The flash-to-pass feature works with the low beams or Daytime Running Lamps (DRL) on or off.
To flash the high beams, pull the turn signal lever toward you momentarily and then release it.
Special Tools (Diagnostic Tools) Engine Control
IllustrationTool Number/DescriptionCH-34730-2CJ-34730-2CInjector Test LampCH-38641-BJ-38641-BDiesel Fuel Quality TesterCH-39021-301J-39021-301Fuel Injector Harness AdapterCH-39021-460J-39021-460Fuel Injector Test AdapterCH-41415-30GE-41415-30J-41415-30Fuel Tank Cap AdapterCH-42960-2J-42960-2Fuel Fla ...