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Pontiac Grand Prix GT I have a problem with my 2005 Pontiac

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I have a problem with...
I have a problem with my 2005 Pontiac Grand Prix GT I have never heard of before. Last night I parked in my driveway and removed the key, but the car kept running, even with the keys in my pocket! After hours it finally shut off, but minutes later the anti theft system started going off. Had to restart the car again, and was only able to stop the engine by pulling the ignition fuse. Now the car will not start at all.Any suggestions of what this is?
Submitted: 6 years ago.Category: Pontiac
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Answered in 11 minutes by:
2/13/2011
Pontiac Mechanic: Bill, Pontiac Technician replied 6 years ago
Bill
Bill, Pontiac Technician
Category: Pontiac
Satisfied Customers: 1,776
Experience: GM Certified Master Technician
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Hello,

First off, do you have any aftermarket accessories installed in the vehicle such as a remote start or alarm system?

Thanks

Bill

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Customer reply replied 6 years ago
No> There is a remote starter that is factory installed and built into GM Key Fob, as well as a factory installed anti theft system
Pontiac Mechanic: Bill, Pontiac Technician replied 6 years ago

There are a few possibilities here such as wiring harness issues or an ignition switch however by far the most probable cause of your concern is the body control module (BCM). The BCM , in addition to controlling various functions such as interior lights, some hvac,theft deterrant and door lock functions, doubles as what is called the power mode master. This basically means the ignition switch is wired only to the BCM and the BCM controls power to all of the other modules in the vehicle. It is impossible to tell without reading scan data and comparing the commanded power state to the actual power state however the BCM is the most probable cause although it should be confirmed with a proper scan tool. Replacement will have to be done professionally as programming with a computer attached to a GM server is necessary.

Bill

 

 

2005 Pontiac Grand Prix | Grand Prix VIN W Service Manual | Accessories | | Document ID:(NNN) NNN-NNNN


Power Mode Description and Operation

Power to many of this vehicle's circuits are controlled by the module that is designated the power mode master (PMM). This vehicle PMM is the body control module (BCM). The PMM controls which power mode (Run, Accessory, Crank, Retained Accessory Power, or Off) is active.

Serial Data Power Mode

On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits. The table below illustrates the state of these inputs in correspondence to the ignition switch position:

3-Wire Ignition Switch Table

Ignition Switch Position

Ignition 1

Ignition 3

Crank

Power Mode Transmitted

Off

0

0

0

OFF/Awake or RAP

Start

1

0

1

Crank

Accessory

0

1

0

Accessory

Run

1

1

0

Run

Relay Controlled Power Mode

The body control module (BCM) uses the discrete ignition switch inputs ignition 1, ignition 3 and crank to distinguish the correct power mode. Once the BCM has determined the power mode selected by the vehicle operator it will energize the Ignition relay, Run relay and retained accessory power (RAP) relay, depending on which power mode is selected.

Ignition 1 Relay

The relay uses a Hot At All Times B+ power source derived from the underhood electrical center. The ignition 1 relay supplies a power signal to the following circuits when the Run or Crank power mode is selected:

AC clutch relay
ABS STG angle sensor
Antilock brake system (ABS) yaw sensor
Auxiliary power drop connector
Crank relay
Cruse control switch
Electronic brake control module (EBCM)
Engine control module (ECM)
Heating, ventilation, and air conditioning module (HVAC)
Ignition control module (ICM)
Instrument panel cluster (IPC)
Sensing and diagnostic module (SDM)
Transmission solenoid circuit

Retained Accessory Power (RAP) Relay

The RAP relay is energized when the Run or Accessory power mode has been selected. The relay uses a Hot At All Times B+ power source derived from the underhood electrical center. The B+ power source is protected by the 50 Amp BATT MAIN 2 fuse. The BCM also energizes the relay for 10 minutes after the vehicle operator transitions the ignition switch from Accessory to OFF or Run to OFF positions. The following circuits are controlled by the RAP relay:

Power sunroof
Power windows

Fail-Safe Operation

Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the power mode master (PMM) fail to send a power mode message. The fail-safe plan covers those modules using exclusively serial data control of power mode as well as those modules with discrete ignition signal inputs.

Serial Data Messages

The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid PMM message until they can check for the engine run flag status on the serial data circuits. If the PMM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is True, indicating that the engine is running, the modules fail-safe to RUN. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is False, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.

Discrete Ignition Signals

Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 volts, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.

BCM Wake-Up/Sleep States

The body control module (BCM) is able to control or perform all of the BCM functions in the wake-up state. The BCM enters the sleep state when active control or monitoring of system functions has stopped, and the BCM has become idle again. The BCM must detect certain wake-up inputs before entering the wake-up state. The BCM monitors for these inputs during the sleep state, where the BCM is able to detect switch transitions that cause the BCM to wake-up when activated or deactivated. Multiple switch inputs are needed in order to sense both the insertion of the ignition key and the power mode requested. This would allow the BCM to enter a sleep state when the key is IN or OUT of the ignition.

The BCM will enter a wake-up state if any of the following wake-up inputs are detected:

Activity on the serial data line
Detection of a battery disconnect and reconnect condition
Headlamps are ON.
Ignition is turned ON.
Key-in-ignition switch
Park lamps are ON.

The BCM will enter a sleep state when all of the following conditions exist:

The ignition switch is OFF.
No activity exists on the serial data line.
No outputs are commanded.
No delay timers are actively counting.
No wake-up inputs are present.

If all these conditions are met the BCM will enter a low power or sleep condition. This condition indicates that the BCM, which is the power mode master (PMM) of the vehicle, has sent an OFF-ASLEEP message to the other systems on the serial data line.

© 2011 General Motors. All rights reserved.

 

Bill
Bill, Pontiac Technician
Category: Pontiac
Satisfied Customers: 1,776
Experience: GM Certified Master Technician
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