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Test NTC-3: Checking Brake Switch

NOTE: For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2  to ensure system is functioning properly. Ensure no DTCs are present before performing this test.
  1. Turn ignition on with engine off. Using scan tool in INPUTS/OUTPUTS mode, read brake switch state while depressing and releasing brake pedal several times. If scan tool does not display PRESSED and released, go to next step. If scan tool displays PRESSED and released, brake switch is operating properly. Test is complete.
  2. Using scan tool, check for DTCs. If any speed control related DTCs are present, repair those DTCs before continuing with this test. In no speed control DTCs are present, start engine. Turn speed control main switch on. Using a test light connected to ground, backprobe Dark Blue/Red wire at brakelight switch harness connector. Test light should be on with brake pedal released and off with brake pedal pressed. If test light operates as specified, go to next step. If test light does not operate as specified, adjust or replace brakelight switch.
  3. Turn ignition off. Using test light connected to ground, backprobe terminal No. 6 (Pink/Dark Blue wire) at brakelight switch harness connector. See Figure. If test light is illuminated, go to next step. If test light is not illuminated, check for open in Pink/Dark Blue between brakelight switch and fuse No. 20 (20-amp) at junction block. Junction block is located behind end cover on left side of instrument panel. Repair wiring as necessary. Also check fuse No. 20. Replace fuse as necessary.
  4. With test light connected to ground, backprobe terminal No. 5 (White/Tan wire) at brakelight switch harness connector with brake pedal pressed. If test light is illuminated, no problem is indicated at this time. Test is complete. If test light is not illuminated, adjust or replace brakelight switch.
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