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Test 146A - Repairing Headlight Circuit

NOTE: Perform TEST 141A  before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring schematics, see WIRING DIAGRAMS  in this article. Perform TEST VER-3A - VERIFICATION PROCEDURE  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Using scan tool, read key in ignition switch status. If scan tool does not display CLOSED, go to TEST 146C  . If scan tool displays CLOSED and parking lights do not flash, go to TEST 146B  . If scan tool displays CLOSED and parking lights flash, go to next step.
  2. Actuate headlight relay using scan tool. If headlights toggle on and off, replace Body Control Module (BCM). BCM is located behind right kick panel. If headlights do not toggle on and off, turn ignition switch to OFF position. Disconnect BCM Gray connector. Ensure connector is clean and undamaged. Go to next step.
  3. Connect jumper wire between terminal No. 2 (Red/Dark Blue wire) on BCM Gray connector and ground. If headlights come on, replace BCM. If headlights do not come on, disconnect jumper wire. Go to next step.
  4. Remove headlight delay relay. See Figure . Using scan tool in voltmeter mode, measure voltage at terminal "A" (Red/White wire) on headlight delay relay connector. If voltage is 10 volts or less, repair open Red/White wire. If voltage is more than 10 volts, go to next step.
  5. Measure voltage at terminal "C" (Red/White wire) on headlight delay relay connector. If voltage is 10 volts or less, repair open Red/White wire. If voltage is more than 10 volts, go to next step.
  6. Connect jumper wire between terminals "A" (Red/White wire) and "B" (Light Green wire) on headlight delay relay connector. If headlights do not come on, repair open Light Green wire. If headlights come on, disconnect jumper wire and go to next step.
  7. Using an external ohmmeter, measure resistance between terminal No. 2 (Red/Dark Blue wire) on BCM Gray connector and terminal "E" on headlight delay relay connector. If resistance is 5 ohms or greater, repair open Red/Dark Blue wire. If resistance is less than 5 ohms, replace headlight delay relay.
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