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Actually I don't recommend car owners working on the air bag system. It can be very dangerous should one of the bags deploy by accident. Code 33 is for an open or high resistance on the passenger side bag circuit which could be several different components or the wiring harness.
I was unable to locate code 31 in my book here is a copy of the codes. looks like you just need a fuse for #51. this may fix 31 as well.
Diagnostic Trouble Code Table 1994
AIR BAG DIAGNOSTIC MONITOR DIAGNOSTIC TROUBLE CODE PRIORITY TABLE Priority Code Component/Fault Description Highest - No Air Bag Indicator - Inoperative Lamp Circuit or No Ignition Voltage to Air Bag Diagnostic Monitor
Continuous Air Bag Indicator - Air Bag Diagnostic Monitor Disconnected or Inoperative 12 Low Battery Voltage 13 Air Bag Circuit Shorted to Ground 14 Primary Crash Sensor Circuit Shorted to Ground 21 Safing Sensor Not Mounted to Vehicle Properly 22 Safing Sensor Output Shorted to Battery Voltage 23 Safing Sensor Circuit Input Feed/Return Circuit Open 24 Safing Sensor Output Feed/Return Circuit Open 32 Driver Side Air Bag Module High Resistance or Open 33 Passenger Side Air Bag Module High Resistance or Open 34 Driver Side Air Bag Module Circuit Low Resistance or Shorted 35 Passenger Side Air Bag Module Low Resistance or Shorted 42 Center Radiator Primary Crash Sensor Feed/Return Open 44 Center Cowl Primary Crash Sensor Not Mounted to Vehicle Properly 45 Center Radiator Primary Crash Sensor Not Mounted to Vehicle Properly 51 Diagnostic Monitor Internal Thermal Fuse - Fuse Blown Due to Intermittent Short to Ground 52 Backup Power Supply - Voltage Boost Fault 53 Primary Crash Sensor Circuits - Resistance to Ground or Air Bag Diagnostic Monitor Failure
Lowest - Rapid Continuous Flashing of Air Bag Indicator (No DTC) All Primary
the flashing is a code, you need to get a pen and a piece of paper and decode this. It is a two digit number the first set of flashes is the first number so lets say it flashes 3 times and then pauses for 3 to 5 seconds your first number would be 3 and then after the pause it blinks 4 times that would be your second number... so your code would be 34. anyways here is a list of the code meanings so after you count the two set of flashes and get your code compare it here
12=Low Battery Voltage
13=Air Bag Circuit Shorted to Ground
14=Primary Crash Sensor Circuit Shorted to Ground
21=Safing Sensor Not Mounted to Vehicle Properly
22=Safing Sensor Output Shorted to Battery Voltage
23=Safing Sensor Circuit Input Feed/Return Circuit Open
24=Safing Sensor Output Feed/Return Circuit Open
32=Driver Side Air Bag Circuit High Resistance or Open
33=Passenger Side Air Bag Circuit High Resistance or Open
34=Driver Side Air Bag Circuit Low Resistance or Shorted
35=Passenger Side Air Bag Circuit Low Resistance or Shorted
41=RH Primary Crash Sensor Feed/Return Circuit Open
42=LH Primary Crash Sensor Feed/Return Circuit Open
44=RH Primary Crash Sensor Not Mounted to Vehicle Properly
45=LH Primary Crash Sensor Not Mounted to Vehicle Properly
51=Air Bag Diagnostic Monitor Internal Thermal FuseFuse Blown Due to Intermittent Short to Ground
52=Backup Power SupplyVoltage Boost Fault
53=Primary Crash Sensor Circuits Resistance to Ground or Air Bag Diagnostic Fault
12 Low Battery Voltage | 13 Air Bag Circuit or Crash Sensor Circuit - Shorted to Ground | 21 Safing Sensor - Not Mounted on Vehicle Properly | 22 Safing Sensor Output Circuit - Shorted to Battery Voltage | 23 Safing Sensor Input Feed/Return Circuit Open | 24 Open in Circuit 944B or Low Resistance in Crash Sensor(s) | 32 Driver Side Air Bag/Safing Sensor Circuit - High Resistance or Open | 33 Pin 7 Not Grounded at Diagnostic Monitor | 34 Driver Side Air Bag/Safing Sensor Circuit - Low Resistance or Shorted | 35 Low Resistance Across Pins 8 and 9 at Diagnostic Monitor | 41 Crash Sensor Circuit - High Resistance or Open | 44 RH Crash Sensor - Not Mounted to Vehicle Properly | 45 Center Radiator Crash Sensor - Not Mounted to Vehicle Properly | 46 LH Crash Sensor - Not Mounted to Vehicle Properly | 51 Diagnostic Monitor Internal Thermal Fuse - Blown and Short to Ground No Longer Exists | 52 Backup Power Supply - Voltage Boost Fault | 53 Internal Diagnostic Monitor Fault Lowest -- Rapid Continuous Flashing of Air Bag Lamp - All Crash Sensors Disconnected
The air bag module monitors all of the electrical circuits of the air bag system. If it detects a fault in any of these circuits, it will cause the air bag light to come on. If it's flashing, count the number of flashes between pauses, this should be the diagnostic code the module is telling you what is wrong with the airbag system (or you can use a scan tool) The only way to keep the light off (besides removing it from dash) is to repair the fault, you can clear the code with the scantool, but it will come right back on if it still sees the fault.