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Test 48A - Headlight & Parking Lamps Inoperative In Auto Mode

NOTE: Perform TEST 47A  before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring schematics, see WIRING DIAGRAMS  in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Turn headlight switch on. If headlights do not illuminate, repair headlights as necessary. If headlights illuminate, go to next step.
    NOTE: TEST 2A through TEST 24A are related to Automatic Temperature Control (ATC) system. For automatic A/C-heater system test procedures, see A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT section.
  2. Turn headlight switch off. Using scan tool, read DTCs. See DIAGNOSTIC PROCEDURE  . If scan tool displays ATC SUN LOAD SENSOR FAILURE, go to TEST 14A in A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT section. If scan tool does not display ATC SUN SENSOR LOAD FAILURE, go to next step.
  3. Using scan tool, actuate headlight relay. If headlights do not toggle on and off, go to step 7). If headlights toggle on and off, go to next step.
  4. Using scan tool, stop headlight relay actuation. Turn headlight switch to "A" position. Using scan tool, read AUTO headlight status. If scan tool displays AUTO HEADLIGHT STATE: ON, go to TEST 48B  . If scan tool does not display AUTO HEADLIGHT STATE: ON, go to next step.
  5. Ensure headlight switch is in "A" position. Remove headlight switch from dash. Leave headlight switch connectors connected. Using scan tool in voltmeter mode, measure voltage at terminal No. 1 (Yellow wire) on headlight switch 8-pin connector. If voltage is 10 volts or less, replace headlight switch. If voltage is more than 10 volts, go to next step.
  6. Turn ignition off. Disconnect Body Control Module (BCM) Black connector. BCM is located behind right kick panel. Ensure headlight switch is in "A" position. Using scan tool in voltmeter mode, measure voltage at terminal No. 11 (Yellow wire) on BCM Black connector. If voltage is 10 volts or less, repair open Yellow wire. If voltage is more than 10 volts, replace BCM.
  7. Using scan tool, stop headlight relay actuation. Turn ignition off. Disconnect Body Control Module (BCM) Gray connector. BCM is located behind right kick panel. Connect jumper wire between ground and terminal No. 2 (Red/Dark Blue wire) on BCM Gray connector. If headlights illuminate, replace BCM. If headlights do not illuminate, go to next step.
  8. Disconnect jumper wire. Disconnect headlight delay relay from junction block. See Figure . Junction block is located behind end cover, on left side of instrument panel. Using scan tool in voltmeter mode, measure voltage at terminal "A" (Red/White wire) on headlight delay relay socket. If voltage is 10 volts or less, repair open Red/White wire. If voltage is more than 10 volts, go to next step.
  9. Using scan tool in voltmeter mode, measure voltage at terminal "C" (Red/White wire) headlight delay relay socket. If voltage is 10 volts or less, repair open Red/White wire. If voltage is more than 10 volts, go to next step.
  10. Connect jumper wire between terminals "A" (Red/White wire) and "B" (Light Green wire) on headlight delay relay socket. If headlights do not illuminate, repair open Light Green wire. If headlights illuminate, go to next step.
  11. Disconnect jumper wire. Using an external ohmmeter, measure resistance between terminal "E" on headlight delay relay socket and terminal No. 2 (Red/Dark Blue wire) on BCM Gray 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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