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Exterior Lighting Test 2B - Auto Headlights Inoperative

NOTE: Perform EXTERIOR LIGHTING TEST 2A  before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For wiring diagrams, refer to WIRING DIAGRAMS  . After each repair, perform TEST VER-1A  .
CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.
  1. Remove auto headlight relay. Headlight relay is located in junction block, behind right kick panel. Using scan tool in voltmeter mode, measure voltage at terminal No. 30 (Red/Light Blue wire) on headlight relay connector. See Figure .
  2. If voltage is less than 10 volts, repair open in Red/Light Blue wire between terminal No. 30 on headlight relay connector and power distribution center. Power distribution center is located in engine compartment. If voltage is 10 volts or more, go to next step.
  3. Using scan tool in voltmeter mode, measure voltage at terminal No. 86 (Red/Light Blue wire) on headlight relay connector. If voltage is less than 10 volts, repair open in Red/Light Blue wire between headlight relay connector terminal No. 86 and power distribution center. If voltage is 10 volts or more, go to next step.
  4. Turn headlights on. Using scan tool in voltmeter mode, measure voltage at terminal No. 87 (Tan/Black wire) on headlight relay connector. If voltage is less than 10 volts, repair open in Tan/Black wire between headlight relay and headlight switch. If voltage is 10 volts or more, go to next step.
  5. Connect a test light between headlight relay connector terminals No. 85 (Black/Orange wire) and No. 86 (Red/Light Blue wire). Using scan tool, actuate headlight relay. If test light illuminates when headlight relay is actuated, replace headlight relay. If test light does not illuminate when headlight relay is actuated, go to next step.
  6. Stop actuating headlight relay. Connect a jumper wire between terminal No. 85 (Black/Orange wire) on headlight relay connector and ground. Disconnect BCM White 24-pin connector. Using scan tool in ohmmeter mode, measure resistance at terminal No. 12 (Black/Orange wire) on BCM White 24-pin connector. If resistance is more than 5 ohms, repair open in Black/Orange wire. If resistance is 5 ohms or less, replace BCM.
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