Question about 1996 Jeep Grand Cherokee

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Car wont start all lights/radio come on as normal

I've been having trouble with central locking so don't know if problem related, the drivers door doesn't always open/lock with fob so use the key. I stopped to run into a local shop didn't lock or open so used key to do both, got back in car and all lights/radio came on but the car wouldn't start, it wasn't making a noise(as if it was trying to fireup) as if immoiliser is still on. used fob several times to lock/unlock to see if corrected problem but nothing happened.

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  • Maria Louise Connolly
    Maria Louise Connolly Feb 27, 2009

    That's not the problem but thanx anyway.



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If its trying to start the fuel pump can be the issue they are known for this turn off the radio and listen for a vibrating noise and see if the fuel pump is coming on

Posted on Feb 27, 2009


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I have a 2002 ford f150 supercrew lariat, my power door lock on all 4 doors dont work and neither switch works, theres is no clicking sound or anything, but the lights on the switch light up, also the...

You can't figure out thing's without knowing how there work , what controls them . In this case a control module .
Principles of Operation

Power Door Locks
The central security module controls the power door lock and keyless entry system. The lock and unlock operation is carried out by supplying ground to the central security module from the door lock control switch. The normal path of the actuators is to ground through the central security module. The door lock control switch will lock and unlock all doors by grounding the appropriate circuit to the central security module. The central security module then supplies power to the appropriate common actuator circuit to lock or unlock all doors.
Plus we don't guess , we test the electrical circuits with a DVOM - digital multimeter or a test light . We use a wiring diagram so we know which part of the circuits to test .

Keyless Entry
The remote transmitter sends a frequency that is received by the central security module internal antenna. Depending on the frequency received, the central security module will lock all doors or unlock the driver door. If the unlock frequency is received again within five seconds of the first unlock, the central security module will unlock all doors.
If the frequency received is for the panic button, the central security module will cycle ground to the park lamp and horn. The park lamps and horn will continue to cycle until the panic button is pressed again or the ignition switch is turned to the RUN position or 2.75 minutes elapse.
Plus we hook up a scan tool that can read codes from the control module , not a code reader for engine codes , won't work ! Need a professional scan tool .Do you know what DTC'S are ? Diagnostic trouble codes !
Central Security Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action to Take B1309 Power Door Lock Circuit Short to Ground Central Security Module Go To Pinpoint Test C . B1341 Power Door Unlock Circuit Short to Ground Central Security Module Go To Pinpoint Test C . B1485 Brake Pedal Input Circuit Short to Battery Central Security Module Go To Pinpoint Test E . B1526 Keyless Entry Circuit Short to Ground Central Security Module Go To Pinpoint Test F . B1629 PRNDL Reverse Input Short to Battery Central Security Module Go To Pinpoint Test E . B2276 Less Than Two Transmitters Programmed Central Security Module Go To Pinpoint Test I . B2425 Remote Keyless Entry Out of Synchronization Central Security Module Go To Pinpoint Test I . - All Other DTCs Central Security Module REFER to Section 419-10 .
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  • Battery junction box (BJB) fuse(s):
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  • Circuitry.
  • Central security module.
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Seams you lack the knowledge and test equipment to tackle this type of repair . Your best bet mite be to have a qualified repair shop check it out.
So, without testing i couldn't even begin to suggest what mite be wrong . I would only be guessing , as would anyone on here would.

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