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I don't know what a TDM is. Are you talking about a TTM? Here are some things that I do have in my reference list:

SDM Sensing and diagnotic module (air bags)

TTM Tilt and Telescopic Steering Wheel Module

DDM Drivers Door Module

PDM Passenger Door Module

If none of these is what you are thinking of, please tell more about the TDM, and why you want to by-pass it.

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-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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I think its the Henway

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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theft deturent modual............... the motor cranks and has spark but the injectors wont fire, there is fuel pressure, and the display reads a falt with the security system....... bypassing the passlock with the resiter did not work.

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I have this

VTD Vehicle Theft Deterrent

but I don't have the theft deterrent as a separate module. I believe that this is contained inside the IPM. It takes data from the body module (PZM) and controls the PCM over the data network in the car.

If you have a message on the dashboard that says "PASSKEY INCORRECT, STARTING DELAYED" with a count-down of three minues, then it's the resistor in the key and you will have a code, something like

PZM B2782 CURRENT

This is usually one of

B2710 PASSKey Open/Shorted Pellet

B2782 PASSKey Pellet Resistance Not Programmed

You will be able to start the car when the countdown completes. You can take the old key to a dealer or a locksmith (cheaper than a dealer!) and get a new key made that will work.

If that's not what is happening, read the OBD II codes and post them and we can likely tell you exactly what's wrong and how to fix it. Here's how:

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Your Cadillac has an ON BOARD diagnostic system, you do not need a reader. Go to the top of this page, click HOW TO, then DTC CODES and read the section on your year (1996) that details how to retrieve your DTC codes.

Most readers ONLY read "P" or powertrain codes, your ON BOARD diagnostic system will give you codes for EVERY system, you probably have codes set and do not know it

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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here is what i got; IP1552 IP2750 TC0073 TC0083 AND PZ2550

B2750 - PASSKey Data Communication Failure

B1552 - Keep Alive Memory (KAM) Error

I cant find the TC's but I think they are related to traction control, someone may know what they are, I tihnk the PZ2550 is related to the key fob

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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IPC Instrument panel computer

TCS Traction control system

PZM Platform zone module

B1552 Keep Alive Memory (KAM) Error

B2750 PASSKey Data Communication Failure

B0073 Supplemental Deployment Loop #1 Resistance Low

B2550 Storage Mode Entered (Backup Lamps Control Circuit)

Next time get the codes after you drive the car and park, but before you turn of the key, and write down which codes are HISTORY and which are CURRENT. That's important because CURRENT codes were set by a test done since the key was turned on, and likely indicate that there is something that needs to be fixed. HISTORY codes can be weeks old and may not mean anything.

The IPC is the main computer that drives the driver information center (DIC) and the warning lights, and it is the one that the OBD code reader interface goes to. The PZM is the module that makes the body work -- trunk lid lights and latch, key fob, electric door locks, electric windows, etc. In some Devillles the doors have their own modules, and the memory seats and memory mirrors have their own modules.

The B1552 is set when you disconnect the battery and goes away about three months later. The B0073 is an air bag code; apparently a wire is shorted. The B2550 is an indication that the car sat without being driven for an extended period not to far back.

The B2750 tells us what your problem is. Clean the resistor pellet connections on your key and clear the codes, then see if it comes back. Here's how to clear the codes (see the HowTo section if there seems to be some differences between the buttons):

The buttons that operate the IPC are on the A/C controls. You go into the diagnostic mode by pressing OFF and PASSENGER WARMER buttons simultaneously and holding for several seconds. When all the dash lights come on, you can release these buttons. You exit the diagnostic mode at any time by pressing INFO RESET.

The car's computers will cycle through all the main modules requesting codes. Each code will be displayed in the format MMM Lnnnn {HISTORY or CURRENT}, where MMM is a three-letter module acronym, L is one of P, B, C or U, nnnn is a four-digit number, and finally an indication of whether the code is History or Current.

When this is complete, you will have a prompt "PCM?" Now your buttons are the FAN UP and FAN DOWN controls. UP means Yes and DOWN means No.

The "PCM?" prompt is for working wth the PCM; Press Yes to see the options one at a time or press No to go to the next module. To clear the codes for a module, press Yes for the prompt for that module, then press No until you see "Clear Codes?" then press Yes. Then you must exit the diagnostic mode by pressing Clear Info to get to another module. When the codes start to display, you can press No to skip them and go straight to the module prompts, then scroll through them to the one where you want to clear the codes.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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T073 PCM - EBTCM/EBCM Pulse Width Modulation Signal Fault

T083 Brake Fluid Level Low

The Electronic Brake and TCS is the EBTCM/EBCM. I would check the brake fluid and clear the codes. The T073 probably isn't a problem unless it's CURRENT.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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The TC's are OBDI codes.

thanks for that info Ranger

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The factory shop manuals do indeed have complete wiring diagrams.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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  • 4 weeks later...
  • 6 years later...

Well guys its 2016 I have the 1990 Cadillac Fleetwood FWD (not the Bromham). I am also looking for the TDM (theft deterrent module) I had purchased a Newrockies Pro which is a module which overrides the entire pass key system of the vehicle.

Anyone have any idea where this may be located? It not underneath any part of the dash and its not in the trunk. If anyone knows where this box may be found please let me know I would very much appreciate it. I have looked high and low and nothing. The only thing I can think of is if its part of the BCM (body control Module).

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