1990-1990 C4 Corvette Front Air Bag Impact Sensor OEM 10094613

[Pat Cooke]

Hi,
RE: 1990-1990 C4 Corvette Front Air Bag Impact Sensor OEM 10094613

Can anybody say where I can purchase a new sensor for my 1990 ZR1 ?

Regards,
Pat

[G8nightman]

Rare part good luck in your search.


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[GOLDCYLON]

New or NOS almost unobtainium. Keep your eyes open on Ebay for a part out or quality used part. These are a one year only part however, any 1990 C4 airbag sensor is the same part as the 90 ZR-1. Very tough find

[Pat Cooke]

New or NOS almost unobtainium. Keep your eyes open on Ebay for a part out or quality used part. These are a one year only part however, any 1990 C4 airbag sensor is the same part as the 90 ZR-1. Very tough find

Hi, Thanks for the reply, do you know if any other airbag sensors will work or can my sensor be serviced ?

Regards,
Pat

[GOLDCYLON]

Yes I do and the answer is no. The 90 model year was a one year only part as I stated earlier. No it cannot be serviced however it may not be the sensor that’s the problem but rust between the sensor at the frame mounting point. Cleaning and removal of the rust followed by coating with a lot of dyelectric grease may solve your problem


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[Ccmano]

What GC said...

Have you checked the sensor grounds first? The following is one of Dynomites great write ups.

Both Right and Left Air Bag impact sensors were regrounded.
(The bolt sizes cited are the wrench sizes to remove the bolt)

a. For the Drivers side, the side panel was removed (top bolt and bottom bolt loosened and three Torx bolts removed from fender well).
The bottom bolt was loosened by sliding an open end 10mm wrench in the slot provided.
b. The battery was disconnected (plus and minus) and hold down clamp removed.
c. The battery platform was removed (two 10 mm bolts on top and two 10 mm bolts on bottom front side).
d. The Impact Sensor was removed (one 10 mm bolt and one 13 mm bolt) in additon to the battery ground cable and engine ground cable.
e. The two bolt holes of the sensor and grounds bolt holes were sanded clean and the bottom of the impact sensor was polished with steel wool.
f. The Impact Sensor was then replaced and the area spray painted black Rustoleum to seal and prevent corrosion of the polished areas.
g. The various components were then assembled in reverse order.

h. For the Passenger Side, the side panel was removed (top bolt and bottom bolt loosened and three Torx bolts removed from fender well).
The bottom bolt was loosened by sliding an open end 10mm wrench in the slot provided.
i. The rear wheel well cover was removed (four 10 mm bolts on forward edge loosened and two 10 mm bolts removed).
The 10 mm bottom bolt for the wheel well cover was also removed.
j. The windshield water bottle was removed and set aside without disconnecting the water line (three 10 mm bolts).
k. The Impact Sensor was removed (one 10 mm bolt and one 13 mm bolt).
l. The two bolt holes of the sensor were sanded clean and the bottom of the impact sensor was polished with steel wool.
m. The Impact Sensor was then replaced and the area spray painted black Rustoleum to seal and prevent corrosion of the polished areas.
n. The various components were then assembled in reverse order.

3. Inflation Rest Reconditioning ground only applies to 1990 ZR-1.

This from Marc.......(edited a bit)
For the 1991 through 1993 the Air Bag Sensors do not have to be grounded to work in a crash....they DO need to be attached to the Frame Rails however. The Grounding requirement (Code 16 and Code 26) of the Air Bag Sensors on the 1990 was set up to assure the sensors were attached to the Frame Rails. If the bolts were removed from the sensors the sensor would pass as air bag deployable but would not actually deploy the air bag for obvious reasons. This explains why I got NO INFL REST warning on the panel when I totally removed the 1991 Sensor from the Frame Rail in my test.

I am now thinking the Air Bag Sensors on the 1990 ZR-1 will function and Deploy the Air Bag even if not grounded. The 1990 Air Bag Sensors will only appear not grounded/not connected on the panel as INFL REST indicating/suggesting the Air Bag Sensors are not installed when in fact they ARE Installed. To get rid of that INFL REST Indication on the Panel (as well as the Red Seat Belt Indication) requires the Air Bag Sensors be Re-Grounded. I am not going to jar the Air Bag Sensor to see if the Air Bags Deploy to test that theory.

If any of the listed faults 21 - 26 for the 1991-1993 were detected in a self test the INFL REST will appear on the 1991-1993 panel. These faults are listed for the 1991-1993 in the ALDL Fault Code Sticky above this technical section.

21 Steering Column Resistance Too High
22 Steering Column Resistance Too Low]
23 Steering Column Circuit Voltage Too High
24 Steering Column Circuit Voltage Too Low
25 Short to Battery in Steering Column
26 Open in Steering Column

Now for the 1994-1995 since two air bags are used has different codes and there is NO SIR diagnostic terminal as indicated.
The 1994-1995 design requires a TECH 1 diagnostics because the data is sensitive as a result of Government Regulations. On the 1994-1995 ALDL Code Reader when used with Adapter I have noted SIR (the RED BUTTON) is NOT used See Item #3 ALDL Fault Code Reader/Eraser. All other Codes are readable using the 94'-95' Adapter with the ALDL Code Reader.

Marc Haibeck ALDL Connector Functional Description

[Pat Cooke]

Hi,
Many thanks for very useful information. I will check the grounding.

[Marc Haibeck]

I have never seen a '90 crash sensor fail. The sensor must make an electrical connection to the frame. Clean and seal the area under the sensor. The error code needs to be cleared using the procedure in the service manual. The SIR lamp will not go out until the clear code procedure is performed.

Sometimes the sensor connector in the car causes the error. Unplug and reconnect the connector to wipe and reseat the contacts. The air bag wiring is color coded yellow.

[Dynomite]

Clearing Codes and checking sensor connector inside car are discussed........
See Item #6 for Connection Inside Car......
Complete photos on restoring Sensor Grounding are included.

Ignition Key Codes and Clearing 1990 INFL REST Codes (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-3.html#post1581564095)

[A1990]

I chased this error around for a year. Finally checked the connection inside the car and problem fixed. Thanks Cliff!!


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