AC - Headlamps On Continuously
Pinpoint Test AC: Headlamps On ContinuouslyNOTE: Ford DOES NOT provide a procedure to perform the following pinpoint test without the Rotunda New Generation Star (NGS) tester 007-00500 or equivalent.
AC1 - Test Headlamps
- Turn headlamp switch OFF.
Are headlamps or park lamps on?
YES
NO
AC2 - Test Headlamp Switch
- Connect New Generation Star (NGS) Tester to DLC.
- Request lighting control module headlamp switch position PID HDLMPSW.
Does PID indicate switch is in headlamp or park lamps position?
YES SERVICE headlamp switch for stuck switch or headlamp switch circuit 1033 (R/Y) for short to B+. RETEST system.
NO GO to AC3.
AC3 - Test Headlamps Output
- Disconnect connector C3 from lighting control module.
Does headlamps or park lamps remain on?
YES Test daytime running lamps system (Canadian vehicles only). SERVICE headlamps or park lamps output for short to B+. RETEST system.
NO REPLACE lighting control module. RETEST system.
AC4 - Test Autolamps
- With ignition switch OFF, cover light sensor amplifier.
- Turn autolamp switch on.
- Wait 15 seconds.
Do headlamps and autolamp indicator turn on?
YES GO to AC5.
NO GO to AC7.
AC5 - Test Ignition Switch
- Connect NGS tester or equivalent to data link connector.
- Request PID IGN_LCM.
Does ignition switch status read RUN or START?
YES GO to AC6.
NO REPLACE lighting control module. RETEST system.
AC6 - Test Ignition Switch PID Status
- Disconnect lighting control module connector C2.
- Request ignition switch status PID IGN_LCM.
Does ignition switch status read RUN or START?
YES REPLACE lighting control module. RETEST system.
NO SERVICE ignition RUN/START input to lighting control module circuit 1003 (GY/Y) Town Car or 640 (R/Y) Crown Victoria, Grand Marquis for short to B+. RETEST system.
AC7 - Test Autolamps
- Turn ignition switch to RUN.
Do headlamps and autolamp indicator turn on?
YES GO to Pinpoint Test AE. AE - Flash-To-Pass Inoperative
NO GO to Pinpoint Test AA. AA - No Communication With Lighting Control Module