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DTC 14: Stoplight Switch

WARNING: This page is about a different car, the 2001 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Measure voltage between stoplight switch connector terminal No. 3 and ground. If battery voltage is present, go to step  3 . If battery voltage is not present, go to next step.
  2. Disconnect brakelight switch electrical connector. Using an ohmmeter, check continuity between switch terminals No. 3 and 4. Continuity should exist when plunger is released. Continuity should not exist when plunger is depressed 0.2" (4 mm). If continuity is not as specified, replace brakelight switch. If DTC is still present, go to step  5 .
  3. Check vacuum pump. See VACUUM PUMP TEST  under COMPONENT TESTS. Replace vacuum pump as necessary.
  4. Turn ignition on. Using a DVOM, backprobe ECU harness connector between ground and terminals No. 7, 8 and 16. If battery voltage is present at all three terminals, replace cruise control ECU. If battery voltage is not present, go to next step.
  5. Check circuit between brakelight switch, vacuum pump and ECU. Repair as required. If circuit is okay, replace cruise control ECU.
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