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 A034: BRAKE SWITCH SHORTED
1990 Pontiac Grand Prix STE, 3.1 V
Code A034: Brake Switch Shorted
1990 Pontiac Grand Prix STE, 3.1 VSECTION Code A034: Brake Switch Shorted
When brake pedal is applied, the brake switch closes. This causes voltage application from STOP fuse to the anti-lock brake controller and brakelights. To set Code A034, the following conditions must occur.
- Anti-lock brake controller senses battery voltage at terminal 1C11 at speeds greater than 25 MPH.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Verifies short still exists (brakelights on).
- Isolates short to battery in circuit No. 20 or brake switch.
- If Code A034 is consistent and brake switch and circuit are okay, anti-lock brake controller must be defective.
- Determines if code is intermittent.
NOTE:
INTERMITTENTS is located under DIAGNOSIS & TESTING.
RENDER: 1.0x
NO RELATED
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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.