Question about 2003 Pontiac Bonneville

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I have a 2003 bonneville. tried to start car nothing, no click or anything. put in new starter/selinoid, battery, ignition switch. Checked all fusses which were good.

All new relay's dealing with ignition. Can't check anti-theft, display not working. Radio has been in and out for weeks, but had no problems. Iam lost, please help. Ray

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  • Pontiac Master
  • 11,488 Answers

If it were a anti-theft problem the engine would crank over and start for a couple seconds then die ! PCM - engine computer disables fuel injectors , not the starter like ford PATS systems . You need to know how the starter system works before you can repair them . And replacing parts isn't the way to do it . You people on here must have money to burn . Make parts stores rich .The ignition switch is a input to the BCM - body control module or body control system , made up of Three different modules .
The body control system consists of the following 3 modules:
• The dash integration module (DIM)
• The instrument panel integration module (IPM)
• The rear integration module (RIM)
Each of the 3 body control modules integrate a number of functional systems under the control of a single module. Each of the modules are connected to the Class 2 serial data line; many control signals are implemented by Class 2 messages.
The DIM is wired to the class 2 serial data line. The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.
The DIM functions include the following:
• Control of headlights and exterior lamps
• Horn relay control
• Interior lamps incandescent dimming
• Lamps On signal with wiper/washer
• Power moding control over Class 2 serial data line
• Steering wheel controls
• Storage of the clock settings and, sending a message out on the class 2 serial data circuit in response to requests from other modules
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 DIM. The PMM receives 4 signals from the ignition switch.
To determine the correct power mode the PMM uses the following circuits:
• Accessory voltage
• Ignition 1 voltage
• Ignition 3 voltage
• Off/Run/Crank voltage
Your best bet is to take your vehicle to a qualified repair shop that has the tool and the factory service repair manual .

Posted on Dec 13, 2016

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