voltage

D

PU

420

TCC Brake Switch/Cruise Control Release Signal

E

L-GN/BK

584

A/T Shift Lock Control Switch Supply Voltage

F

D-GN/WH

1135

A/T Shift Lock Control Solenoid Supply Voltage

IMPORTANT: Review the system operation in order to familiarize yourself with the system 

functions. Refer to Automatic Transmission Shift Lock Control Description and 
Operation .

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2

  

Park Lock Solenoid Inoperative 

SHIFT LEVER DOES NOT MOVE WITH BRAKE PEDAL DEPRESSED 

Shift Lever Does Not Move with Brake Pedal Depressed 

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 OFF.

1

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

Go to 

Step 2

Go to Symptoms - Automatic 

Transmission Shift Lock 

Control

2

1. Move the shift lever to the PARK position.  

2. Turn OFF the ignition.  

3. Press and hold the brake pedal.  

4. 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. Disconnect the park lock solenoid.  

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 

Step 4

Go to Step 5

4

Inspect for poor connections at park lock 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 7

Go to Step 6

5

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

Go to 

Step 7

-

6

Replace the park lock solenoid. Refer to Automatic 
Transmission Shift Lock Actuator Replacement . 
Did you complete the repair?

Go to 

Step 7

-

7

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 

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2