"Infl Rest" Code

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Oct 14, 2010 | 01:14 PM

ksch994462

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"Infl Rest" Code

I am intent on fixing the "Infl Rest - Seatbelt" lights which don't go off after I start my 1990 convertible. I am 100% POSITIVE that I have the sensor contacts on the LH sensor well cleaned and greased with dilectric grease. When I reset the code (16), the lights both go out and then come back on after about ten seconds. I have conflicting instructions - one says that code 16 is the LH side (Driver Side.) The other says that 16 is the code for the RH side. Which is correct? If 16 is the LH side, then I must have a bad sensor. Good advice is greatly appreciated. Tks...

Oct 14, 2010 | 05:24 PM

Kleantouch

Instructor

Joined: Jun 2005

Posts: 223

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From: Lake Charles LA

My FSM says-

" code 16- Front Sensor#1 (LH) Sensor fault"
Code's 14, 15 and 16 deal with the LH sensor, codes 24, 25 and 26 deal with the RH
code 14- Shorted to ground (LH)
Code 15- Open (LH)

code 24- Shored to ground- (RH)
code 25- Open (RH)
code 26- Sensor fault (RH)

Clearing codes- Ground ALDL terminal K
Turn IGN ON
Wait for fault coeds to begin flashing (approx 5 secs). When codes begin flashing, unground ALDL terminal K for 3 secs +/- 1/2 sec.
After ungrounding ALDL terminal K as described, ground it again for 3 secs, +/- 1/2 sec
Unground ALDL terminal K, wait 10 secs, turn IGN OFF

Several others have commented that you may have to do this 2, 3, 4 or more times to get the timing right on clearing the codes-

I cheated- bought a $20 switch tool from Midamerica designed to do this- just had to follow directions, and the light is still off- +2 years.

Good luck.

Oct 14, 2010 | 05:28 PM

Kleantouch

Instructor

Joined: Jun 2005

Posts: 223

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From: Lake Charles LA

BTW- you mention sensor contacts- are you talking about the wire conectors that connect to the sensor- I always thought the major problem with the sensors was rust and corrosion on the frame preventing the sensor from making the ground- and the frame had to be cleaned and de-corroded in order to get it to work.

Somebody who didn't cheat may want to chime in.

Oct 14, 2010 | 05:28 PM

ksch994462

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Quote:

Originally Posted by Kleantouch

I also bought the gadget from Midamerica and am following the directions. It just wont stay off. Thanks,,,

Oct 14, 2010 | 05:34 PM

Kleantouch

Instructor

Joined: Jun 2005

Posts: 223

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From: Lake Charles LA

Keep trying it- my 3 secs and your 3 secs and Midamerica's 3 sec (maybe China's 3 secs) may all be different. I'd do it a whole bunch, then call Midamerica, and if no joy, I'd start replacing sensors- but that's just me.....

Oct 14, 2010 | 05:48 PM

ksch994462

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I definitely will. BTW, do you know if the sensor can be replaced by an average owner? I WORRY ABOUT MAYBE SCEWING IT UP AND SETTING OFF THE AIRBAG WHEN I HOOK THE BATTERY UP AGAIN. WOTUTHINK???

Oct 14, 2010 | 06:20 PM

Kleantouch

Instructor

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From: Lake Charles LA

I would hope it could be replaced by an average C4 owner like me- I might ohm out the new sensor to make sure if I accidentally jarred it or otherwise forced whatever contacts inside to "make" that they unmade before i hooked the Batt back up. Or tried ohming out the old one to see if it was momentary "on" or not. Or maybe read the FSM- It says to handle them carefully- I'm sure the parts guys at the stealers handle them carefully.

Good luck. Keep us posted.

Oct 14, 2010 | 07:10 PM

ksch994462

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Will do. It'll be a while before I feel brave enuff. Tks... Keith

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Oct 14, 2010 | 07:16 PM

jimmers

Safety Car

Joined: Mar 2005

Posts: 4,723

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From: Winnipeg Manitoba, Canada

The seatbelt light is the secondary light for the airbag system. My seatbelt light would not go off no matter what I did. It turns out I had a bad DERM. Once I replaced it, it went off. Do a search, there are tons of threads on this.

Last edited by jimmers; Oct 14, 2010 at 07:20 PM.

Oct 15, 2010 | 07:49 PM

#10

pipe

Drifting

Joined: Jan 2003

Posts: 1,894

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From: Reading PA.

Correct a code 16 is the left hand side sensor. Before doing any work on the system DISCONNECT THE BATTERY and wait about 15 min. The sensors are on the frame rails close to the firewall. The drivers side can be seen by removing the battery. The sensor is about an inch square. Remove it and take a dremel tool with a grinding stone and clean the area where the sensor sits. Also clean the bottom of the sensor real good. Apply a coat of Dielectric Grease to the bottom of the sensor. When you put the sensor back on put a small star washer on the bolt to help make a better ground. Then go ahead and use the Mid America tool/button to clear the code and turn off the INFL REST/SEATBELT light. The tool is kinda touchy so you might have to try it a couple of times to knock it out. If none of this works you might have a bad sensor and you will need to unplug it and take an ohm meter to it to make sure. The plug for it is in the drivers footwell area down behind your pedals it's yellow in color and has 3 pins in the connector and it just pulls apart. The sheets that come with the mid america tool tell the ohm specs for it. GOOD LUCK Pipe

Oct 16, 2010 | 12:08 AM

#11

Churchkey

Melting Slicks

Joined: Sep 2008

Posts: 2,376

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From: Cherokee National Forest TN

Oct 16, 2010 | 01:28 PM

#12

pipe

Drifting

Joined: Jan 2003

Posts: 1,894

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From: Reading PA.

CORRECT for the ohm specs. Make sure you ohm the pigtail comming in from the sensor not the lead going to the DERM module. I don't think the GM stealership sells the sensors anymore. Pipe

Oct 18, 2010 | 08:13 AM

#13

trulytex

Burning Brakes

Joined: Apr 2006

Posts: 805

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From: Okeechobee FL

I am going to try to fix mine today. My code is for the RH sensor. ANy tips on how to get to it?

Oct 18, 2010 | 09:25 AM

#14

UNCLEBILL

Pro

Joined: Jun 2007

Posts: 626

Likes: 2

From: Coquitlam British Columbia

Quote:

Originally Posted by ksch994462

I also bought the gadget from Midamerica and am following the directions. It just wont stay off. Thanks,,,

I found with my 1990 Vert when my RH sensor went; I did the sanding and the greasing and followed the FSM instructions for time..3 sec on and off..it still stayed on...I then tried the clearing instructions AFTER the 3 code 12 blinks and cleared it. To me the instructions are vague and it led me to believe that you start the clearing at the start of the blinking (code 12). It worked for me immediately after I got into the default code blinking.
Hope this helps...!!!!