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 MANUALSBUICK1998REGAL 25TH ANNIVERSARY EDITIONREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3 (ANTI-LOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM - BOSCH 5.3)SYMPTOM TESTSTEST D: TRACTION OFF INDICATOR INOPERATIVE WITH NO DTCS SET (GRAND PRIX)NOTES
1998 Buick Regal 25th Anniversary Edition
Test D: Traction Off Indicator Inoperative With No DTCS Set (Grand PRIX): Notes
1998 Buick Regal 25th Anniversary EditionSECTION Notes
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 Pontiac Grand Prix, 1999 Pontiac Firebird, 1999 Oldsmobile Intrigue, 1999 Chevrolet Camaro, and 1998 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
- Turn ignition on, with engine off. Using scan tool, enter ABS/TCS data list. While monitoring TCS on/off switch status, press and release TCS on/off switch. If switch status changes as switch is pressed and released, go to next step. If switch status does not change as switch is pressed and released, go to step 8) .
- Turn ignition off. Disconnect EBTCM connector C1. Install pinout box and adapter cable to EBTCM harness connector C1. Connect a fused jumper wire between pinout box terminals No. 18 and 15. Turn ignition switch on, with engine off. If TC indicator illuminates, go to next step. If TC indicator does not illuminate, go to step 5) .
- Replace EBTCM.
- Turn ignition off. Disconnect instrument cluster connector. Using DVOM, measure resistance between pinout box terminal No. 18 and instrument cluster connector terminal No. L or A6 (Purple/White wire). If resistance is not 0-5 ohms, go to next step. If resistance is 0-5 ohms, go to step 7) .
- Repair open or high resistance in Purple/White wire between instrument cluster and EBTCM.
- Diagnose instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
- Turn ignition off. Disconnect EBTCM connector C1. Install pinout box and adapter cable to EBTCM harness connector C1. Using DVOM, measure resistance between pinout box terminals No. 17 and 15 while an assistance presses and releases TCS on/off switch. If resistance is not 0-5 ohms, go to next step. If resistance is 0-5 ohms, go to step 4) .
- Repair open or high resistance in Brown/White wire between TCS on/off switch and EBTCM. Also, check for an open in TCS on/off switch.
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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.