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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGCODE A040: REAR ENABLE RELAY CONTACTS SHORTED TO BATTERY
1990 Pontiac Grand Prix STE, 3.1 V
Code A040: Rear Enable Relay Contacts Shorted To Battery
1990 Pontiac Grand Prix STE, 3.1 VSECTION Code A040: Rear Enable Relay Contacts Shorted To Battery
When rear enable relay control is open, the rear enable relay is de-energized. This blocks voltage application to the rear solenoid and solenoid control. To set Code A040, the following conditions must occur.
- Rear enable relay control does not energize.
- Anti-lock brake controller senses voltage at terminal 1D12, at both terminals 1C14 and 1C15.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- If Code A039 is set, replace anti-lock brake controller.
- Isolates short to battery in wire harness or anti-lock brake controller.
- Isolates a short to battery in circuit No. 961, or a defective rear enable relay.
- If Code A040 is consistent, the anti-lock brake controller has internal malfunction.
NOTE:
INTERMITTENTS is located under DIAGNOSIS & TESTING.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.