My windshield wipers work intermittently. I've replaced the motor and the wiper switch. I've tested power to the switch and it fluctuates but I rarely get the full 12 volts. I've checked the fuses and they seem fine, but when I play with them it sometimes causes the wipers to come one. What else could it be?
Did you check for voltage at the wiper fuse? My info says that fuse is hot all the time. Use a digital multimeter. Everything off, take a reading across battery posts, the generic spec for a full charge is around 12.6 volts. You should get close to same reading at the wiper fuse, hopefully. When checking voltage at the fuse, use chassis ground not the other leg of fuse. There are wiper relays, those are pcb relays, they are soldered into the fuse box, you can't pull them out. Your bcm is also involved with those relays. Your multifunction switch basically tells the bcm you turned on your wipers, then the bcm controls voltage or ground for the relays. You can see wire color for hi and lo speed voltage. Maybe a problem with fuse box or wiring circuit if voltage is low? I hope this was of some help?
Playing with thing's that you have no idea how they work never end's good . The switch is a low voltage input to the BCM - body control module , the BCM energizes two relay's wiper an wiper high to control the wiper motor. These two relay's are PCB relay's
What is a PCB relay?
Printed circuit board (PCB) relays are compact relay devices used for power management in control system designs. which require the relay to be mounted directly on the printed circuit board.
These relay's are inside the under hood fuse box.
I suggest you take your vehicle to a qualified repair shop , need a professional type scan tool to diagnose .
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper PCB relay
• Wiper high PCB relay
• Windshield wiper motor
• Windshield washer fluid pump
• Windshield washer fluid level switch
• WPR fuse 25 A
• WSW fuse 10 A
Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
Wiper motor low speed operation and the wiper PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Scan Tool Output Controls .
Windshield Wiper System Malfunction
Circuit/System Verification
BCM and Wiper Switch Verification
Ignition ON, observe the scan tool BCM Windshield Wiper Switch parameters. The reading should display Off, Intermittent, Low and High while rotating the wiper switch.
? If one or more of the wiper delay parameters are inoperative and the wiper low speed parameter functions, replace the turn signal/multifunction switch.
? If the low speed and/or high speed parameters are inoperative, perform the Multifunction Switch Circuit/System Testing.
Observe the scan tool BCM Wiper Park Switch parameter. The reading should display Active when the wipers are parked and Inactive with the wipers ON or out of the park position.
? If the Wiper Park Switch parameter is always Active or Inactive, perform the Wipers do not Park Circuit/System Testing.
If all wiper position parameters displayed correctly on the scan tool, perform the Wiper Motor Circuit/System Testing.
BCM and Wiper Motor Verification
Ignition ON, command the windshield wiper motor to the off, low speed and high speed modes with a scan tool. The wipers should perform the commanded state.
? If one or more of the commanded states do not work, perform the Wiper Motor tests in Circuit/System Testing and/or Component test.
SOURCE: Windshield Wiper Not Working Properly
Well sure enough all I had to do was replace the circuit board...wish I had done this a couple months ago...it was so easy to do and will now be much easier to drive with being able to see clearly again....
SOURCE: windshield wipers stuck upright when off
This is a commoon problem with what is called the "Park pawl stop". The tab is most likely bent and needs to be re-aligned, then the wipers need to be re-timed. This re-timing can be a little difficult, although the re-aligning of the tab is failry simple.
TechJK
SOURCE: Wipers stop in the middle of windshield when turned off
check to make sure the wipers are at its right angle on the vehicle, loose the nuts and place both wipers close to the bottom of the wind screen
SOURCE: replaced wiper motor but still won't work buzzes
can you move the linkage when you pulled the motor?
SOURCE: I have a 2007 Chevy Impala...when I try to use the
there is a windsheld washer pump in the system
which can be changed out without removing the wiper motor
?€¢
Windshield wiper system module / motor
?€¢
Windshield washer fluid pump
?€¢
Windshield washer fluid level switch
?€¢
Instrument panel cluster (IPC)
?€¢
ACC 15-amp fuse
?€¢
WSW 30-amp fuse
527 views
Usually answered in minutes!
×