95 chevy blazer ABS bleed function?

1995 CHEVROLET BLAZER
162,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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JERENE
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  • 4 POSTS
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?
Dec 22, 2025 at 6:51 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Match diagnostic equipment to the exact vehicle, module and required ABS service function. Follow the applicable bleeding procedure and have braking operation verified after repair.

Guidance references and applicability

2CarPros: Original discussion 1711689 https://2carpros.com/questions/95-chevy-blazer-abs-bleed-function Source for reported history and outcome. Contributor suggestions are not independently confirmed diagnoses. Attachments were not verified. HELLA: ABS/ESP diagnosis https://www.hella.com/techworld/uk/technical/car-electronics-and-electrics/abs-esp-control-units-for-braking-and-driving-dynamics/ General support for suitable diagnostic equipment and system-specific procedures. It does not establish tool coverage or bleeding instructions for the 1995 vehicle.

Read the replies · Discussion summary and reported outcome

AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
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STRAILER
  • ✓Experienced Mechanic
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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.
Dec 23, 2025 at 2:50 AM
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JERENE
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Thanks Ken, this vehicle has the 16 pin connector. Is there still a way to jump pins on this design? Thanks, And Merry Christmas!
Dec 23, 2025 at 4:26 AM
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STRAILER
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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.
Dec 24, 2025 at 1:54 AM
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JERENE
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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!
Dec 28, 2025 at 4:28 AM
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STRAILER
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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.
Dec 29, 2025 at 1:38 AM
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JERENE
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Hi Ken, just wanted to let you know what unfolded. I suspected a faulty abs unit and found an old school OTC Genisys on ebay (What a cool tool for OBD1.5) to confirm. Also found an ABS module on ebay. After installing abs unit and clearing history codes bled, the entire system twice, and everything is as good as ever. Been a long journey with this one, just wanted to say thanks for your time! Happy New Year!
Jan 20, 2026 at 8:05 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,542 POSTS
Happy new year! Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
Jan 21, 2026 at 12:58 AM
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Discussion summary

95 chevy blazer ABS bleed function?

The owner could not access the ABS system on a 1995 Blazer with a 16-pin diagnostic connector and wanted to perform ABS bleeding. The owner later obtained an older OTC Genisys, reported confirming a faulty ABS unit, installed a replacement, cleared history codes and bled the system twice.

Reported outcome: The owner reported that braking operation was restored after the ABS-unit work and bleeding.

The diagnostic findings were not supplied in detail. The early advice describing lettered diagnostic terminals did not match the owner's stated connector and is not reproduced.

Read the original discussion

AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
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