Question about 1999 Jeep Grand Cherokee

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1990 grand wagoner fog lights have no power. looking for wiring manual how does the 4wd switch activate the drivel axle? (have some rubber lines that are cut and go to where? cruise control vacuum lines missing any help will be welcome

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Yes if the vacuum lines are cut missing and dry-rotted they need to be in place and you should obtain a schematic or compare it to one of the same style as a guide to what goes where

Posted on Sep 06, 2009

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1998 dodge 4x4 activator vacum switch where is it located

The activator switch that engages the front axle is located on top of the axle on the right side of the Axle it will have 2 vacuum lines that plug into it usually they are red

Mar 23, 2014 | 1998 Dodge Ram 1500 4WD

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I have Nissan TIIDA latio 2007 e-4wd. I installed fog lights with pre wired availability. Now tell me how i connect the switch for fog lights

Run a ground wire from the lights to a good ground on the frame. I usually look for an available wire connection near the battery, sometimes the factory will have extra wires going from the battery not hooked to anything. Other wise, check at the alternator, a wire may be exposed there. Make sure there is a fuse in your new wiring, and run that wire to the switch for the new lights, and then from the switch run a wire to the lights.

Dec 01, 2013 | Nissan Cars & Trucks

1 Answer

Suzuki grand vitara 2003 4wd light keeps coming on and off while driving in 2wd and makes clunking noise

ok its not fibbing, the 4wd is engaging while it should not.

the answer is in the book. the FSM
and at alldata dot com.
as a rule with suz, cars, is that early years.
the light is before the fact and later years after the fact.
but dont matter here, due to its in 4wd.
and will windup on pavement (are you on that or dirt.?)
do not drive a car with stuck 4wd (part time 4wd is not AWD)
its a danger to you and all others on the road.

On my GV. it works like this, and 04, , I have all the books on muy car, so i can DIY . at any time.
fixing cars is complex an wiring blind is dangerous to you and the drive line.

volume1 chapter 3B3.
the ECU sees 4wd and glows the light .
the ECU gets this fact from the 4wd small air pump.
this year, uses a front axle module
this model is an air pump
this #2 module has and air presure switch
so bingo lamp on means the air pump is running. (maybe)

so either that air switch is fibbing, its not you feel 4wd engaged.
or the 4wd command switch is stuck closed. bingo.
this switch closes (or breaks) and tells ECU to engage
4wd, the ECU then starts the air pump then the pump runs
and the air pressure acutaly (vac actuators) move the front
axle to 4wd axle lock mode.

that is the whole deal.
a volt meter at the switch, teminal to ground read
black-org wire
12v ,not 4wd.
0v , engage 4wd, (move the lever key on, and see it toggle.
0v, 12v, 0v ,12v, the sure sign of a good switch.

Sep 25, 2013 | 2003 Suzuki Grand Vitara

1 Answer

How to install fog lights

To do it right you will need several things. Go to and register your vehicle to get a free wiring diagram and fusebox diagram.

This will help you wire the Fog lights. Here is how you plan this. You will need a light Relay to go inline between the lights and the Power supply. Get a Relay which needs a trigger wire to activate and fuse the power line going to the Relay.

This means that the Relay only needs power from the trigger wire to activate the connection between the power and the lights.

Then you need to pass the trigger wire through the Firewall(Cabin) in a manner that will not chaff the wire. This wire should be fused too! You can try to use an unused position in the Fusebox or inline fuse.

The power for this trigger wire should be controlled by the Ignition switch

This means that it will only have power when the Ignition is on. You do not want it to receive power when the Ignition is in ACC or OFF.

Wiring it in this sequence will prevent you from leaving the Fog lights burning without having the Ignition switch in the RUN position. Doing it this way will also let you leave the Fog lights switched ON between uses so you need not bother to turn the Fog lights off/on each time you get in your car.

Each power wire is protected by a fuse so if something shorts on one side of the Relay, the other end of the Relay may be unharmed.

Then it is just a matter of chosing the switch, lighted will indicate if the Fog lights are on, but not necessary to the basic operation of the switch. Then chose wisely for where you drill a mounting hole. Sometimes it is good to chose a panel that can be replaced if you change your mind about its' location.

Please rate my solution.

Oct 21, 2012 | 2011 Chevrolet Cruze

1 Answer

I can not get power to the motor to engage my front axle on my 4x4.

Power as in 12 V DC ? if yes, you are not in the correct area, the front axle is locked in and out of 4x4 mode with vacuum.

Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
Item #10 in this diagram
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.

- If the front drive shaft turns:
For ESOF system
-- Check the fuses for the transfer case, engine compartment fuse panel, 17 & Cab fuse panel fuses 13 and 23 ( verify with owners manual, 97-97 & 99-03 MY can be slightly different on some items ).
-- Try hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ) to see if the transfer case shift motor is hung up .
-- Check the transfer case connector, to make sure the connector pins are clean and making good contact.
For MSOF systems
-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

Jul 30, 2011 | 2000 Ford F150 Flareside SuperCab

1 Answer

1990 toyota 4cly 4x4 pickup need to know where fuel pump relay switch is. I don't have the manual. No power to pump. I ran another set of wires to pump with relay switch for now until I can figure out...

my 1990 toyota 4wd manual tranny wont go into 4wd.
the 4wd light does not come on but the vehicle feels like it is in 4wd, is there a electrical switch that controls this issue ie; the hubs don't lock in.

Mar 20, 2010 | Toyota Pickup Cars & Trucks

1 Answer

The 4x4 will not work. No service light is on. I replaced the switch still nothing but i did find a hose with big holes missin and it leads to the transfer case. Cound that be the reason it doesnt switch?

The hose sounds like the 4WD vacuum switch line hose that connects to the vacuum switch on top of the transfer-case on the driver's side. When the vacuum switch is activated, it actives the 4WD actuator under the battery to lock up the front axle hub in the differential giving you 4WD mode.
Inspect the vacuum hoses and replace and damaged parts and reconnect the vacuum line to the vacuum switch. This should get your 4WD running 100% again.
Thank you for using Fixya and good luck, if the switch is faulty. You can pick one up at Auto Zone, Napa for around $25.00 and can be replaced in about 20 min with common tools.

Mar 18, 2010 | 2001 Chevrolet Blazer

1 Answer

4 wd will not engage ,indicator lights on dash do not light

If its not engaging into 4 WD the vaccum actulator is more than likely stuck. The actulator is located on the front of the axle next to the the front gear hub it will have a plastic cover over it. Unbolt the two 10mm bolts that hold the cover on and spray down with WD-40, also pull back the rubber cover thats on the actulator staff and spray it. You might have to hit the staff a few times to get it to move just make sure its in 4WD. I had the same problem, that part is exposed to alot of water, snow, salt and so on. Or you could just replace it but its cheaper to spray it down with WD-40

Apr 18, 2009 | 1999 Ford F150 Regular Cab

2 Answers

95 tahoe four wheel drive stopped working/shift light not working

I have a 1996 tahoe that did the same thing to me.

There is no vacuum lines, it is all electric. The motor on the front differental is controled by the actuator switch on the top of the trans case. The motor is controled by 3 wires. 1 is a ground and the other 2 are signal wires. When the truck is in 2wd, the motor will get 12volts to ground on 1 wire all the time to turn the motor out. When you put it in 4wd, the motor will get 12 volts to ground on both signal wire to turn the motor in.

Here is the point!! Check to make sure that none of those wires from the t-case switch to the motor are shorting out on something metal. In my case those wires came out of the wire loom(black tube) and rubed the insulation off. shorting on the t-case.

If your truck ever gets stuck in 4wd, were you have to keep it in 4wd or the front end makes a hell of a noise, the actuator switch on the t-case is none to go out. cheap fix. If that ever happens and you are in a pinch. Unscrew the motor out of the front end and manualy give the motor the signals that it needs with jumper wires and the trucks battery to turn the motor out, screw the motor back in. Don't put the wires back on till you can fix it right.

Feb 07, 2009 | 1996 Chevrolet Tahoe

1 Answer

Hello, my name is David Cooper, I am in Haiti with Gospel to Haiti Mission. I am 5 hr NE of Port Au Prince. The differential lock on the 1998 "troopie" is not operating consistantly. The switch is working,...

Please explain your situation slightly better. Are you saying that the vehicle is not in 4wd?
Also, when you mention the Differential Lock, I do not understand what you are expecting it to do when activated...The differential lock does not apply more "4WD", it just makes all 4 wheels turn at the same RPM...for maximum traction. I'd really like to help you, but I need more information. Please be advised that there may be an issue with you seeing my comments after you read this post. So, if you do not see anything from me, please send me a direct ask. Thanks, and please comment back.

Nov 22, 2008 | 1998 Toyota Land Cruiser

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