95 Chevy Blazer ABS bleed function?

Tiny
JERENE
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 162,000 MILES
I have a obd1 vehicle with obd2 connector under the dash, my bidirectional scanner will not communicate with abs system. Is there a connector that will allow my obd2 scanner to communicate with abs system, or does this require a specific scanner?
Monday, December 22nd, 2025 AT 2:51 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,364 POSTS
There is NO adapter that will make a normal OBD-II scanner talk to the ABS on your 1995 Blazer. You need either a GM-capable bi-directional scanner (Tech-1/Tech-2 class) or you must pull ABS flash codes manually.

OPTION 1 - Pull ABS flash codes (most common & reliable)

GM designed ABS codes to be read without a scanner.

ABS Code Retrieval Procedure (1995 Blazer)

Key OFF

Locate ALDL port

Jumper: Pin A (ground) - Pin H (ABS diagnostic)

Turn key ON

ABS light will flash codes

Example: Flash-flash-pause-flash = Code 21

Do NOT jumper random pins - ABS pin is H, not B like engine codes. Please let me know how it goes.
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Tuesday, December 23rd, 2025 AT 10:50 AM
Tiny
JERENE
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  • 3 POSTS
Thanks Ken, this vehicle has the 16 pin connector. Is there still a way to jump pins on this design? Thanks, And Merry Christmas!
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Tuesday, December 23rd, 2025 AT 12:26 PM
Tiny
KEN L
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  • 54,364 POSTS
Merry Christmas! Yep, this can be tricky because you are on the line of obd1 and obd2. Will the scanner work on the engine part of the system? I would check the connector fuse # 7 in the fuse panel under the dash.
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Wednesday, December 24th, 2025 AT 9:54 AM
Tiny
JERENE
  • MEMBER
  • 3 POSTS
Sorry for the delay, (holiday and bonus water line break). Fuse 7 is good, scanner will only connect to air bag system, no engine or abs. My quest is to auto bleed the abs system but I believe the module may be bad. Sensors all test good. Trying to find a reasonable tech 2 scanner to confirm as I don't have a scanner capable of reading obd1, which I have confirmed this vehicle is. Thanks for the help, if there is anything else i'm missing here please let me know. Thanks again!
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Sunday, December 28th, 2025 AT 12:28 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,364 POSTS
You are going in the right direction, it is confusing because you are in the middle of a large production change. Did you try ebay for the scanner? Please let me know what you find.
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Monday, December 29th, 2025 AT 9:38 AM

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