Caprice V8-265 4.3L VIN W MFI (1995)
Brake Warning Indicator: Initial Inspection and Diagnostic Overview
Circuit Operation
Voltage is applied to the "BRAKE" Indicator from I/P Fuse #11 when the Ignition Switch is turned to "RUN," "BULB TEST" or "START." The
"BRAKE" Indicator is controlled by any one of three switches: the Brake Pressure Switch, Ignition Switch or Park Brake Indicator Switch.
When the Ignition Switch is turned to "BULB TEST" or "START," CKT 209 is grounded through the Ignition Switch to activate the "BRAKE"
Indicator. When the Brake Pressure Switch is closed, CKT 209 is grounded through the contacts of the Brake Pressure Switch to activate the "BRAKE"
Indicator. CKT 33 is grounded through the Park Brake Switch when the Park Brake is set, to activate the "BRAKE" Indicator.
With the Daytime Running Lamps (DRL) Control Module grounded through CKT 33, the module provides ground to CKT 209, lighting the "BRAKE"
Indicator.
System Diagnosis
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Perform the System Check and refer to the Symptom Table for the appropriate diagnostic procedure(s). See: System Check See: Symptom
Related Diagnostic Procedures/Symptom Table
System Check
Troubleshooting Hints
PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS:
1. Check I/P Fuse Block Fuse #11. If Fuse #11 is open check for a short to ground in CKT 39.
2. Check brake fluid level. If low, refer to Antilock Brake System. See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems
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Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a
continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be
checked by monitoring for a voltage drop with the system operational (under load).
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Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to "General
Troubleshooting Procedures."). See: Diagrams/Diagnostic Aids
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Refer to System Diagnosis. See: System Diagnosis