I noticed in a post i read, that you were sending someone an electrical schematic via email, and was wondering if you could help me out. Everything in my car is electrical, and when i go to start the car after it has gotten hot (on a road trip and stopping for something to drink) it won't want to start. With the key on, my radio turns on and runs fine, but my dashboard won't turn on and it wont trigger the starter. It is an electronic starter. could you plz give me a suggestion as to what i might be able to do? plz reply to [email protected]
Power to many of this vehicle's circuits are controlled by the module that is designated the Power Mode Master (PMM). This vehicle's PMM is the Body Control Module (BCM). The PMM controls which power mode (Run, Accessory, Crank, 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). The BCM is the PMM on this vehicle. The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Class 2 Serial Data circuit.
To determine the correct power mode the PMM uses the following circuits:
• Ignition 0
• Ignition 1
• Ignition 3
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.
Do you know what class 2 is ?
Class 2 Serial Data Link
The following modules use the class 2 serial data link to communicate with each other:
• The body control module (BCM)
• The digital radio receiver (DRR)
• The electronic brake control module (EBCM)
• The inflatable restraint sensing and diagnostic module (SDM)
• The powertrain control module (PCM)
• The radio
• The vehicle theft deterrent (VTD)
The class 2 serial data link also allows a scan tool to communicate with the above modules for diagnostic and testing purposes.
The class 2 serial data link on this vehicle is configured in a star pattern. There is no redundant path for the serial data to flow through. If a class 2 serial data circuit develops an open condition, the module connected by that circuit will not be able to communicate.
It is an electronic starter. ????? No it's not ! View a starter circuit here at http://www.bbbind.com/free_tsb.html Enter vehicle info. under system click on engine ,then under sub system click starting .
SOURCE: Car won't start
If you cannot hear the starter motor, check fuses, there can be a broken contact to motor or ignition barrel faulty.
SOURCE: my 1996 grand am wont start
if the car doesnt make a sound when trying to start it. it can be a possibility it is your alternador. the reason why it didnt shut off on you while you were driving was you were most likely driving off of your battery and not the alternador. I have the same exact car and i been thru hell and back and then back to hell with it. I had a problem where my alternador wasnt charging the battery so after driving for about 30 mins the car shut off. I got a new alternador and my battery light came on. i was able to drive it. (i also had a brand new battery). I took it to a shop to see what was wrong and the alternador wasnt charging up the battery, So in other words i was using the battery to drive. And if you are driving using the power of your batter only, it is very important you do not use anything that would help use it, such as radio, windsheild wipers or even your head lights (and i know yours come on automatically), if ur windows are powered used, try not to keep rolling them up or down. and it is very possible to drive off of the battery if you are not using any other power used things in the car. And if its not your alternador than most def its an electric problem (i had one of those too)
SOURCE: Igntion
I have seen two differnet things cause this. A bad ignition switch can cause this. I have also seen windshields leak and the water runs across the headliner, down the front left windshield trim and into the fuse block, which is where all of the modules Class 2 data wires meet, and then the water will short the power circuits. If it has gone long enough like this you can pull the relays out of the left fuse block in the dash and find green corrosion on the back of the relays and in the fuse block.
Used parts such as starters and altinators don't last. It might **** but it sounds like you need to buy a new starter,altinator, and battery. Or just start with buying one at a time.
Testimonial: "kellertech1?? i tried something new.. my batt. was dead after sitting for 5hrs so i jumped it & later unhooked the batt. & hooked the batt. back up next day & car started ok kinda a weak start but started. so can a starter drain a batt or where should i look for a short or could this be a weak batt. that tested good but 2 weak 2 start the car."
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i'm experienceing the same problem, but my radio won't come on at all now. please. please, send me or tell me where i can find an electrical schematic to try to solve this. [email protected]
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