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 MANUALSCHEVROLET1997FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - P SERIESSYMPTOM TESTSTEST A: ANTI-LOCK LIGHT DOES NOT ILLUMINATE - NO DTCSDIAGNOSTIC PROCEDURES
1997 Chevrolet Forward Control 5.7 R, Automatic
Diagnostic Procedures
1997 Chevrolet Forward Control 5.7 R, AutomaticSECTION Diagnostic Procedures
- Perform Diagnostic System Check. If diagnostic system check has been performed, go to next step. If not, go to DIAGNOSTIC SYSTEM CHECK .
- Turn ignition off. Disconnect 10-pin EBCM harness connector. Using a fused jumper wire, jumper terminal "B" of 10-pin harness connector to ground. Turn ignition switch to RUN position. If ANTI-LOCK indicator light illuminates, go to next step. If not, go to step 4).
- Inspect 10-pin EBCM harness connector for damage or corrosion. If connector is okay, go to step 9). If connector is not okay, go to step 8).
- Inspect jumper wire fuse. If fuse is blown, go to step 10). If fuse is okay, go to next step.
- Inspect 10-amp GAUGE fuse. If fuse is blown, go to next step. If fuse is okay, go to step 7).
- Turn ignition off. Replace fuse. Turn ignition switch to RUN position. Remove and inspect GAUGE fuse. If fuse is blown, go to step 13). If fuse is okay, go to step 14).
- Remove and inspect ANTI-LOCK indicator light bulb. If bulb is okay, go to step 12). If bulb is faulty, go to step 11).
- Repair 10-pin EBCM harness connector. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
- Replace EBCM. After replacing EBCM, perform DIAGNOSTIC SYSTEM CHECK .
- Repair short to voltage in ANTI-LOCK indicator light circuit between EBCM and instrument cluster. See WIRING DIAGRAMS . After repairs, perform DIAGNOSTIC SYSTEM CHECK .
- Replace ANTI-LOCK indicator light bulb. After replacing light bulb, perform DIAGNOSTIC SYSTEM CHECK .
- Repair open in circuit between fuse block and instrument cluster, or ANTI-LOCK indicator light control circuit between instrument cluster and EBCM. See WIRING DIAGRAMS . After repairs, perform DIAGNOSTIC SYSTEM CHECK .
- Repair short to ground in brake warning light control circuit between instrument cluster and EBCM. See WIRING DIAGRAMS . After repairs, perform DIAGNOSTIC SYSTEM CHECK .
- Problem is an intermittent short to ground in brake warning light control circuit between instrument cluster and EBCM. See WIRING DIAGRAM. Repair as necessary. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
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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.