1993 940 non turbo SRS light

[anotherMattsDad]

I had replaced the drivers air bag, rt seat belt pretension er, ACM Airbag control module, but not the left seat belt pretension er after a previous wreck, the SRS light came on, naturally , I have now replaced the left tension er , can I reset the light and activate the system or does it require a special scan tool (dealer type)

[billofdurham]

1993+ 940s have an on-board diagnostic system for the Supplemental Restraint System that both monitors the system and stores any fault codes for later diagnosis. You can read and erase codes using the OBD box in the engine compartment.

To read the codes:

1. Remove the selector lead from the side of box "A" and insert it into terminal 5 of output box "B".
2. Turn the ignition "on" to key position II.
3. Wait about ten seconds. Press the button on box "A" for about 1 second.
4. Read off the LED flashes. Codes have three digits. If code 1-1-1 is read, there are no stored fault codes. If a code other than 1-1-1 is obtained, write it down and press the button again to see if there are more. When the first code recurs, all codes have been read.

Some people advise reading the codes three times before resetting them. Often they will not reset after just one, or even two readings.

Code Fault
1-1-1 OK: No faults detected in the OBD system
1-1-2 Internal fault in the sensor unit
1-2-7 SRS lamp, short circuit or break in circuit
2-1-1 Steering wheel module, short circuit in wiring
2-1-2 Steering wheel module, break in wiring
2-1-3 Steering wheel module, short circuit to ground
2-1-4 Steering wheel module, short circuit to +12V
2-2-1 Passenger module, short circuit in wiring
2-2-2 Passenger module, break in wiring
2-2-3 Passenger module, short circuit to ground
2-2-4 Passenger module, short circuit to +12V
2-3-1 Seat belt tensioner left, short circuit in wiring
2-3-2 Seat belt tensioner left, break in wiring
2-3-3 Seat belt tensioner left, short circuit to ground
2-3-4 Seat belt tensioner left, short circuit to +12V
2-4-1 Seat belt tensioner right, short circuit in wiring
2-4-2 Seat belt tensioner right, break in wiring
2-4-3 Seat belt tensioner right, short circuit to ground
2-4-4 Seat belt tensioner right, short circuit to +12V

To clear fault codes other than 1-1-2 (indicating a crash sensor fault, which must not be cleared but rather returned to the dealer):
Read the codes three times before clearing.
Remove the selector lead from the side of "A" and insert it into terminal 5 of output box "B".
Turn the ignition "on" to key position II.
Press the button on box "A". Keep it pressed for at least 5 seconds.
Release the button. The LED lights.
Press the button again when the LED lights and keep it pressed for at least 5 seconds.
The codes are now cleared.
To check whether codes are cleared, repeat procedure A above.

If codes remain, then the fault persists and must be repaired. However, as a last resort you can try this:
Disconnect the negative battery terminal and leave it for 30 minutes. Reconnect the negative terminal and drive the car. Do this three times. If the SRS light re-sets things are good. If not, it is time to replace the SRS sensor and the power module.

Bill.

[anotherMattsDad]

Thanks Bill,

Pulled codes it was as suspected, 232, the LH seat belt, Followed your directions to a T, and reset the light, 12 drive cycles and 60 miles all is great, no light,

Thanks again for help and assistance,

Rick

[billofdurham]

Thank you for the update.

Bill.