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Dome Switch Input Open

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition on. With the DRBIII®, clear all BCM DTC's. Turn the Dome Lamps on. With the DRBIII®, read the DTC information. If the DRBIII® displays: DOME SWITCH INPUT OPEN, go to the next step. If the DRBIII® does not display: DOME SWITCH INPUT OPEN, the condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  2. Turn the ignition off. Disconnect the Body Control Module C5 harness connector. See Figure. Disconnect the Headlamp Switch harness connector. See Figure. Measure the resistance of the Panel Lamps Dimmer Signal Circuit. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the Panel Lamps Dimmer Signal Circuit for an open condition.
  3. Turn the ignition off. Disconnect the Body Control Module C5 harness connector. See Figure. Measure the voltage of the Panel Lamps Dimmer Signal circuit. If the voltage is below 4.8 volts, replace the Body Control Module. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If the voltage is above 4.8 volts, replace the Headlamp Switch. See ANALOG INSTRUMENT PANELS article.
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