Yikes98 My $0.02 DIY Steering Angle Sensor (SAS) Repair on BMW i e92

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Polly Small
5 years ago
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faults on her 328i. The stealership, opps I meant dealership quoted me $1101.

02 fix for your enjoyment. Be very carefully as many components are small and fragile.

1 Yikes98 My $0.02 DIY Steering Angle Sensor (SAS) Repair on BMW i e92 First, thanks to all who posted on their SAS problems and pics. Using all that info I was able to piece together how to attack my wife s dreaded DSC faults on her 328i. The stealership, opps I meant dealership quoted me $ to RR the SAS including programming (what a deal huh?). Here is my $.02 fix for your enjoyment. Be very carefully as many components are small and fragile. PC type electronic component repair skills very helpful. Use this at your own risk as I guarantee nothing. 1) The dreaded DSC faults pic#1 & #2. 2) Disconnect negative terminal on battery (in the trunk) and wait 10 minutes or so to let all caps discharge.

clock position there are small slits on the

into. Feel for the spring and push to release the

(Tip Do a vin decoder check to see if you have a

2 3) Remove airbag. On each side of the steering wheel at 4 & 7 o clock position there are small slits on the surface, put a straight torx driver or allen key into. Feel for the spring and push to release the springs, pic#3 & #4. (Tip Do a vin decoder check to see if you have a Sport Steering wheel. If you don t then ignore picture s 3 and 4 and search youtube for non sport or another series airbag removal)

4) Carefully pry connector tabs and pull

3 4) Carefully pry connector tabs and pull upward to release locks and remove airbag connector s, pic#5. 5) Remove the two connectors near the top of the steering wheel. Using a small screwdriver release both tab releases, they are on top of the connector, pic#6. 6) Remove steering wheel bolt. The torque spec is 46 lb ft, pic#6.

4 7) Remove steering wheel, note the index marks at the bottom, pic#7 8) Now comes the hard part, splitting the steering wheel cowling. Carefully pry the inside and outside of the cowling split to release the circular tabs, pic#8. I used my fingers and screwdriver.

9) Remove the lower cowling and lift the upper one out of the way 10)

infamous SAS 11) Remove the two connectors from the back; one is a tab

12) Remove the clock spring assembly 2 tabs on the top and bottom and a

It will lift off as a whole assembly, pic #9.

5 9) Remove the lower cowling and lift the upper one out of the way 10) Remove the 4 torx bolts that hold the switch assembly that houses the infamous SAS 11) Remove the two connectors from the back; one is a tab release the other a lever release. 12) Remove the clock spring assembly 2 tabs on the top and bottom and a tab release near the bottom of the connector. It will lift off as a whole assembly, pic #9. Don t remove the clock spring cover tabs. 13) Put the assembly on an anti static pad and attach yourself to an anti static strap. Note the indexing marks to the left of the unit, pic #10.

14) Remove the SAS sensor housing cover, slowly working the tabs free.

15) Remove the IR LED cover using a t6 torx driver.

slowly pulling the disc off the assembly.

protective coating that deteriorated to form some crystal like stuff.

6 14) Remove the SAS sensor housing cover, slowly working the tabs free. Now you should see the optical disc, pic #11. 15) Remove the IR LED cover using a t6 torx driver. Then remove the optical disc by squeezing the tabs on the back and slowly pulling the disc off the assembly. The optical disc on the face side looked like it was coated with a protective coating that deteriorated to form some crystal like stuff. This was not the problem but I clean it off with meguiars #10 clear plastic polish. Leave the back side alone as it is etched with the encoder information, pic #12.

Using a small needle nose pliers pull the black cable releases down and away from the

7 16) Definitely do this at your very own risk. Remove the 3 torx screws on the pc board. Slowly lift up to expose the three ribbon cables underneath. Using a small needle nose pliers pull the black cable releases down and away from the connector. The cables should be free. Pull the pc board out of the assembly, 17) The IR LED and sensor pickup is shown in pic #13 & 14.

18) Using an IC type tip soldering iron (very small tip pic#15) reflow the connections for the IR LED and sensor.

19) Reassemble in the reverse order note all index marks. BTW here is pic#16 of the IR LED on with the cover removed.

20) No reprogramming the module, just keeping a grand or so in my pocket for other fun stuff.

steering wheel, SAS is re calibrated).it took me longer to write this and edit the pics than to actually troubleshoot and fix the problem.

8 18) Using an IC type tip soldering iron (very small tip pic#15) reflow the connections for the IR LED and sensor. I also did a bunch of components on both sides the board just for fun. Shotgun soldering to fix the cold solder joint problem. 19) Reassemble in the reverse order note all index marks. BTW here is pic#16 of the IR LED on with the cover removed. Sorry for the fuzzy picture, it was hard trying to take the picture while holding a black garbage bag to block the sunlight. 20) No reprogramming the module, just keeping a grand or so in my pocket for other fun stuff. (Update: After reconnecting the battery, make sure wheel is centered, start car, turn full lock left, then turn full lock right, recenter steering wheel, SAS is re calibrated).it took me longer to write this and edit the pics than to actually troubleshoot and fix the problem. Now the turn signals turn off automatically again, cruise control works again, headlights tracks the steering wheel again, and start off assistance works again. No fault codes on DSC/DTC. DSC/DTC works when I pull away from the car wash. Wife happy, life is good.

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