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Dimming Level Switch Failure

NOTE: Perform INSTRUMENT CLUSTER TEST 1A  before proceeding with this test. For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION. Perform VERIFICATION TEST: VER-2A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Access Body Control Module (BCM) Black 24-pin connector C2. BCM is mounted to junction block located behind left end cap of instrument panel. See Figure.
  2. Disconnect BCM Black 24-pin connector. Using external voltmeter, measure voltage between ground and terminal No. 19 (White wire) on BCM Black connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair White wire for short to voltage.
  3. Using external ohmmeter, measure resistance between ground and terminal No. 19 (White wire) on BCM Black connector. If resistance is less than 5 ohms, repair White wire for short to ground. If resistance is 5 ohms or greater, go to next step.
  4. Using external voltmeter, measure voltage between ground and terminal No. 21 (Red wire) on BCM Black connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair Red wire for short to battery voltage.
  5. Using external ohmmeter, measure resistance between ground and terminal No. 21 (Red wire) on BCM Black connector. If resistance is less than 5 ohms, repair Red wire for short to ground. If resistance is 5 ohms or greater, go to next step.
  6. Disconnect headlight switch connector. Using external ohmmeter, measure resistance between terminals No. 19 and 21 on BCM Black connector. If resistance is less than 5 ohms, repair short between White wire and Red wire. If resistance is 5 ohms or greater, go to next step.
  7. Using external ohmmeter, measure resistance of White wire between terminal No. 19 on BCM Black connector and terminal No. 6 on headlight switch harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open White wire.
  8. Using external ohmmeter, measure resistance of Red wire between terminal No. 21 on BCM Black connector and terminal No. 3 on headlight switch harness connector. If resistance is less than 5 ohms, replace headlight switch. If resistance is 5 ohms or greater, repair open Red wire.
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