Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGCODE A001: ANTI-LOCK WARNING INDICATOR OPEN OR SHORTED TO GROUND
1990 Pontiac Grand Prix STE, 3.1 V
Code A001: Anti-Lock Warning Indicator Open Or Shorted To Ground
1990 Pontiac Grand Prix STE, 3.1 VSECTION Code A001: Anti-Lock Warning Indicator Open Or Shorted To Ground
As the front enable relay is energized, the contacts close and the ground path from the ANTI-LOCK warning indicator is opened. To set Code A001, the following conditions must occur.
- Front enable relay is energized.
- ANTI-LOCK warning indicator control is open.
- Anti-lock brake controller senses no voltage at terminal 1D14.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- The G106 circuit from indicator to ground is good if the ANTI-LOCK warning indicator illuminates.
- Energize front enable relay to determine if circuit No.852 to anti-lock brake controller is functional.
- Voltage at 1D14 indicates circuit No. 852 is functional.
- This establishes whether malfunction is open or short to ground.
- Isolates ANTI-LOCK warning indicator to determine if short is in circuit No. 852 or anti-lock brake controller is defective.
- Check for short to ground in circuit No. 39.
- Determines whether open is in circuit No. 852 or circuit No. 39.
NOTE:
To diagnose intermittent fault, see INTERMITTENTS under DIAGNOSIS & TESTING.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.