Hello, my srs light on my 91 740. I have a spare steering wheel with an airbag. Am I able to swap the airbag with steering wheel without issues or are the airbags car specific. Thank you.

 

The problem may not be the airbag itself. Have you done diagnosing? I would more suspect the clockspring that runs to the steering wheel but either way it would need diagnosing before just swapping.

 

I havent done any diagnosing. What would be the best plan of action and regardless I bought the steering wheel cause it was a better condition than mine. Would swapping airbags with the wheel cause an issue

 

does this car have the A and B diagnostic block under the hood, near the left side spring tower, or is that only a 1993+ thing?

If you have the B diag block, plug the wire into B #5, turn the key on, then press the button on the A diag block for 3 full seconds and release, the light should flash 1-10 times, thats the error code.

if you don't have that B block, you need to take a piece of 18-22 gauge wire, with both ends stripped about 1/2", remove the ashtray to expose the fuse panel, note the 4 fuse positions along the front edge of the fuse panel, 2nd from the left has only one contact, thats the test point, plug one end of your wire into that, turn the ignition on and wait 15 seconds, then touch the other end of this wire to the ground shell of the cigar lighter socket for 2 full seconds, and the SRS light should flash once when you disconnect, then blink 1-10 times...

either of these, here's what the blink codes mean...

Code - Fault - Corrective Actions

1 - Fault in crash sensor - Check all electrical connections and/or replace crash sensor.

2 - Fault in standby power unit or in wiring between unit and sensor - Check all electrical connections between unit and crash sensor. Replace standby power unit. Replace crash sensor.

3* - Test terminal or SRS warning light lead is shorted to battery + or to ground. Symptom: warning light continuously on or always off.
(*SRS light will always be on or will not activate)
Check at test terminal connector for short circuit to battery + or ground. Check wiring harness and connectors

4 - Air bag assembly resistance low - Check wiring, contact reel, and connectors for short circuits. Measure resistance of contact reel. Replace air bag module

5 - Air bag assembly resistance high - Check gas generator connector. Check wiring and contact reel for open circuit. Replace air bag module.

6 - Not used

7- Not used

8 - Air bag or wiring shorted to battery positive + - a. Check wiring and connectors for shorts. b. Check wiring and contact reel. Measure circuit resistance. c. Replace crash sensor.

9 - Air bag assembly shorted to ground -. - a. Check for grounded gas generator wiring. b. Check wiring and contact ree for short to ground. Measure circuit resistance. c. Replace air bag module.

10 - Mercury switch in sensor shorted, or closed for more than one minute. Lead to seat belt tensioner shorted to ground or battery positive. - a. Ensure that crash sensor is correctly installed. b. Replace crash sensor.



this is taken from https://www.volvoclub.org.uk/faq/Ele...icCodesPre1992

 

oh, you have to clear the codes after reading them, too...

Without turning the key off, clear the fault codes. Ground the test terminal three times for at least 0.25 seconds each time all within a period of 1.5 to 5 seconds. It will probably take several tries to get the rhythm. The lamp will go out for 4 seconds, re-light for 3 seconds, and then go out. If the light does not stay out, then there is still a fault present and you will need to go further in to it.

Someone contributed: Always read the codes three times before resetting them. Often they will not reset after just one, or even two readings. If you still have SRS trouble codes, try this as a last resort. Disconnect the negative battery terminal clamp. Let the car sit for 1/2 hour. Reconnect the negative terminal clamp and drive the car. Do this three times. If the SRS light re-sets, fine. If not, it is time to replace the SRS sensor.