2001 Ram 2500 4x4 two door ext cab. Starter intermittent--replaced, no help. Now ABS, airbag & engine lites on, hvac fan inop, auto trans shifts seem delayed. Ignition switch or other circuitry?

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private sale or from a used car lot if from lot call and advise should have a limited warranty ---if private call and ask about non start --try to get vehicle scanned and check for any codes previous may have cleared codes to make sale --check fuses/relays -if have starter fluid give shot if starts check fuel pump -possible fuel filter-if pump good will need to check ignition system ,check for spark,and or certain sensors like the crank position sensor------- the following post is from caddyinfo forum Subject: Multiple Electrical System Malfunctions, Engine Will Not Start, Engine Will Not Shutdown, IP Gauges/Lighting Inoperative, Radio Inoperative, HVAC Display Erratic, Loss of Rear Door Functions (Inspect Both Rear Door Harnesses and Repair, if Necessary)
Models: 2005 Cadillac STS
Built Between and Including VIN Breakpoints 50112423 and 50133076
Attention: This inspection should be performed on all vehicles currently in your inventory prior to sale or delivery.
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Condition
Some customers may comment on one or more of the following conditions:
• Engine Will Not Start
• Engine Will Not Shutdown
• IP Gauges/Lighting Inoperative
• Radio Inoperative
• HVAC Display Erratic
• Loss of Rear Door Window/Lock Functions
These conditions may occur intermittently.
Cause
These conditions may be caused from the rear door wiring harness being misrouted causing the harness to contact the metal door bracket. This contact may cause a rub through to the wires enclosed in that harness.
Correction
Inspect both rear door wiring harnesses. Repair any damaged wires and reroute harness to correct location. Use the procedure listed below.
Make sure the ignition is off.
Remove both the rear door trim panels. Refer to the Side Rear Door Trim Panel Replacement procedure in the Doors sub-section of the Service Manual (SI Document ID #1465575).
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2005 STS electrical problem NO START

the problem is more than likly a vacuum leak. look under the hood on the emissions lable and find the vac line that goes to the HVAC system. if you se the leak there great otherwise unless you work in an auto shop like me what i have done is smoked a cig and blew in the line to find the leak. the smoke will escape where the leak is...

you to have scanned and check abs controller for fault codes..sounds like rear abs sensor mounted in rear diff

The blower fan fuse in a 30amp, light green in color. When the fan would not work, was there an abs light on or power windows or radio inop also?

The ABS control unit does need to be coded to the vehicle. After coding the control unit, an End-Belt run test must be performed. I know that you will also have transmission faults stored, because the Trans warning is set since the control unit has not been coded
and the control units communicate constantly during engine operation. The trans uses abs input for shift characteristics and helps with power reduction during evasive driving control. A dealer should be able to code and perform the end run test and usually charge about an 1hr fee. They will also need to quick delete other fault memories.

check the power wire at the starter selonid

It may be a faulty speedometer with a short inside, or a short on speedometer wirings or connector.

Whenever car vibration cause the wiring to short, there you lose speedometer and trans functionality.

You need to access the speedometer connector and wirings to
instrument panel to fix this.

I would have the transmission shop check out the transmission.
The transmission may have a soleniod issue.

Your speed sensor in your trans. needs to be checked out sounds like its not working or not getting a good signal until its generating enough power and speed to start until it reaches 30 MPH. Check that out sometimes it could just be some dirt on it. It all makes sense the ABS light is on because its not reading the speed of the tires, and the AOD light is on because It has no idea when to shift into overdrive without knowing how fast its going. I sure Hope that Helps You Out, And Thanks, Bear001