Headlight Control Unit
NOTE:
Several different wires have the same color. They have been given a number suffix to distinguish them. For example, Red/Yellow 1 and Red/Yellow 4 are not the same.
Remove the bulkhead panels and disconnect the 18-P connector from the control unit. Test input at the harness pins. See . For terminal identification, see Fig 1 . Check all wires for an open. Replace the control unit if all input and component tests show no problem with connector wiring or components.