My 2004 s type 3.0keeps flashing dsc not available cruise control not available abs not working turn ignition off they go out but come back on after 5 mins also speedo and petrol data stopped

Crank & cam sensors would not have anything to do with it . Now if the vehicle didn't run (no spark or fuel injector pulse ) sure. The vehicle does start an run , Right ?
What engine does it have ?
Cruise Control Description and Operation (4.2L)
Cruise Control Description and Operation (5.3L)

Your vehicle has electronic throttle control (drive by wire ) do you know what this is. Complex electronic's invloved . The cruise control switches are located on the multifunction/turn signal lever.
The powertrain control module (PCM) monitors the signal circuits of the cruise control switches in order to determine when to capture and maintain the selected vehicle speed. The PCM uses the throttle actuator control (TAC) module motor in order to control the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.2 L.

The PCM will engage and adjust vehicle speed based on the information received from the TAC module via the UART serial data link. For further information on the TAC system, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.8L, 5.3L, and 6.0L.

Your best bet , take your vehicle to a qualified repair shop that has the knowledge an diagnostic scanner to trouble shoot your problem .
Complex electronic's involved .definitely need a factory or professional type scan tool .

Your turn signal's & hazards problem is probably the smart flasher ,(GMSF) is an automotive flasher designed to accept turn, hazard,
GM Turn Signal Problem Fix Directional Relay Replacement

diagnose and repair ABS system

Strange electrical problems can sometimes be attributed to a bad ignition switch. The battery should also be load tested, especially if it is more than 4 - 5 years old.

Sounds like a bad connection for one of the fuses or relays, yes.

There should be at least 5 abs sensors:
One for low brake fluid------- check master cylinder for low fluid, if it is low( use dot 3 brake fluid ) to fill it.
The other 4 on the back side of each wheel called wheel speed sensors ( which are tied in with abs system).
To really pinpoint the problem, an abs code scanner should be hooked up to it, that would tell what is causing the light to come on.
I think advanced auto parts store or auto zone check it for free (if there is one near you) otherwise some places charge $80.00 to $100.00 for 30 seconds just to retrieve the code.
As far as the cruise control, it could be a vacuum problem or accuator problem, etc. Without testing it's hard to say.

really tough to do on the net but first we need to know about any codes...

Hold speed control OFF button, and turn ignition switch to RUN position. CRUISE indicator should flash once to indicate successful entry into self-diagnostic mode. If CRUISE indicator does not flash, start procedure over. If CRUISE indicator still does not flash, repair system by symptom there might be some switch concern

If CRUISE CONTROL indicator flashes once followed by 5 additional flashes, replace speed control servo/actuator.

Release speed control OFF button. Within 5 seconds in entering self-diagnostics, press speed control ON button. Press remaining speed control buttons in the following sequence; ON, RES, COAST and SET/ACCEL.

As each button is pressed, CRUISE indicator will flash.

Wait until indicator light goes out, then press next button. After sequence has been completed, indicator light will flash to indicate test passed or failed. With the codes we can then better diagnose your concern

Immediately after static test has passed, actuator performs a dynamic test by automatically operating throttle .04-.40" (1-10 mm). Observe throttle movement to witness any sticking in cable or linkage. Ensure throttle returns properly. Turn ignition switch to LOCK position. If self-diagnostics do not pinpoint fault there is more we can do but tough over the net

abs light on also? mileage read out? abs modules are very common, i had three of em in a month last spring.... jaguar all were on back order.....
one thing i would try...remove the abs connector at the module and apply stabalant 22 to the conector pins and to the female side as well.... reconnect and and un hook battery while performing and module connector removing, it did work on one of the ones i had

turn the ignition switch to the ON position 3 times. On 3rd turn, leave the switch in ON position. Watch the Check Engine light. If a diagnostic trouble code is present, the CHECK ENGINE light will flash if it doesnt flash then speed sensor relay went bad its located in the junction box.

I would check the ABS sensors on both sides. Those are wires that fit on all wheels to give signal to the ECU for proper functioning of the car. They might just put back the old ones for you . and they should have ben replaces

There is a switch underneath that goes out due to the debris underneath. Either take it to the shop or deal with the lights comming on.