1993 Jeep Cherokee disablealarm

RANDYBRU

MEMBER
1993 JEEP CHEROKEE
6 CYL
4WD
AUTOMATIC
250,000 MILES

Car stalled and lights flash, relayin glovebox clicks. Engine starts andimmediatelyshuts down. This is a Grand Cherokee Limited w/ factory alarm. Happened in the past and I just disabled alarm by turning door lock on and off w/key but has no effect this time. I don't have the keyless remote but I believe that this only locks and unlocke doors. I've tried all locks )on and off) and pulled all alarm fuses and even removed the clicking relay in glovebox. Still, lights flash and start and immediate stop. Like someone is trying to steal the car.
Any Ideas? I can live without the alarm, it's just a work truck.
Randy

3 Replies

RACEFAN966

MECHANIC
5,029 POSTS

Ok sounds like you may have an alarm problem. Now the keyless entry does arm and disarm the system but not needed to do so, as it also done with the locking and unlocking of the door with the key. Now what I would like to do is have the system self test so follow these steps and this will let you know if the system is working as it should or if there is something wrong with it. I would print this off so you can have it with you to follow.
1) You will need to cycle the key between accessory and off three times on the third time leave in accessory position. Once the lights flash and the horn sounds twice then you have entered the self test mode.
2) Now turn the ignition off the lights will stop flashing but you are still in self test mode now with each step to follow you will hear the horn sound indicating that the step was done right. You need to wait one second between steps. Now here is what is to follow after you turn the key off.
3) Now you will need to open each door one at a time. So you open a door the horn sounds now wait one second then close it the horn will sound again now wait one second and then follow this procedure with each door including the rear hatch.
4) Now open and close the hood again waiting one second between the horn sound then closeing it and wait one second before the next step.
5)Now lock the doors horn should sound wait one second and then unlock the doors the horn should sound again. Now sense you don't have the keyless entry FOB the next step will need to be skipped.
6) Now turn the key to the run possition the horn should sound this indicates that it is reading the key correctly and take it out of self test mode. Now if it don't sound at any time then that circuit will need to be tested. Meaning if it don't sound when you open a door note which door it is etc. If everything checks out ok the PCM is most likely the problem as it controls all this. Let me know how it goes.