No, neither worked. I've never locked the doors on this thing, never needed to. After a short investigation, I noticed a small red housing connected to what looks like the auto headlight sensor on the dash. Does this mean it has security? I locked it with the fob and opened the door from the inside and nothing happened. The red housing isn't blinking when I lock it with the fob either. Did I get the wrong pcm for this jeep?
if the pcm came off of a vehicle of the same year, engine and drive train, it should be correct
when you lock it with the fob the horn should chirp and the light flash. if not, the system is not arming. the bcm controls security. you probably have a door or hatch switch keeping it from arming. try locking and unlocking everything with the key.
in order to reset the PCM no run feature, the system must arm, then be disarmed and the no run feature will follow suit,
I really appreciate your help ZeeJay. Tried locking and unlocking everything with the key. When I lock with the fob everything locks but the drivers back door. I manually locked it first, then locked everything with the fob. No chirp or lights flash. The jeep was locked up tight though. The wife drove it to take groceries to her dad a few times before the old pcm started acting up and she always locks everything. She said she doesn't remember it chirping or flashing when she locked it even back then.
i'm not certain what's going on with yours. I can tell you that on mine, the drivers door lock motor is inop and I dont have a FOB. I can use the inside automatic lock on either door and then close the doors, and the system arms. horn doesnt chirp but the light flashes. I've set the stupid thing off more times than i'll admit by opening the drivers door because it armed without the door being locked.
Well crud, nada. I put the old pcm back in and tried the fob and still got no flash from the lights or horn and red light on dash still didn't blink. Panic button works fine, pulled the horn fuse and let it run till it timed out for the heck of it. Wonder if I put the reman pcm back in the original vehicle and used it's fob to disarm that would work? Grasping here. Even so, they cut the harness and left the connectors in the reman so I'd have to splice all those wires together again.
Also, how do I determine if my vehicle even has vtss? If the donor vehicle did and mine does not, could that be the cause of all of this? All three cylinder locks turn the overhead lights on when used with the key, so that tells me they are sending a signal.
Out of my 3 laredos, my 98 had aftermarket security, my wife's old 97 had factory security and my new 97 has no security. My wife accidentally set off the no start feature once because we didn't have a remote. Almost put in a new CPS before I realized what was happening, did the passenger door trick and it started right up.
1995 Cherokee(XJ)-Rolled it
1998 Grand Cherokee(ZJ)-Sold it
1997 Grand Cherokee(ZJ)-DD
I keep reading about grounding the purple wire with yellow tracer out of the drivers door, but I also see mixed reviews on doing this to the 96-98 models. I found this, don't know if it applies to my year or not but I tried it and got squat.
A diagnostics mode is available in the system to
verify operation of all monitored switches or circuits.
To enter diagnostics, cycle the ignition key to the
accessory position 3 times, leaving the key in this
Upon entering diagnostics, the headlamps, park
and tail lamps will begin flashing to verify their
operation. In addition, the horn will sound twice.
Returning the ignition to the OFF position will stop
the lamps from flashing while keeping the system in
While in diagnostics mode, a horn pulse should
occur at each of the following events indicating proper
Note that vehicles equipped with the Vehicle Theft
Security System are also equipped with Illuminated
Entry. When in diagnostic mode it is recommended
that the Illuminated Entry Relay be removed. Otherwise
it is necessary to wait for the 30 seconds delay
after each door opening or closure.
(1) Beginning with all doors closed, open then close
each door. The horn will sound when the door jamb
switch closes, and then again when the switch opens.
There must be a 1 second delay between closing and
opening the switch.
(2) Open, then close the hood. The horn will sound
when the hood is opened, and again when it is closed.
(3) Activate the power door locks in both the Lock
and Unlock directions. The horn will sound after each
Z VEHICLE THEFT SECURITY SYSTEM 8Q - 1
(4) Rotate the key in each door lock cylinder to the
unlock position. The horn will sound as the switch
closes, and again when it opens. There must be a 1
second delay between changing switch states, or the
horn will not sound.
(5) Cycle the key to the ignition RUN position. A
single horn pulse will indicate proper operation of the
ignition input. This also will take the module out of
the diagnostics mode.
(6) Activate the Remote Keyless Entry in both the
Lock and Unlock directions. The horn will sound after
For any of these tests, if the switch does not remain
open or closed for at least 1 second, the horn will only
The lack of a horn pulse, during any operation,
- a switch failure
- the lack of that input to the Vehicle Theft Security
- or a failure internal to the module.
Check for continuity at the switch. If this is good,
check for an open or shorted wire between the switch
and alarm module. Also, check if the Powertrain Control
Module (PCM) has been replaced recently. For
the first 20 engine starts with a new PCM, the Vehicle
Theft Security System will function normally
except it will not prevent the engine from running.
A PCM from a vehicle equipped with Vehicle
Theft Security System cannot be used in a vehicle
that is not equipped with Vehicle Theft
If the Security Lamp comes on after ignition
ON and stays on, the CCD bus communication
with the PCM has been lost.
Yes, after a little more research I see the wire ground trick will not work. So Monte, does your 97 without security still have the red led indicator on the dash? Mine has one but I've never seen it blinking. From what I've read, the vtss is mounted behind the glove box. I guess I need get back there and visually see if I have vtss, weird that it would have the indicator led and not be equipped with security though. I guess if my vehicle is not equipped with security and the donor pcm did, I'll never be able to reset it and need to start looking for another pcm. I guess having the vin run would also tell me if it is equipped with security. This is a bummer, I was pretty happy when it fired off..for 2 seconds anyway!
Dang 96-98's! Looks like my next step is to verify if I have security or not, because obviously the donor vehicle did. I've done everything I can think of to get that red indicator light to start flashing to no avail. You've been a big help ZeeJay, I appreciate it. I'll be back to bother you guys some more!