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Key Unlock Warning Switch

  1. Disconnect key unlock warning switch 4-pin connector. Check for continuity between key unlock warning switch terminals No. 1 and 2. See Fig 1. Continuity should exist with ignition key in switch. Continuity should not exist with ignition key removed from switch. If continuity is as specified, go to next step. If continuity is not as specified, replace key unlock warning switch.
  2. Reconnect key unlock warning switch connector. Using ohmmeter positive lead, backprobe key unlock warning switch connector terminal No. 2. Connect negative ohmmeter lead to ground. Continuity should exist with ignition key in switch. Continuity should not exist with ignition key removed from switch. If continuity is as specified, go to next step. If continuity is not as specified, inspect and repair wiring harness as necessary.
  3. Using ohmmeter positive lead, backprobe key unlock warning switch connector terminal No. 1. Connect negative ohmmeter lead to ground. Continuity should exist at all times. If continuity is not as specified, inspect and repair wiring harness as necessary.
Fig 1: Identifying Key Unlock Warning Switch Terminals
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