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DTC 22: Brake Switch Failure

  1. Check brakelights for proper operation while depressing brake pedal. If brakelights operate properly, go to next step. If brakelights do not operate properly, go to step  5.
  2. Turn ignition off. Disconnect EHCU harness connectors. While depressing brake pedal, measure voltage between EHCU 16-pin connector terminals No. 7 (Black wire) and No. 13 (Red wire). If battery voltage is present, go to next step. If battery voltage is not present, repair harness as necessary. After repairs, go to step  7.
  3. Ensure continuity is present between ground and EHCU 16-pin connector terminal No. 7 and ECHU 2-pin connector terminal No. 2. If continuity is present, go to next step. If continuity is not present, repair faulty circuit. After repairs, go to step  7.
  4. Check for poor EHCU harness connections. Repair as necessary. If connections are okay, replace EHCU. After repairs, go to step  7.
  5. Check STOP LIGHT fuse (15-amp). If fuse is open, replace fuse, and then go to step  7. If fuse is okay, go to next step.
  6. Remove brakelight switch and check operation. Repair as necessary. If brakelight switch is okay, repair faulty brakelight switch circuit. After repairs, go to next step.
  7. Reconnect all components. Ensure all component are properly installed. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Verify system operation. See SYSTEM OPERATION CHECK  under TROUBLE SHOOTING.
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