B1577 - Park Lamp Input Short To Battery (+)

DTC B1577: Park Lamp Input Short To Battery (+)

NOTE: Ford DOES NOT provide a procedure to perform the following pinpoint test without the Rotunda New Generation Star (NGS) tester 007-00500 or equivalent.

B1577-1 - Check Self Test

- Turn headlamp switch OFF.
- Repeat self test.

Is DTC 1577 retrieved during self test?

YES GO to B1577-2.
NO Headlamp switch was left in HEAD position during self test diagnostics. GO to next DTC.

B1577-2 - Check PID

- Access and disconnect headlamp switch.
- Access lighting control module PID PARK_SW.

Does PID indicate switch ON?

YES GO to B1577-3.
NO REPLACE headlamp switch. RESTORE vehicle. RETEST system.

B1577-3 - Check Circuit 1032 (W/BK)

- Access and disconnect lighting control module connector C1.
- Using a voltmeter connected to good ground, measure voltage at pin C1-13.

Is battery voltage present?

YES SERVICE short to battery in circuit 1032 (W/BK). RESTORE vehicle. RETEST system.
NO REPLACE lighting control module. RESTORE vehicle. RETEST system.