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Diagnostic Procedure

  1. Turn ignition on. Using scan tool, select ABS DATA LIST. While monitoring stoplight switch on scan tool, apply light pressure on brake pedal. If scan tool indicates ON within 1" (25 mm) of pedal travel, system is currently functioning correctly. See DIAGNOSTIC AIDS  . If scan tool does not indicate ON within 1" (25 mm) of pedal travel, go to next step.
  2. With brake pedal pressure still applied, inspect rear brake lights. If brakes lights are illuminated, go to next step. If brake lights are not illuminated, go to step  4 .
  3. Turn ignition switch to LOCK position. Disconnect EBCM 8-pin and 24-pin harness connectors. Turn ignition switch on. With firm pressure applied to brake pedal, measure voltage between ground and EBCM 24-pin harness connector terminal No. 21 (Green/White wire). If voltage is 10 volts or greater, check for poor terminal contact of Green/White wire a EBCM 24-pin harness connectort terminal No. 21. If connector is okay, replace EBCM. If voltage is not 10 volts or greater, repair Green/White wire for short to ground.
  4. Measure voltage of White/Yellow wire between ground and brake light switch harness connector terminal No. 3 (A/T) or No. 2 (M/T). If voltage is not 10 volts or greater, check for poor terminal contact of White/Yellow wire at terminal No. 10 of instrument panel fuse/relay block 18-pin harness connector. If connector is okay, repair White/Yellow wire for open or short to ground and replace STOP (15-amp) fuse if necessary. If voltage is 10 volts or greater, go to next step.
  5. While applying firm pressure on brake pedal, measure voltage of Green/White wire between ground and terminal No. 1 of brake light switch harness connector. If voltage is not 10 volts or greater, adjust or replace brake light switch as needed. If voltage is 10 volts or greater, repair open circuit in Green/White wire.
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