Grand Cherokee 2WD V8-4.7L VIN N (2000)
Turn Signal Flasher: Description and Operation
The combination flasher is a smart relay that functions as both the turn signal system and the hazard warning system flasher. The combination flasher
contains active electronic Integrated Circuitry (IC) elements. This flasher is designed to handle the current flow requirements of the factory-installed
lighting. If supplemental lighting is added to the turn signal lamp circuits, such as when towing a trailer with lights, the combination flasher will
automatically try to compensate to keep the flash rate the same.
The combination flasher is located in the junction block, under the left end of the instrument panel in the passenger compartment. Because of the active
electronic elements within the combination flasher, it cannot be tested with conventional automotive electrical test equipment. If the combination flasher
is believed to be faulty, test the turn signal system and hazard warning system circuits as described. Then replace the combination flasher with a known
good unit to confirm system operation.
The combination flasher cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.
The combination flasher has nine blade-type terminals intended for the following inputs and outputs: fused B(+), fused ignition switch output, left turn
switch sense, right turn switch sense, hazard switch sense, left front turn signal circuit, right front turn signal circuit, left rear turn signal circuit and right
rear turn signal circuit. Constant battery voltage is supplied to the flasher so that it can perform the hazard warning function, and ignition switched
battery voltage is supplied for the turn signal function. However, when the flasher is idle no current is drawn through the module. The unit does not
become active until it is provided a signal ground from the turn signal switch, hazard warning switch or the Body Control Module (BCM).
Combination Flasher
