Pass key fault - Chevy Impala SS Forum
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post #1 of 37 (permalink) Old 01-07-2018, 12:29 PM Thread Starter
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Pass key fault

Warning light has popped up on the dash. Car starts and runs fine. Checked a spare key that I had and same fault light shows up on the dash. Any ideas?
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post #2 of 37 (permalink) Old 01-07-2018, 01:16 PM
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Warning light has popped up on the dash. Car starts and runs fine. Checked a spare key that I had and same fault light shows up on the dash. Any ideas?
spray electrical contact cleaner in the key hole.
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post #3 of 37 (permalink) Old 01-07-2018, 02:33 PM Thread Starter
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Would mass airflow sensor cleaner work also? That's all I have at the moment.
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post #4 of 37 (permalink) Old 01-07-2018, 05:11 PM
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I had the PASS KEY light on and it started fine for a long time. Never had issues but I was always worried it wouldn't start at an inopportune moment, so I disabled the theft deterrent module (TDM). Super easy. It does require you to have VATS tuned out of the car. If you've had a mail order tune, some tuners do it by default. If you don't have a tune yet, now is the time.

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1996 Roadmaster Wagon
1995 Caprice Wagon
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post #5 of 37 (permalink) Old 01-07-2018, 07:38 PM Thread Starter
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Sorry, not familiar with the TDM and VATS tune. Can you elaborate a little more? Is there any other way to disable this light? Have yet to try the contact cleaner route.
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post #6 of 37 (permalink) Old 01-08-2018, 08:30 AM
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Would mass airflow sensor cleaner work also? That's all I have at the moment.
CRC MAF cleaner is electrical cleaner. MAF has electronics/circuits which is why this must be used. do not use any acetone products .. read the label on any cleaner cans...
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post #7 of 37 (permalink) Old 01-08-2018, 03:00 PM
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Sorry, not familiar with the TDM and VATS tune. Can you elaborate a little more? Is there any other way to disable this light? Have yet to try the contact cleaner route.
you can disable the light by removing it. You can resolve the underlying issue by trying to clean the pellet or ignition cylinder. You can use isopropyl alcohol 99% as well. Or you can disable the TDM. The way to do it comes up in a search.

You can essentially fix the pass key fault issue for 0$, provided VATS is disabled in your .bin.

- Disable VATS in tune. If you've had your car tuned, hopefully it's already done. IIRC PCM4less does it automatically.
- move your driver's seat back and lie on your back looking under the dash. Over the E-brake, there's a black box held on by 1x 7mm screw. That is the Theft Deterrent Module (TDM) Remove the screw, drop the box. Detach the relay from the box but leave the relay connected. Remove the connector to the TDM, then jumper A4 to B5 (yellow/gray to black/white). http://www.goldsswagon.com/diagrams/...key_no_seo.pdf

See this post for pic of the TDM: https://www.impalassforum.com/vBullet...5-post210.html << found in search
user TGO's method works, but is a more complicated way of doing the same thing.

You can also use the resistor method, but I don't like it because it's more complicated for no reason. By disabling your car can be started with any correctly cut key, with or without pellets. The Pass Key Fault light will no longer illuminate, nor will the TDM disable injectors or starter.

Jason
1996 Roadmaster Wagon
1995 Caprice Wagon
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post #8 of 37 (permalink) Old 01-13-2018, 07:00 PM Thread Starter
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Can I determine the resistance of my key/pellet via ohmmeter?
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post #9 of 37 (permalink) Old 01-13-2018, 07:54 PM
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Can I determine the resistance of my key/pellet via ohmmeter?
Yes, set your meter to ohms and then place each lead on either side of the key pellet and that is the resistance your key pellet is.

1996 DGGM Impala SS
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post #10 of 37 (permalink) Old 01-14-2018, 08:02 AM
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Can I determine the resistance of my key/pellet via ohmmeter?

you still have this problem ? check that all your keys have the same resistance.

now if you did spray electrical contact cleaner in the key hole and still the light many have had these resistor pellet worn then poor contact in the key hole . I have the chart for the resistance / key to be used . not good using a key ring with other keys wearing at these pellets.

my keys are 1700 ohms..
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