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Test SP-21B Checking Brake Switch Circuits For Shorts

  1. Disconnect and inspect brake switch connector. If connector condition is not okay, repair connector as necessary. Perform VERIFICATION TEST SP-VER  . If connector condition is okay, using DRB-II, read inputs monitor. If DRB-II display shows PRESSED, go to step 3). If DRB-II display does not show PRESSED, go to next step.
  2. Turn ignition switch to OFF position. Disconnect Single Board Engine Controller (SBEC) connector. Place DRB-II in ohmmeter mode. Probe terminal No. 29 (White/Pink wire). If resistance is less than 10 ohms, repair short to ground in White/Pink wire. Perform VERIFICATION TEST SP-VER  . If resistance is more than 10 ohms, replace SBEC. Perform VERIFICATION TEST SP-VER  .
  3. If DRB-II display shows PRESSED in step 1), check brake switch adjustment. If brake switch is not adjusted correctly, adjust brake switch. Perform VERIFICATION TEST SP-VER  . If brake switch is adjusted correctly, replace brake switch. Perform VERIFICATION TEST SP-VER  .
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