Check gauges and airbag light at start

chuck47

TJ Enthusiast
Original poster
Joined
Feb 26, 2021
Messages
136
Location
central PA
For about 2 weeks now I've been dealing with a check gauges and airbag light at startup. I believe these are separate issues that just coincidentally happened at about the same time, so I'm considering them separately for now.

The check gauges light is on for about a second or two after starting the Jeep. I've noticed that this coincides with the oil pressure gauge reading zero for that time. Then when the gauge levels off around 20 the light goes off. The only thing I can figure is the sending unit or the pump itself. Oil pressure is pretty normal for the most part during operation, constant 40 when moving and hovering around 20 at idle. Occasionally the gauge will dip below 20 at idle. Battery voltage has been steady at just under 14V, only a few months old and it were and alternator issue the battery would probably be dead by now.

As for the airbag light, it's on for maybe 10 seconds after starting. In a particularly unfortunate set of events, I both lost my key and had to have a new one cut by a locksmith and left the jeep in the rain with the top off for a few hours. My first thought is moisture in the clock spring, but I've read elsewhere that issues with the key in the ignition could cause an airbag light. The key was cut based off the dealer specs and the ignition switch has gone through 25 years of wear so maybe it's possible?

It's a 97 SE BTW.
 
Check the split wire loom harness for abrasions; that goes between the ECU and the vehicle sensors.
This harness runs along the back of the valve cover and is routed around the threaded head stud at the drivers rear of the valve cover. The head bolt threads have been known to wear thru the split wire loom and the harness wiring insulation which can short the 5V communications between the ECU and sensors.
 
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Check the split wire loom harness for abrasions; that goes between the ECU and the vehicle sensors.
This harness runs along the back of the valve cover and is routed around the threaded head stud at the drivers rear of the valve cover. The head bolt threads have been known to wear thru the split wire loom and the harness wiring insulation which can short the 5V communications between the ECU and sensors.
Finally got around to checking this out. I found the point you are describing, and the loom is still entirely in tact.
 
For about 2 weeks now I've been dealing with a check gauges and airbag light at startup. I believe these are separate issues that just coincidentally happened at about the same time, so I'm considering them separately for now.

The check gauges light is on for about a second or two after starting the Jeep. I've noticed that this coincides with the oil pressure gauge reading zero for that time. Then when the gauge levels off around 20 the light goes off. The only thing I can figure is the sending unit or the pump itself. Oil pressure is pretty normal for the most part during operation, constant 40 when moving and hovering around 20 at idle. Occasionally the gauge will dip below 20 at idle. Battery voltage has been steady at just under 14V, only a few months old and it were and alternator issue the battery would probably be dead by now.

As for the airbag light, it's on for maybe 10 seconds after starting. In a particularly unfortunate set of events, I both lost my key and had to have a new one cut by a locksmith and left the jeep in the rain with the top off for a few hours. My first thought is moisture in the clock spring, but I've read elsewhere that issues with the key in the ignition could cause an airbag light. The key was cut based off the dealer specs and the ignition switch has gone through 25 years of wear so maybe it's possible?

It's a 97 SE BTW.
I would inspect the oil pressure sending unit looking for seepage and verify the electrical connector is clean and fits snugly.
The air bag light may or may not be caused by dirty clock spring harness contacts, but as long as the indicator extinguishes within 10 seconds you shouldn't need to worry....
 
I would inspect the oil pressure sending unit looking for seepage and verify the electrical connector is clean and fits snugly.
The air bag light may or may not be caused by dirty clock spring harness contacts, but as long as the indicator extinguishes within 10 seconds you shouldn't need to worry....
Thanks, that's about what I was figuring. I'm definitely not worried about it, but it's just annoying. It's probably just going to be one of those things that's a pain in the ass to track down. I'll poke around when I get a chance and let you know if I figure it out.
 
Finally got around to this... everything seems to be in order on the sending unit side, but it looks like I have a slow oil leak from the RMS. For now I'm going to just keep an eye on things, I don't really see any reason to start digging into it and open up a can of worms until absolutely necessary.