1999 Cadillac STS ABS TRACTION CONTROL

Tiny
99CADDIE
  • MEMBER
  • 1999 CADILLAC STS
  • V8
  • FWD
  • AUTOMATIC
  • 122,000 MILES
MY ABS TRACTION CONTROL LIGHT IS ON AND IN THE MESSAGE CENTER SAYS SERVICE STIBILITY CONTROL
I was wondering what I needed to do to fix this. The service garage changed something out in the steering column but the first time I had to brake hard the lights came on again. So I took it back and they said the wires were corroaed at the terminals at the computer ends and that I would need a new computer to repair the problem. They wanted $3000 for the computer. Couldn't afford that. So I was wondering if I could fix this my self. I know its not the computer.
Do you
have the same problem?
Yes
No
Tuesday, October 12th, 2010 AT 3:37 PM

9 Replies

Tiny
FACTORYJACK
  • EXPERT
Do you perhaps have a diagnostic code number, or fault that they have referenced. The steering position sensor is a common fault. If you don't know the code, I can walk you through getting it from the vehicle itself.
Was this
answer
helpful?
Yes
No
Tuesday, October 12th, 2010 AT 5:34 PM
Tiny
99CADDIE
  • MEMBER
OK could you help me get the codes?
Was this
answer
helpful?
Yes
No
Tuesday, October 12th, 2010 AT 6:19 PM
Tiny
FACTORYJACK
  • EXPERT
With the key on, press and hold the info button up, and the on/off button together until the segments light up. At that point it should read ALL? On the info center. Press on/off again and it should change to ALL CODES, press the on/off again. The first codes to display will be for ABS and continue alphabetically through each module, we are only concerned with ABS. After you receive the codes, reply them to this post.
Was this
answer
helpful?
Yes
No
Wednesday, October 13th, 2010 AT 12:33 AM
Tiny
99CADDIE
  • MEMBER
These were the codes I got from the instructions you gave me.
C1217
C1221
C1242
C1243
U1056
I hope this will tell you something so that I can get this problem fix.
Thanks for your help
sorry it took me so long to get back with you I had trouble logging on finally had to call and have them help me.
Mike
Was this
answer
helpful?
Yes
No
Monday, October 25th, 2010 AT 1:53 PM
Tiny
FACTORYJACK
  • EXPERT
3 of the four codes point to the EBCM(brake module), and/or the brake pressure modulator valve. The C1217 is pump motor relay contacts open. That relay is integral to the EBCM. The C1242 1nd 1243 is pump motor open, and pump motor stalled, respectively. The fact that these lights came on after hard braking, was probably the pump was commanded on and was inoperative. There is a ground stud at the end of the pump motor case, and the ground lead connects to the trans housing. Make sure them grounds are tight. I believe you can disconnect the pump leads from the EBCM, and check continuity(resistance). The C1221 code was for LF speed sensor input = 0. With the procedure for reading codes I gave you, you could clear them all. Drive the vehicle until the ABS light comes on, and see which codes return. They will all turn on the indicator.
Was this
answer
helpful?
Yes
No
-1
Monday, October 25th, 2010 AT 9:23 PM
Tiny
99CADDIE
  • MEMBER
What about the Traction Control lite it also is on. If I delete the codes for the ABS will the traction control lite go off also. Or is that intirely different? Tomorrow I will delete the codes and see which one returns. I know that when I did brake hard one time that is when they came on.
Was this
answer
helpful?
Yes
No
Tuesday, October 26th, 2010 AT 10:22 PM
Tiny
FACTORYJACK
  • EXPERT
ABS and Traction control are integrated, both lights will go out.
Was this
answer
helpful?
Yes
No
Wednesday, October 27th, 2010 AT 12:03 AM
Tiny
99CADDIE
  • MEMBER
I cleared all the codes. I then started the car and the lights came back on. So I looked to see which code it was and the only one that came on was C1217. I didn't drive it to see if any others would come on. So what we are looking at is the pump motor relay contacts are open. Now the question is where is the pump motor and how hard is it to change out?
Was this
answer
helpful?
Yes
No
Wednesday, October 27th, 2010 AT 2:04 PM
Tiny
FACTORYJACK
  • EXPERT
As I stated previously, the pump motor is part of the BPMV. The pump motor relay is part of the EBTCM. The two of them are connected together, but serviced seperately. A salvage yard would probably sell them both as a unit of a tenth of the cost new.
Was this
answer
helpful?
Yes
No
Wednesday, October 27th, 2010 AT 8:34 PM

Please login or register to post a reply.

Recommended Guides