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Exterior Light Test 9A - Auto Headlights Will Not Turn Off

NOTE: Perform EXTERIOR LIGHT TEST 1A  before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For wiring diagrams, refer to WIRING DIAGRAMS  . Perform, after each repair, VERIFICATION TEST VER-1A - VERIFICATION PROCEDURE  .
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using scan tool, select BODY, BODY COMPUTER, then SENSORS. Read AUTO HEADLAMP SENS VOLTS. If voltage reading is 0.6-4.8 volts, replace Body Control Module (BCM). BCM is located with junction block under driver's side instrument panel. See Figure . If voltage reading is not 0.6-4.8 volts, go to next step.
  2. Disconnect BCM "B" connector. Connect jumper wire between ground and terminal No. 51 (White/Light Green wire) on "B" connector. Disconnect interior electrochromic mirror connector. Using external ohmmeter, measure resistance between ground and terminal No. 7 (White/Light Green wire) on mirror harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open White/Light Green wire.
  3. Remove jumper wire. Using external ohmmeter, measure resistance between ground and terminal No. 7 (White/Light Green wire) on mirror harness connector. If resistance is less than 1000 ohms, repair White/Light Green wire for short to ground. If resistance is 1000 ohms or greater, replace mirror.
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