Question about Cadillac DeVille
I have a 2002 Deville DTS which at first lost the turn signals, tachometer and speedometer. Now every other electrical component(ie feul, lights, power Windows, doors, as well as locks) all fail to work. The car turned over and everything worked for a second, then stopped again. Now the battery is drained, and won't hold charge. I'm at my wits end on this.
Do you know how to do automotive electrical testing ? Checking power and grounds . Hooking up a scan tool that can communicate with all the modules on the vehicle . The insturment cluster is a module too ,has a microprocessor inside . All the modules on the vehicle are connected through a serial data network . Class 2 . All it takes is one messed up module to short out the network an the vehicle will have all kind of electrical problems , like you won't believe . I see this all the time and the odds of you fixing this is probably not good . You have no idea of the complexity of these systems . So before you make the problem worst have the cadillac dealer check it out .
Body Control System Description and Operation
Table 1: 4-Wire Ignition Switch Table
The body control system consists of the following 3 modules:
• The Dash Integration Module (DIM)
• The Instrument Panel 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 module is connected to the Class 2 serial data circuit, many of the control functions are implemented by Class 2 messages.
Dash Integration Module (DIM)
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:
• Class 2 communication requiring DIM interaction.
• Control of exterior lamps.
• Control of front fog lights.
• Control of the headlights.
• Headlamps on with wiper input.
• Hood ajar switch input w/export.
• Horn relay control.
• Interior lamps incandescent dimming.
• Low side temperature for HVAC compressor.
• Power moding control over Class 2 serial data circuit.
• Reverse lockout solenoid control.
• Steering wheel controls input.
• 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
Posted on Aug 13, 2017
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Posted on Jan 02, 2017
SOURCE: electrical problem
Turn off the car and pull out the key.
Check the alternator leads and the battery leads if they don't touch any other leads around them.(or each other-short circuit-as for the alternator)
Is the battery charged? It might have even died, partially, thus providing enough power only to the small consumers. In that case the engine wouldn't start- does yours?
Check the fuses, but this might be a serious problem, so replacing the fuses can't be considered a long time solution itself...(if they were burnt)
Can you fire up the engine?
Do the Gauges work right? And the dashboard lights(except those you already mentioned)?
However if you are not really familiar with all this, I'd suggest you to have it done by a car electrician, he could have it finished by tomorrow evening...
answer the questions for further info if you are unsure
and rate please
Posted on Apr 16, 2009
The immobilizer has come on you need to diss arm it or bypass it.This some times happens when the battery is left flat for long periods of time.
Posted on Jun 05, 2009
SOUNDS LIKE YOU HAVE BROKEN WIRES BETWEEN DRIVER'S DOOR AND BODY AT A PILLAR..PULL RUBBER BOOT FROM BODY AND DOOR AND INSPECT WIRING HERE
Posted on Jun 21, 2009
using a test light with all doors closed everything in the car off; disconnect your black battery cable then: connect a test light between the battery post you just removed the cable from and the cable you removed; the light should light. this is your short (leak) then remove fuses until you find the fuse that causes the light to go off your problem is in that circuit.
Posted on Nov 20, 2009
Mine just started doing the exact same thing tonight. I disconnected the battery to change a DPFE sensor and when I reconnected I had this problem. I also have auto headlamps and they are not working either. I don't know what is wrong, I checked all the fuses also and everything looks good. I wonder if it is a relay??? I will make sure I respond to you if I find a solution.
Posted on May 06, 2010
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