Jeep Cars & Trucks - Recent Questions, Troubleshooting & Support

Oops! Should mention I have 2004 Jeep Grand Cherokee, not Liberty.

2004 Jeep Grand... | Answered 8 hours ago

it is a sentry key light. which is part of the anti theft device for the ignition for the jeep

2000 Jeep Grand... | Answered 22 hours ago

If it has a pretentioner and it's not plugged in find the wires and plug them in but you already know that, sometimes scanners can be wrong depending on the nfo loaded into it. Does the seatbelt light and buzzer work? If yes start looking at the crash sensors if equipped. I hope this helps. Take care.

Jeep Cars &... | Answered Yesterday

under the steering wheel

Jeep Cars &... | Answered Yesterday

The air bag system is not fused, if your light is on the system is disabled and will not deploy in an accident. Have it checked for fault codes

Jeep Cars &... | Answered 2 days ago

I have seen the water pump impeller go bad on a lot of jeep engines. Take off the top radiator hose and run the car. Run it long enough to have the thermostat open. Have a garden hose in the radiator inlet. See how much water flows through the hose.

Jeep Cars &... | Answered 2 days ago

More than likely there is a pencil that fell down the defrost vent blocking it.

Jeep Cars &... | Answered 2 days ago

When changing the fuel filter and air gets into the system, just turn the key on and off a couple of times and the air will be push out through the rail into the tank. There is no special way to get air out of fuel system in a gasoline engine. If it was a diesel you can crack open a fuel line by the injector and let the air out. Most diesels will have a bleed valve by the fuel filter.

2006 Jeep... | Answered 2 days ago

put in drive , dont give it any gas, when it starts to roll,put it in neutral, and try it then

Jeep Cars &... | Answered 2 days ago

I will post it in 2 different posts because its too long DB

Individually controlled driver and passenger side electrically heated front seats are available factoryinstalled optional equipment on this model, when it is also equipped with the power seat option. The heated seat system allows both the driver and the front seat passenger the option to select one of two seat heating ranges, Low or High, or to turn the individual seat heaters OFF using the heated seat switches located in the center lower bezel near the bottom of the instrument panel center stack. The heated seat switch circuit operates on ignition switched battery current supplied through a fuse in the junction block, only when the ignition switch is in the ON position.

The heated seat system consists of the following components
  • Heated seat elements
  • Heated seat sensors
  • Heated seat module (or memory heated seat module)
  • Heated seat switches.
The heated seat system also relies upon resources shared with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus network. The PCI data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability enhanced diagnostics, and allows the addition of many new feature capabilities. For diagnosis of these electronic modules or of the PCI data bus network, the use of a DRB scan tool and the proper Diagnostic Procedures are recommended.

The electronic modules that may affect heated seat system operation are as follows:
  • Body Control Module (BCM) - Refer to Body Control Module in Electronic Control Modules for more information.
  • Heated Seat Module (HSM) - Refer to Heated Seat Module in Electronic Control Modules for more information.
  • Memory Heated Seat Module (MHSM) - If the vehicle is equipped with the Memory System, refer to Memory Seat Module in Electronic Control Modules for more information.
Refer to Power Seats Premium I/III in the Contents of Wiring Diagrams for complete circuit diagrams. Following are general descriptions of the major components in the heated seat system.

The heated seat system will only operate when the ignition switch is in the ON position, and the surface temperature at the front seat heating element sensors is below the designed temperature set points of the system. The heated seat system will not operate in ambient temperatures greater than about 41 °C (105 °F) . The front seat heating elements and sensors are hard wired to the Heated Seat Module (HSM) or the Memory Heated Seat Module (MHSM).

The heated seat switches are hard wired to the Body Control Module (BCM). The BCM monitors the heated seat switch inputs, then sends heated seat switch status messages to the HSM or MHSM over the Programmable Communications Interface (PCI) data bus. The HSM or MHSM contains the control logic for the heated seat system. The HSM or MHSM responds to the heated seat switch status messages, ignition switch status messages, and the front seat heating element sensor inputs by controlling the output to the front seat heating elements through integral solid-state relays.

When a seat heater is turned ON, the sensor located on the seat cushion electric heater element provides the HSM or MHSM with an input indicating the surface temperature of the seat cushion. If the surface temperature input is below the temperature set point for the selected Low or High heated seat switch position, the HSM or MHSM energizes the integral solid-state relay, which supplies battery current to the heating elements in the seat cushion and back. When the sensor input indicates the correct temperature set point has been achieved, the HSM or MHSM de-energizes the solid-state relay. The HSM or MHSM will continue to cycle the solid-state relay as needed to maintain the temperature set point.

The HSM or MHSM and the seat heater elements operate on non-switched battery current supplied through the power seat circuit breaker in the junction block. However, the HSM or MHSM will automatically turn OFF the heating elements if it detects an open or short in the sensor circuit, a short or open in the heating element circuit causing an excessive current draw, or when the ignition switch is turned to the OFF position.

See the owner's manual in the vehicle glove box for more information on the features, use and operation of the heated seat system.


2002 Jeep Grand... | Answered 2 days ago

dead fob chirp
dead alarm sound
dead horn button or all 3? must we guess?

double posted and still no clear symptoms
last post said only broken word, then now not working.
is horn dead? I push the horn button and my horn is silent.?
If you scan the PCM with any scan tool there are 5 horn errors.
called DTCs'
we use this amazing device called a voltmeter to find bad horns.
but most folks today never hear of one... so.... ask guess'ers to guess.
that it it?
Dead horn 101: (generic)
check fuses first,scan pcm for errors, 2nd, after all it may know why?horn is bad.wiring to horn bad.bad horn relay (there is none ) "has electronic drivers "BCM bad./PCM (or MTIP)horn switch bad.horn connections in steering coil spring bad.
the car has 2 horns.
so both most likely not bad.
the horn operates via 2 computer brains
1: pcm
THE TIPM ACUTALLY honks the horn,
the pcm sees you push the button(digital inputs)
and the PCM then sends a can-buss communication to the
TIPM brain under hood. (aka, MTIP)
the TIPM then honks the 2 horns.
Module totally integrated power , drives the horns.

why not scan it first
or get car serviced.?????
if not, its hopeless. (sure check horn grounds for rust)
lacking tools
or lacking how not to get injured playing with AIR BAD parts.
RTM first, jeep FSM book , factory service manual and see page on horn and use the advice on page to not get hurt.

26144678-4dw03abheqagcnugpkxx10ue-1-0.jpga driver is magic electronic device that replaces relays
some call them electronic relays,
but can be just power transistors on the motherboard
of the MTIP, (non user replaceable inside)
cars are catching up to industry finally.

2007 Jeep... | Answered 3 days ago

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