Washer Pump/Motor: Operation

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

The washer pump/motor unit features a small Direct Current (DC) electric motor. The motor is connected to the vehicle electrical system through a single take out and two-cavity connector of the headlamp and dash wire harness. The motor is grounded at all times through a take out of the headlamp and dash wire harness with a single eyelet terminal connector that is secured by a nut to a ground stud located on the right front fender inner shield in the engine compartment. The motor receives battery current on a front washer pump/motor control circuit.

The front washer pump/motor control circuit is energized by the Central Timer Module (CTM) whenever the CTM receives an input through the closed contacts of the momentary washer switch within the multi-function switch. Washer fluid is gravity-fed from the washer reservoir to the inlet side of the washer pump. When the pump motor is energized, the motor spins the rotor within the washer pump. The spinning pump rotor pressurizes the washer fluid and forces it through the pump outlet nipple, the washer plumbing, and the washer nozzles onto the windshield glass.

The washer pump/motor unit may be diagnosed using conventional diagnostic tools and methods. However, conventional diagnostic methods may not prove conclusive in the diagnosis of the CTM. The most reliable, efficient, and accurate means to diagnose the CTM related to the washer pump/motor unit operation requires the use of a DRBIII(R) scan tool. Refer to the appropriate diagnostic information.