GMC Safari - Popular Questions, Answers, Tips & Manuals

Question edited for a lot more clarity. Question moved to model category. This says it doesn't have one. https://www.justanswer.com/gm/4n355-crank-position-sensor-located-95-gmc-safari-4-3.html https://www.google.com/search?q=1994+GMC+Safari.+Crankshaft+Position+Sensor+location ..

Check the neutral safety switch.

Hello. It seems the 'voltage drop' can be due to a 'worn' multi-function switch. It's possible a windshield wiper motor relay is at fault. Good luck and keep me informed; if you want to.

go to starter check the red wire with test light make sure you have 12 volts and then check the purple wire to the solenoid and hve someone turn key to crank should have power at that wire when in crank if not check the relay and theres a 10ap crank fuse

Check the sockets for power and ground with a volt meter

Do you hear fuel pump coming on ?

Info in the link and in general in the videos https://www.google.com/search?q=1991+GMC+Safari.+compression+test

When googling... don't be so specific.
Just try something like this...

gmc/ Chevy wiring 2003. Most sites will have breakdowns...ie.. lights...stereos.. speakers..etc. most years are close or compatible as well. Like 2000- 2005 will be almost identical.

the lost now glove box user guide on all cars cover all that. so if lost get it google finds them all so do so some are even free. if you googled. 1993 is paper only guide. one is under hood one is under dash see page 306, here, the photos are crude scans of 30 year old old booklet so be happy some poor dude scanned it. it is all there and can be downloaded free 100% free. and best place of all. https://www.manualslib.com/manual/231732/Gmc-1993-Safari.html?page=306#manual USA car one fuse box is just to the left of steering column at toes has huge black cover over it ,day1 new car. that simply pulls off and the fuse panels is there. under dash left USA LHD CARS

Is the engine turning over and not firing? Check the schrader valve on the fuel rail for pressure. Remove the air filter and spray starting fluid into the intake tube. Have a second person turn the engine over till it fires. If you have adequate spark to the cylinder and starting fluid reaching the cylinder, it will fire. Don’t over spray the cylinder.

The firing order is 1 6 5 4 3 2 for 4.3L engine.

https://www.autogenius.info/gmc-safari-mk2-2000-2003-fuse-box-diagram/ Hope it helps.

Found this info, hope it's correct. 4.3L engine.

Does the van have remote keyless entry (RKE) system ? Interior Lighting System Description Vehicles with the optional remote keyless entry (RKE) system have interior lighting controlled by the body control module (BCM). This vehicle uses a delayed interior lighting system. The system functions as follows: • The dome lamps will illuminate when any door is opened. • The dome lamps will remain on for 20 seconds after the last door is closed. • The delay is canceled and the dome lamps will go out when the ignition switch is turned to the ON position. • The illuminated entry function will not operate when the dome lamp defeat switch is in the OFF position. • The interior lighting system is protected from battery rundown by the retained accessory power (RAP) system. The RAP system functions by shutting down interior lights after 10 minutes (when ignition is OFF). Interior Lights Circuit Description When the interior lamps circuits are closed/enabled, the courtesy lamp relay is activated by the two following coil circuits: • CKT 690 (GRY/BLK) which is the courtesy lamp enable output of the body control module (BCM) driving the coil side of the relay. • CKT 1732 (ORN) which is the coil output side of the relay going to the potential grounding switches/sources. When the courtesy lamp relay is enabled, CKT 156 (WHT) (courtesy lamp output) is enabled by the closed contact at the relay and then grounded by CKT 750 (BLK) at G110. Some of these circuits can also be activated with the headlamp and panel dimmer switch. When this happens, the coil output side of the inadvertent power relay is grounded to the body control module (BCM) via CKT 1393 (DK BLU) CKT 40 (ORN) from the courtesy fuse drives both input sides of the inadvertent power relay. When the contact is pulled closed, CKT 1732 (ORN) is supplied power, thus driving any lamps/circuits attached that circuit and providing ground. The body control module (BCM) also monitors the following four door inputs: • CKT 49 (DK BLU) -- LH door jamb switch input • CKT 54 (ORN) -- RH door jamb switch input • CKT 775 (PNK) -- Side door jamb switch input • CKT 656 (YEL) -- Rear door jamb switch input/liftgate strut switch input (depending on option content) When the doors are closed, the body control module (BCM) is in a floating state of 0-2 volts. When the doors are opened, the courtesy lamp relay is activated, sending power to the courtesy lamps. The headlamp and panel dimmer switch also activates the following interior courtesy lamps when the switch is placed in the PARK or HEADLAMP ON positions: • RF power window switch • RH power door lock switch • LH power window switch • LH power door lock switch • LH outside rearview mirror control switch • Rear radio control head The dome lamps can be disabled by closing the dome lamp defeat switch located on the headlamp and panel dimmer switch. -------------------------------------------------------------------------------- Courtesy or Dome Lamps Inoperative Step Action Value(s) Yes No Important: Verify functional bulbs before beginning diagnostic procedure. 1 Did you perform the Lighting Diagnostic System Check? -- YES - Go to Step 2 NO - Go to Diagnostic System Check - Lighting Systems 2 Are all of the courtesy/dome lamps inoperative? -- YES - Go to Step 6 NO - Go to Step 3 3 Activate courtesy/dome lamps With DMM, check for battery voltage from inoperative lamp CKT 1732 (ORN) to ground Is battery voltage present? B+ YES - Go to Step 4 NO - Go to Step 5 4 Repair open in CKT 156 (WHT) between inoperative lamp assemply and S214. Is the repair complete? -- NO - Go to Step 10 -- 5 Repair open in CKT 1732 (ORN) between inoperative lamp assemply and one of the following splices: • S258 • S301 Is the repair complete? -- Go to Step 10 -- 6 Turn the courtesy lamp switch to the ON position Check for battery voltage at BCM C2 cavity B12. Is battery voltage present? B+ Go to Step 7 Go to Diagnostic System Check - Body Control System in Body Control Systems 7 Verify continuity of the following three circuits with DMM: • CKT 1732 (ORN) between courtesy lamp relay and body control module • CKT 156 (WHT) between courtesy lamp relay and S214 • CKT 750 (BLK) between courtesy lamp relay and S206 Are all of the circuits functional? -- Go to Step 8 Go to Step 9 8 Replace courtesy lamp relay. Is repair complete? -- Go to Step 10 -- 9 Repair the inoperative circuit. Is the repair complete? -- Go to Step 10 -- 10 Operate the system in order to verify the repair. Did you correct the condition? -- System OK Go to Step 2

Usually it's the oil cooler lines.

Try putting a little fuel in the carb, if it fires up and starts it will be the float in the carb float chamber has got stuck, easy to strip and clean, be up and running well within an hour ;)

Sometimes when battery voltage is lost, some modules may have to be reprogrammed or relearn? Do you have a security system? You could always check the basics, have a helper crank it while you check for spark at the plugs. Also, check proper fuel pressure and fuel injector pulse. Let us know what you find?

If I see your problem correctly. The engine starts but won't run but it runs with a remote control. If this is your problem then I will check with a test light at the connector under the dash on the column steering if there is + on the run ignition switch position. Meaning 1. Unplug anything to make the engine to won't starts the engine(security) 2. Turn the ignition switch to start or run back and forth then backprobe terminals at the column steering to see if you have + switching between the on position and the run position. if not find out the IGNITION SWITCH assembly or WIRES problems or terminals (no contact) at the connector.(Not the ignition solenoid like you say) Hope it helps.

you have a plugged radiator or heater line to back heater unit not allowing coolant to flow

If ignition and spark seem to be ok, it's time to look at your fuel system. When you say "turns off", if all electrical power seems OK, check the fuel pressure for faulty pump, plugged filter or faulty regulator.