"Infl Rest" Code
Thread Starter
Advanced
Joined: Oct 2009
Posts: 64
Likes: 0
"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...
Instructor
Joined: Jun 2005
Posts: 223
Likes: 2
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.
" 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.
Instructor
Joined: Jun 2005
Posts: 223
Likes: 2
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.
Somebody who didn't cheat may want to chime in.
Thread Starter
Advanced
Joined: Oct 2009
Posts: 64
Likes: 0
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.
" 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.
Instructor
Joined: Jun 2005
Posts: 223
Likes: 2
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.....
Instructor
Joined: Jun 2005
Posts: 223
Likes: 2
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.
Good luck. Keep us posted.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Safety Car
Joined: Mar 2005
Posts: 4,723
Likes: 11
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.
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
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
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
Hope this helps...!!!!
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
