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2001 Buick Lesabre...no power to anything forward of the windshield. winshield back is ok.all fuses are good. scanning tool is blank??? has only 71k miles on it. prior to going blank showed C1242

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  • Jeff Armer Dec 06, 2016

    Is there b+ voltage at pin 16 in the DLC (where you plug in the scan tool )

  • Jeff Armer Dec 06, 2016

    You need to under stand how your vehicle works before you can try to fix them ! Everything on your vehicle is computer controlled > The ignition switch is a low voltage input to 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)
    Which when it get a input energizes a relay that turns thing's on .
    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 voltage, 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.
    You can not diagnose these type vehicle's like one's from back in the day !

  • Jeff Armer Dec 06, 2016

    Normal vehicle class 2 communications and module operations will not begin until the system power mode has been identified. Discrete wires from the ignition switch contacts are monitored by the power mode master (PMM) module in order to determine the correct power mode. The PMM communicates the system power mode to all class 2 modules on the class 2 serial data line. Refer to Body Control System Description and Operation to identify which module is the PMM and the applicable power mode look up table.

  • Jeff Armer Dec 06, 2016

    Is the under hood fuse box hot ? Have Power ? Do you know where the battery is ?
    Battery
    Under the rear seat right side

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2 Answers

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  • Buick Master
  • 11,467 Answers

Your saying a scan tool won't talk with the PCM/ECM engine computer ! Test for B+ voltage at pin 16 of the DLC (the place you plug in the scan tool ) Is there B+ voltage ? No power forward of windshield ? No head lamps , turn signals etc... or just the engine has no power . Do you know there is a fuse box under the rear seat ? ALDL 10 amp fuse supplies B+ voltage to pin 16 DLC . There is no power at any part of the under hood fuse box ? Or is it when you turn the key to start nothing happens ? Are you aware of the complexity of the electronic's on your vehicle ? Every part of your vehicle is computer controlled .
Data Link Communications Description and Operation
Data Link Connector (DLC)
The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following:
• Scan tool power battery positive voltage at terminal 16.
• Scan tool power ground at terminal 4.
• Common signal ground at terminal 5.
• Class 2 signal at terminal 2.
Class 2 Serial Data Link
The data link is configured as a ring with discrete lines entering and leaving each module. This allows communications to the modules on the ring if one of the two discrete circuits is open.
A total list of the control modules on the Class 2 Serial Data Line can include the following:
• Dash Integration Module (DIM)
• Driver Door Module (DDM)
• Electronic Brake Control Module (EBCM)
• Head Up Display (HUD) w/UV6
• HVAC Control Module w/C67
• Inflatable Restraint Sensing and Diagnostic Module (SDM)
• Instrument Panel Cluster (IPC)
• Instrument Panel Integration Module (IPM) w/CJ2
• Memory Seat Module (MSM) w/A45
• Powertrain Control Module (PCM)
• Radio
• Rear Integration Module (RIM)
• Remote Control Door Lock Receiver (RCDLR)
• Remote Playback Device - CD Changer w/U1S
• Theft Deterrent Control Module
• Vehicle Interface Unit (VIU) w/UE1
DTC C1242 or C1243 is for the anti-lock brakes .
When you turn the key to the run position does the check engine light lite ?

Posted on Dec 06, 2016

Testimonial: "no head lamps, no nothing? I replaced the abs module, and needed to reset it, and tried, several times...and C1242 pump motor circuit open. then scanner went blank. I later found out auto part store sold me wrong scanning tool and would not work on ABS systems. I also did test for a short, using power tester, unhooking positive on battery and then using tester to battery and unhooked cable and it lit up. every fuse has been checked."

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  • Buick Master
  • 2,268 Answers

I think I may have the answer for you!
When cars are assembled at the factory, they start off with the metal body, already painted.
One of the first steps is to add the various wiring harnesses.
(Your car likely has about a total of 15 or 20 separate harnesses.) There is a main one that goes from the firewall below the windshield to the front of the car, it is plugged in to another one that goes from the firewall to the fuse box/circuit breaker box under the dashboard.
I suspect you car to have been in a serious collision that caused the plug to come loose from it's socket in the firewall. Or, a body shop could have removed and replaced that harness if the wires were smashed or broken in a fender bender.
Anyway, suspect a loose plug or two where the harnesses attach at the firewall.
God bless your efforts.

Posted on Dec 06, 2016

Testimonial: "never in accident. ere is an open circuit somewhere.anning tool shows blank"

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