My accident repaired 01 coupe is at a friends shop. They just called and are getting a hard code of B0090. It is also saying "active switch voltage out of range"
Can anyone decipher this? Thanks in advance

 

here you go.
DTC B0090
Circuit Description
When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within the SIR system. The SDM monitors the I/P module disable switch-signal and I/P module disable switch indicator-control circuits in order to determine whether or not to disable the inflatable restraint I/P module. The SDM also monitors the I/P module disable switch-signal and the I/P module disable switch indicator-control circuits for an open, high resistance, short to ground or short to voltage condition.

Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC
The I/P module disable switch must be in the ON position.
The voltage detected in the I/P module disable switch indicator-control and the I/P module disable switch-signal circuits is less than 1 volt.
The voltage detected in the I/P module disable switch indicator-control and the I/P module disable switch-signal circuits is greater than 1 volt.
Action Taken When the DTC Sets
The SDM defaults to the OFF position, diabling the I/P module.
The SDM attempts to turn the inflatable restraint I/P module disable switch ON.
The SDM commands the AIR BAG indicator ON via Class 2 serial data.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
A history DTC will clear once 255 malfunction free ignition cycles have occurred.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:

A short to ground or a short to voltage in the I/P module disable switch-signal circuit
A short to ground or a short to voltage in the I/P module disable switch indicator-control circuit
Damage or corrosion on the I/P module disable switch harness connector
Damage or corrosion on the I/P module disable switch indicator harness connector
Damage or corrosion on the SDM harness connector
An internal I/P module disable switch malfunction
An internal I/P module disable switch indicator malfunction
An internal SDM malfunction
If an intermittent condition exists, refer to Testing for Intermittent and Poor Connections in Wiring Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table:

This step tests to see if there is an open or high resistance in the I/P module disable switch.

This step tests to see if there is a short to ground or a short to voltage in the I/P module disable switch-signal circuit.

This step tests to see if there is a short to ground or a short to voltage in the I/P module disable switch indicator-control circuit.

Step
Action
Yes
No

Schematic Reference: SIR Schematics

1
Did you perform the Diagnostic System Check-SIR?
Go to Step 2
Go to Diagnostic System Check - SIR

2
Turn OFF the ignition.
Disconnect the I/P module disable switch harness connector. Refer to Inflatable Restraint Instrument Panel (I/P) Module Disable Switch Replacement .
Inspect the I/P module disable switch harness connector for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 14
Go to Step 3

3
Inspect the I/P module disable switch terminals for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Do the I/P module disable switch terminals exhibit signs of damage or corrosion?
Go to Step 11
Go to Step 4

4
Remove the I/P module disable switch indicator harness connector. Refer to Inflatable Restraint Instrument Panel (I/P) Module Disable Switch LED Replacement .
Inspect the I/P module disable switch indicator harness connector for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 14
Go to Step 5

5
Inspect the I/P module disable switch indicator connector for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 14
Go to Step 6

6
Test the I/P module disable switch indicator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 14
Go to Step 7

7
Disconnect the inflatable restraint sensing and diagnostic module (SDM) harness connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
Inspect the SDM harness connector for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 14
Go to Step 8

8
Inspect the SDM terminals for damage or corrosion that may cause the malfunction. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Do the SDM terminals exhibit signs of damage or corrosion?
Go to Step 13
Go to Step 9

9
Test the I/P module disable switch - signal circuit for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 14
Go to Step 10

10
Test the I/P module disable switch indicator - control circuit for a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 14
Go to Step 11

11
Replace the I/P module disable switch. Refer to Inflatable Restraint Instrument Panel (I/P) Module Disable Switch Replacement .

Did you complete the replacement?
Go to Step 12
--

12
Reconnect all SIR components.
Use the scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC as specified within the supporting text.
Does the DTC rest?
Go to Step 13
System OK

13
Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the replacement?
Go to Step 14
--

14
Reconnect all SIR components.
Use the scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC as specified within the supporting text.
Does the DTC rest?
Go to Step 2
System OK



--------------------------------------------------------------------------------
Document ID# 709008
2002 Chevrolet Corvette

 

Wow.....complex. We will work on this. And thank you.

 

Looks like a trip to the dealer is in the works....
In the meantime, I was wondering, is the "active switch" mentioned in this code simply another name for the control module.

 

I believe it is the switch on the console to disable the airbag.

 

Actually, in my case {01} the switch is in the glove box.
The switch was in the off position at the time of the accident, and I had just left it in that position. However, I just went out and moved it to the on position. Low and behold the air bag light goes off !!!!
It first flashes 4 times, but it does go off.
Would this indicate simply a bad switch possibly? thanks in advance