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DTC C0281: Stoplight Switch Always Closed Or Shorted: Diagnosis

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  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Turn ignition on. Using scan tool, select DATA LIST function. Check the status of the stoplight switch while applying and releasing brake pedal. If scan tool indicates switch is closed (pedal not applied) at all times, go to next step. If not, go to step 4)  .
  3. Turn ignition off. Disconnect stoplight switch connector. Turn ignition switch to RUN position. Using scan tool, check status of stoplight switch. If scan tool indicates switch is closed (pedal not applied), go to step 7)  . If not, go to step 8)  .
  4. If scan tool indicates that switch is open (pedal applied) at all times, go to next step. If not, go to step 7)  .
  5. Turn ignition off. Disconnect 10-pin EBCM harness connector. Turn ignition switch to RUN position. Using DVOM, check voltage between ground and terminal "C" of 10-pin EBCM harness connector. If voltage reading is greater than 10 volts, go to next step. If not, go to step 8)  .
  6. Turn ignition off. Reconnect all harness connectors. Turn ignition switch to RUN position. Select DATA LIST function on scan tool. Using scan tool, check status of stoplight switch while applying and releasing brake pedal. If scan tool indicates switch is open (pedal applied) at all times, go to step 9)  . If not, go to next step.
  7. Malfunction is intermittent. See DIAGNOSTIC AIDS.
  8. Repair faulty stoplight switch or open in stoplight switch circuit between EBCM and stoplight switch.
  9. Replace EBCM.
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