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Old 07-19-2021, 11:52 PM   #1
afskwarek
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Default Oil Pressure Lamp Won't Turn On Even With Good Bulb

Hi,

I worked on swapping my gauge lights with leds on my 99 sl1 and noticed an issue after I got done. Upon the ignition on, dash lights test, all my warning lights etc were good except the oil pressure light. It has a good bulb. I switched around the bulb in case polarity was wrong. Still didn't light up. Maybe I damaged something? To test that, I even swapped the gauge cluster with a spare one I had on hand. Oil pressure light still wouldn't light up, and I made sure that one had a good bulb too. Normally, wouldn't really care. But if there's ever an issue with oil pressure, I'd certainly want to know. Really not sure why it's not coming on.
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Old 07-20-2021, 08:44 AM   #2
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

What happens when you unplug the oil pressure sensor?
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Old 07-20-2021, 09:25 AM   #3
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Isn't the sender a normally closed switch? So if you unplug it and short to ground the light should be on.

http://www.saturnfans.com/forums/sho...&postcount=269

That would check the circuit excluding the sender.
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Last edited by Waiex191; 07-20-2021 at 09:28 AM. Reason: Added OldNuc quote
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Old 07-20-2021, 10:21 AM   #4
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

I've had it come unplugged a few times scaring the...oil...out of me with the red "change engine soon" light coming on, but yes the next step after unplugging is grounding to check the ground leg of the circuit.

I'd have to dig further to see where the power leg comes from.
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Old 07-20-2021, 04:54 PM   #5
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Follow up, yeah I tried unplugging the sensor. Even plugged it in to another sensor and let it hang loose to simulate a lack of oil pressure. Light still won't come on.
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Old 07-20-2021, 06:00 PM   #6
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Quote:
Originally Posted by afskwarek View Post
Follow up, yeah I tried unplugging the sensor. Even plugged it in to another sensor and let it hang loose to simulate a lack of oil pressure. Light still won't come on.
Take the wire off the sensor and ground it to the block to simulate loss of oil pressure.
...
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Old 07-20-2021, 08:02 PM   #7
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

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Take the wire off the sensor and ground it to the block to simulate loss of oil pressure.
I apologize. My electrical knowledge pretty bad. Please correct me if have trouble following. So, cut the negative wire before the connector and attach it to the block? While keeping the sensor attached?
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Old 07-20-2021, 08:08 PM   #8
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Do not cut the wire, slip a small wire (paper clip?) into the harness connector and touch that "probing" wire to ground. I have no schematic showing that circuit, so cannot confirm which wire to be grounded.
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Old 07-20-2021, 09:22 PM   #9
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Like Bill said - a paper clip or something. Here is the schematic of the switch. The other side goes to the wire that goes hot with the ignition.
Attached Images
File Type: png oil pressure sender schematic.png (20.9 KB, 64 views)
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Old 07-21-2021, 10:10 PM   #10
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Quote:
Originally Posted by billr View Post
Do not cut the wire, slip a small wire (paper clip?) into the harness connector and touch that "probing" wire to ground. I have no schematic showing that circuit, so cannot confirm which wire to be grounded.
Alright. Here's what I did. No changes. Hopefully, I did it right.

https://ibb.co/ckGqD6y
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Old 07-21-2021, 10:31 PM   #11
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Did you take some strands off the big wire you used, so that it could reach all the way in and touch the connector contact? And, it is going into the position for the TAN wire?

If the answer is "yes" to both, then that looks fine.

You should also try measuring voltage from that TAN wire to ground (key-on). There should be some voltage there, probably 5VDC. Be sure to use a multimeter, a test light may be too much load to give an effective test of that signal circuit.
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Old 07-22-2021, 12:02 AM   #12
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Totally missed that OP put LED's in. L-ight E-mitting D-iode. Diode = electrical shunt that basically means polarity matters.

The cluster bulb sized LED usually doesn't have polarity marked and even if it does...the cluster itself isn't clearly marked. If it doesn't work one way, flip it to the other. If it doesn't work the other way either then carefully screw with the 2 metal contact tabs until it works or try one of the other bulbs.
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Old 07-22-2021, 07:09 PM   #13
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

OP: stated "It has a good bulb. I switched around the bulb in case polarity was wrong. Still didn't light up."
So, might be a bad LED.
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Old 07-23-2021, 08:37 AM   #14
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

OP should put the original OEM bulb (not LED) back in the oil pressure slot and see if it functions normally.
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Old 07-23-2021, 08:19 PM   #15
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

I tried about half a dozen leds, switched them around for polarity. Also tried about half a dozen regular incandescents, with two different clusters. Didn't come on with anything.
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Old 07-23-2021, 08:42 PM   #16
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Quote:
Originally Posted by billr View Post
Did you take some strands off the big wire you used, so that it could reach all the way in and touch the connector contact? And, it is going into the position for the TAN wire?

If the answer is "yes" to both, then that looks fine.

You should also try measuring voltage from that TAN wire to ground (key-on). There should be some voltage there, probably 5VDC. Be sure to use a multimeter, a test light may be too much load to give an effective test of that signal circuit.
To answer your first paragraph. Yes for both. I did get a multimeter (set to 20dcv) and touched negative probe to block, and positive probe to the connector, while I had someone turn the ignition to run for the lamp test. I did not detect any voltage.
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Old 07-23-2021, 10:50 PM   #17
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Quote:
Originally Posted by afskwarek View Post
To answer your first paragraph. Yes for both. I did get a multimeter (set to 20dcv) and touched negative probe to block, and positive probe to the connector, while I had someone turn the ignition to run for the lamp test. I did not detect any voltage.
When I look at the circuit I'd say it should be 12 volts. I don't think we have any 5 volt sources.

Since you did not see any voltage, there is an open somewhere. Either the wire, panel, bulb (which seems like you have tried a few), or some other connector.
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Old 07-23-2021, 11:06 PM   #18
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

The MAP, TP, ECT, IAT, and EGR sensors are all powered from the 5V supply in the PCM. Still, since it is neither 5V or 12V (either is a candidate), then that end of the circuit needs to be checked; no argument there!
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Old 07-24-2021, 01:00 AM   #19
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

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Originally Posted by Waiex191 View Post
When I look at the circuit I'd say it should be 12 volts. I don't think we have any 5 volt sources.

Since you did not see any voltage, there is an open somewhere. Either the wire, panel, bulb (which seems like you have tried a few), or some other connector.
Alright. I have the shop service manual disk and have looked all over and haven't found the schematic that includes the oil pressure switch, figured that would help. Any idea where I can find it? Cause I didn't see it in the instrument cluster schmatics. Other than that, what should I look for now?
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Old 07-24-2021, 07:57 AM   #20
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Default Re: Oil Pressure Lamp Won't Turn On Even With Good Bulb

Quote:
Originally Posted by billr View Post
The MAP, TP, ECT, IAT, and EGR sensors are all powered from the 5V supply in the PCM. Still, since it is neither 5V or 12V (either is a candidate), then that end of the circuit needs to be checked; no argument there!
Thanks, I did not know that about the 5V. From the schematic the bulb is lit by 12V.
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