parasitic Draw
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Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Year make and model? And it is the key switch on the driver's door worn out.
CF Veteran




Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Does the 1990 have the security system with the flashing light on top of the dash? I would check but I'll just ask you instead.
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CF Veteran




Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
If you have the security system, which I think you do, the body control module goes through a series of 'shut down steps'. If the key switch is worn out on either front door, or both as was the case in mine, the alarm won't set like it's supposed to. The BCM starts out at about 100ma, then cuts down to 40ish, then finally after about 40 seconds goes to 12ma or so. If those switches aren't telling the bcm that the lock is in the lock position, the bcm won't 'go to sleep' as described above because it thinks the door is being unlocked.
Also affected I think, is the rear glass switch, another frequent fail point
I'm talking about the small switch on the back of the key lock cylinders. Hope this applies.
Also affected I think, is the rear glass switch, another frequent fail point
I'm talking about the small switch on the back of the key lock cylinders. Hope this applies.
Last edited by 97grand4.0; Sep 27, 2016 at 08:15 AM.
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