Hummer H2. Manual — part 172

value?

Go to Step 4

Go to Step 9

4

1. Turn OFF the ignition.

2. Connect a 3 amp fused jumper wire

between the signal circuit of the
Passlock(tm) sensor and the ground
circuit of the Passlock(tm) sensor.

3. Turn ON the ignition, with the engine

OFF.

4. With a scan tool observe the Passlock

(tm) Data Voltage in the Body Control
Module Security Data list.

Does the scan tool indicate that the Passlock
(tm) Data Voltage is less than the specified
value?

0.4 V

Go to Step 5

Go to Step 7

5

1. Disconnect the fused jumper wire.

2. Measure the voltage between the 12V

reference circuit of the Passlock(tm)
sensor and the ground circuit of the
Passlock(tm) sensor.

Does the voltage measure less than the
specified value?

12.0 V

Go to Step 6

Go to Step 11

6

Test the 12V reference circuit of the Passlock
(tm) sensor for a high resistance 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 9

7

Test the signal circuit of the Passlock(tm)
sensor for a short to voltage, a high resistance,
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 8

8

Test the ground circuit of the Passlock(tm)
sensor for a high resistance 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 9

9

Inspect for poor connections at the BCM.
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 10

IMPORTANT:

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

DTC B2960

Circuit Description

The Passlock(tm) system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to
rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The body control
module (BCM) provides security system sensor power and low reference for the Passlock(tm) sensor. The BCM
also measures the security system sensor voltage.

When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock(tm)

10

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

When replacing the BCM, refer to Body
Control Module (BCM) Programming/RPO
Configuration in Body Control System.

-

Go to Step 14

-

11

Inspect for poor connections at the Passlock
(tm) sensor. 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 12

12

Replace the Passlock(tm) sensor in the
electronic column lock module assembly.
Refer to Ignition Lock Cylinder Case
Replacement in Steering Wheel and Column.
Did you complete the replacement?

-

Go to Step 13

-

13

Perform the Programming Theft Deterrent
System Components procedure.
Is the repair complete?

-

Go to Step 14

-

14

1. Use the scan tool in order to clear the

DTCs.

2. Turn OFF the ignition.

3. Momentarily rotate the ignition switch

to CRANK. Do not start the vehicle.

4. Release the ignition switch to ON.

5. Select the body control module display

DTCs function on the scan tool.

Does the DTC reset?

-

Go to Step 3

Go to Step 15

15

Attempt to start the vehicle.
Does the engine start and run?

-

System OK

Go to Step 3

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock
(tm) sensor which completes a circuit from the security sensor signal circuit through a resistor to the security
sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the
voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the
voltage measured is within the valid range, the BCM will send a class 2 message to the powertrain control
module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2
message will be sent to the PCM to disable starting of the vehicle.

Conditions for Setting the DTC

z

The BCM will inspect for a valid code when the ignition is rotated from ON to CRANK and will continue
to monitor the signal during the engine running period.

z

The BCM is reading a valid but different code value than previously learned form the Passlock(tm)
sensor.

Action Taken When the DTC Sets

z

The vehicle will not start if the fault occurs before you start the vehicle. The security indicator will be
FLASHING.

z

If the vehicle is running when the fault occurs, the BCM will be in the fail enable mode allowing the
vehicle to start and run. The security indicator will be ON.

Conditions for Clearing the DTC

z

The DTC will clear once an ignition cycle occurs without the fault recurring.

z

The BCM history codes will clear once 100 concurrent ignition cycles occur without the fault recurring.

z

Using a scan tool.

Diagnostic Aids

z

Use a scan tool in order to inspect the Passlock(tm) data voltage and the Passlock(tm) code.

z

Inspect for poor connections at the Passlock(tm) sensor. Refer to Testing for Intermittent Conditions
and Poor Connections in Wiring Systems.

Test Description

The number below refers to the step number on the diagnostic table:

6: Tests for the proper operation of the circuit in the normal voltage range.

DTC B2960

Step

Action

Value

(s)

Yes

No

Schematic Reference:Theft Deterrent System Schematics
Connector End View Reference:Theft Deterrent System Connector End Views

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

1

Did you perform the Vehicle Theft Deterrent
(VTD) Diagnostic System Check?

-

Go to Step 2

Go to Diagnostic System
Check - Theft Deterrent

2

1. Install a scan tool.

2. Momentarily rotate the ignition switch to

CRANK. Do not start the vehicle.

3. Release the ignition switch to ON.

4. Select the body control module (BCM)

display DTCs function on the scan tool.

Does the scan tool display DTC B2960 as a
current DTC?

-

Go to Step 3

Go to Testing for

Intermittent Conditions

and Poor Connections

in Wiring Systems

3

Does the scan tool display DTC B2947,
B2948, B2957, or B2958?

-

Go to

Diagnostic

Trouble Code

(DTC) List

Go to Step 4

4

Have you replaced the Passlock(tm) sensor on
this vehicle?

-

Go to Step 5

Go to Step 6

5

Have you performed a Passlock(tm) learn
procedure after replacing the Passlock(tm)
sensor?

-

Go to Step 6

Go to Step 9

6

With a scan tool, observe the Passlock(tm) data
voltage for one minute.
Does the scan tool indicate that the Passlock
(tm) data voltage is changing more than the
specified value?

+/-

0.02 V

Go to Step 7

Go to Step 9

7

Inspect for poor connections at the Passlock
(tm) sensor. 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

8

Replace the Passlock(tm) sensor in the
electronic column lock module assembly.
Refer to Ignition Lock Cylinder Case
Replacement in Steering Wheel and Column.
Did you complete the replacement?

-

Go to Step 9

-

9

Perform the Programming Theft Deterrent
System Components procedure.
Is the repair complete?

-

Go to Step 10

-

1. Use the scan tool in order to clear the

DTCs.

2. Turn OFF the ignition.

IMPORTANT:

Do not start the vehicle.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2