Just got a 99 c5 and there is a few things that need to be addressed
First the display on startup says shocks inoperative and maximum speed 80mph
Next neither wIndow will roll down and cant lock or unlock doors from driver side
I'm kinda Of a diy guy so I'd really like to fix these issues myself if possible

99 c5 black on black with 145k paid $8700

 

The car has the electronic shocks I'm assuming, with the **** on the console to adjust the ride. You can either find someone with a TechII to program them out or you can use resistors as simulators. Then, just replace the shocks. The C6Z06 shocks from GMPARTSHOUSE or the Bilstein sport shocks from wherever you can find them cheapest are both very good replacements for under $300.

The windows/locks are likely something in the controls on the drivers door. There is a control pad on the door panel and then a control module on the door. You'll have to pull it apart and troubleshoot the wiring to see if that's true. Actually, I would first pull out the door to body wiring bellows and pull out the wiring as much as you can and check for damaged wires there first.

Peter

 

$300 each or for all four on the shocks and on the windows and locks I was gonna first try swapping controls with a biddy and see if that fixes my issue

 

Never mind just looked them up

 

The VERY first thing that you need to do is to read the DTCs. If there are a TON of them,,, clear the ALL and see what DTCs come back and post those. Heres how to read your own DTCs:

READING YOUR Engine Diagnostic Trouble Codes (DTC)

This procedure should be carried out any time you experience a problem with your C5. Most inexpensive store bought aftermarket code readers will ONLY read power train DTC’s. Reading the DTC’s with the C5 built in code reader will allow you to read ALL the modules in the vehicle.

The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect)
3) Press and hold the OPTIONS button
4) While holding OPTIONS, press FUEL button four times within a 10 -second period.

Initially, the on-board diagnostics go into an Automatic Mode which will cycle through each module and shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each module. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.

There are two types of diagnostic codes, Current and History designated with a letter suffix, “C” or “H”. A current code indicates a malfunction is present in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes. More likely it's an indication of an intermittent malfunction.

Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.

Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except E/M. Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press RESET To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles. There are a few body module DTC’s that if set will prevent the module from operating properly. Once the DTC is cleared, the module will return to full function. This is not true for power train DTCs.

If you have never read and cleared your codes, there will probably be a lot of old history DTCs. It is recommended that you clear your codes and see if any come back during a driving cycle. Those are the ones that you need to concentrate on diagnosing.

Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5.

NOTE and a WARNING. You can read the DTCs while the engine is running. I pull mine up all the time while driving.
WARNING. Don’t become distracted while reading DTCs while your driving and cause an accident!!!!! Use common sense and drive safe.

These are some very good C5 Diagnostic Trouble Code (DTC) explanation web sites!!! They also explain how to read the DTCs

Here are some very good sites that explain what DTC mean:

http://www.gearchatter.com/viewtopic11755.php

http://www.obd-codes.com/trouble_cod...d-ii-codes.php

Make sure to include the H or C suffix when you post your DTCs!!


Post the DTCs and that will help us find the issues!

BC

 

Ok cleared the codes and these are the ones that stayed
Rtd-c1786hc
Rtd-c1787hc
Hvac-b0333hc. (car has no ac belt)
A0-cdcm. B2284h

Had a million others but got those cleared

 

is that a battery charger?

weak batteries cause a whole bunch of problems in these vehicles.

 

Yes but have put a new battery in and still same stuff

 

Do you have Real Time Dampening suspension (F-45)

The LDCM Code is a voltage DTC:

DTC B2284
Circuit Description
The LH Door Control Module (LDCM) has two main power feeds (high and low), and one main ground. The low power feed (battery 1) is used to provide power for the LDCM logic and internal driver operation. The high power feed (battery 2) is used to provide power for systems that draw higher amounts of current (motors, lights etc.). For most functions, the LDCM will operate properly when vehicle system voltage is between 9.0-16.0 volts. The LDCM also monitors the voltage level at battery 1 and battery 2 circuits and can determine if the voltage level received is out of range. If the voltage level is out of range in either circuit , then a malfunction is present and a DTC will set.

Conditions for Setting the DTC
The LDCM detects battery 1 voltage range under 9.0 volts or over 16.3 volts.
Condition must be present for 2 seconds.
Action Taken When the DTC Sets
Stores a history DTC B2284 in the LDCM memory.
This DTC can only be set as a history code even if the malfunction is current.
No driver warning message will be displayed for this DTC.
Conditions for Clearing the DTC
The LDCM detects battery 2 voltage range between 9.0-16.3 volts for longer than 2 seconds.
Use the IPC clearing DTCs feature.
Use a scan tool.
Step
Action
Value(s)
Yes
No

Schematic Reference: Door Control Module Schematics

1
Did you perform the Engine Electrical Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Engine Electrical

2
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe Battery 1 parameter in the LDCM data list.
Does the scan tool indicate that the Battery 1 parameter is within the specified range?
9.0-16.3 V
Go to Testing for Intermittent and Poor Connections in Wiring Systems
Go to Step 3

3
Test for a high resistance in the battery 1 positive voltage circuit of the LDCM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 6
Go to Step 4

4
Inspect for poor connections at the harness connector of the LDCM and the instrument panel electrical center. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 6
Go to Step 5

5
Replace the LDCM. Refer to Door Control Module Replacement .

Did you complete the replacement?
--
Go to Step 6
--

6
Use the scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
--
Go to Step 2
System OK



--------------------------------------------------------------------------------
Document ID# 725701
2001 Chevrolet/Geo Corvette

 

I didn't reference your codes, but it sounds to me like it could be a BCM issue. My 99 would intermittently lose control of door locks, windows, gauges would go haywire later on, radio would turn off, and I'd get the shocks INOP message.
If that's the problem it's about a $300 solution if you get a used BCM and get the dealer to program it. If you want to follow this as the problem just search for posts with my username and the whole story will be there. But then the codes should tell you whether it's the BCM or not.

Great deal you got on the car by the way.