Question about 1995 Jeep Grand Cherokee

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Why do my wipers not have a varible speed any more?

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Motor is bad or your plug as came off. It can be the switch to on the steering column

Posted on Nov 13, 2014

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I have a 2009 gmc sierra, where is the wiper relay location.


The PCB wiper relays are soldered directly to circuit board inside the under hood fuse box.
The windshield wiper/washer switch signal circuits are inputs to the body control module (BCM) and the BCM controls wiper motor low speed operation, washer pump and high speed operation. The windshield wiper/washer switch is provided a low reference from the BCM and each of the switch signal circuits is supplied 12 volts through a resistor and monitored within the BCM. During LOW or INTERMITTENT operation the wiper switch low signal circuit is closed to the low reference circuit through a series of resistors within the switch assembly and the signal circuit voltage monitored by the BCM will depend on the switch contact location to the resistor assembly. During HIGH or WASH operation the high and wash switch signal circuits are closed directly to the low reference circuit within the switch assembly and nearly all the signal circuit voltage will be dropped across the BCM resistors. The BCM controls the wiper motor through the WIPER CONTROL PCB Relay and the WIPER SPEED PCB Relay. During any wiper motor function that uses low speed the BCM supplies the voltage to energize the WIPER CONTROL PCB Relay and battery voltage will be supplied from the WIPER CONTROL PCB Relay through the de-energized WIPER SPEED PCB Relay to the wiper motor low speed control circuit. During high speed wiper motor operation the WIPER CONTROL PCB Relay is energized as in low speed and the BCM provides a ground to energize the WIPER SPEED PCB Relay and the battery voltage is supplied to the wiper motor high speed control circuit. Wiper motor park operation is controlled by the BCM using an input from the park switch within the wiper motor assembly. The BCM supplies the park switch signal circuit 12 volts through a resistor then monitors the circuit. Whenever the wiper motor is out of the park position the park switch signal circuit is closed to ground and nearly all the signal circuit voltage will be dropped across the BCM resistor. When the wiper switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the BCM will continue to operate the motor until the wipers reach the park position. If the ignition is turned OFF while the wipers are in mid-cycle, the wipers will stop immediately where they are and the BCM will park the wipers the next time the ignition is cycled ON.

DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
Have it checked for DTC'S - diagnostic trouble codes .

The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.
Your best bet , take your vehicle to a qualified repair shop or dealer . Hooking up a factory scan tool to see what the wiper switch inputs to the BCM are correct and outputs to relays are good .

Feb 11, 2017 | GMC Cars & Trucks

1 Answer

99 f350 super duty, wipers would only come on sometimes. I changed wiper motor now they still don't work


The generic electronic module (GEM) responds to the windshield wiper control commands by interpreting inputs from the steering column multi-function switch. The speed dependent wipers will compensate for the extra moisture that accumulates on the windshield at higher speeds, except when the multi-function switch is in the INT 1 position. At higher speeds, the speed dependent feature shortens the delay between wipes when using the variable interval wipers. Delays will automatically adjust at speeds between 16 and 105 km/h (10 and 65 mph).
Testing should be done before replacing any parts . And if you don't know about (GEM) Control module controlled system's your best bet , take it to a qualified repair shop . The first place to start trouble shooting these systems is with a scan tool that can read GEM module codes .

B1840 Wiper Front Power Circuit Failure GEM GO to Pinpoint Test B . B1476 Wiper High Speed Circuit Motor Failure GEM GO to Pinpoint Test B . B1473 Wiper Low Speed Circuit Motor Failure GEM GO to Pinpoint Test B .
B1431 Wiper Brake/Run Relay Circuit Failure GEM GO to Pinpoint Test B . B1432 Wiper Brake/Run Relay Circuit Short to Battery GEM GO to Pinpoint Test B . B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure GEM GO to Pinpoint Test D . B1436 Wiper Hi/Low Speed Relay Coil Circuit Short to Battery GEM GO to Pinpoint Test D . B1438 Wiper Mode Select Switch Circuit Failure GEM GO to Pinpoint Test B . B1441 Wiper Mode Select Switch Circuit Short to Ground GEM GO to Pinpoint Test C . B1446 Wiper Park Sense Circuit Failure GEM GO to Pinpoint Test B . B1450 Wiper Wash/Delay Switch Circuit Failure GEM GO to Pinpoint Test E . B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM GO to Pinpoint Test C . B1458 Wiper Washer Pump Motor Relay Circuit Failure GEM GO to Pinpoint Test F . B1460 Wiper Washer Pump Motor Relay Coil Circuit Short to Battery GEM GO to Pinpoint Test F .
If no codes are stored then you go here .
  • The Wipers Are Inoperative
  • Fuse(s).
  • Circuitry.
  • GEM.
  • Multi-function switch (13K359) (wiper/washer switch).
  • Windshield wiper run/park relay.
  • Windshield wiper HI/LO relay.
  • Windshield wiper motor (17508).
  • GO to Pinpoint Test B .

Your best bet , take it to a qualified repair shop that knows how to trouble shoot problems like this . This is no easy diagnose's .

Feb 07, 2017 | Cars & Trucks

1 Answer

How do I find out if the wipers on my 2006 H3 Hummeris on a relay?


The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper micro relay
• Wiper 2 relay
• Wiper diode
• Windshield wiper motor
• Windshield washer pump
• Windshield washer nozzles
• Windshield washer solvent container
• Windshield wiper arm and blade assemblies
• Windshield wiper transmission
• WIP/WASH 10A fuse
• WIPER 25A fuse

Wiper/Washer System Description
The body control module (BCM) controls wiper motor low speed operation. The washer pump and high speed operation are controlled directly by the wiper/washer switch. The windshield wiper/washer switch supplies voltage on the signal circuits to the BCM for windshield wiper/washer operation. When WASH, MIST, DELAY, LOW, or HIGH is detected, the BCM energizes the wiper micro relay by suppling voltage to the relay coil. This allows battery voltage from the WIPER fuse to flow through the relay switched input then through the contacts and out the relay switched output to the wiper 2 relay switch contacts. Since the wiper 2 relay switch contacts are normally closed to the low speed circuit of the windshield wiper motor, the motor will operate at low speed.

Low Speed Operation
When the wiper switch is in the Low position, voltage is supplied through an internal resistor to the signal circuit. The body control module (BCM) monitors the windshield wiper switch signal 1 circuit, and energizes the wiper micro relay which will operate the windshield wiper motor. The wiper motor will operate at low speed, since the wiper 2 relay is de-energized. Low speed can also be commanded with a scan tool, by commanding Wiper Relay Cmd. ON and OFF. Refer to Scan Tool Output Controls .
High Speed Operation
In the High position, the windshield wiper/washer switch supplies voltage to both the wiper micro relay and wiper 2 relay coils. This energizes both relays and allows battery voltage from the wiper micro relay switched output to the switched input of the wiper 2 relay through its contacts and out the switched output of the wiper 2 relay to the high speed circuit of the windshield wiper motor. The windshield wiper motor will operate at high speed. During high speed wiper motor operation the wiper switch signal circuit is at the low speed signal voltage, and the body control module (BCM) supplies redundant voltage to the wiper relay via the wiper diode.

This info is out of hummer factory service manual !

Dec 10, 2016 | 2006 Hummer H3

1 Answer

I'm driving in rain, wipers working good, all of a sudden they quit! I drive for 15 min, check again, they work for a while, then quit again...what in the problem?


If your not familiar with automotive electronics an module control of components , I suggest you take it to the dealer . They have the tools to diagnose this type problem !
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.
High Speed Operation When the wiper switch is in the high speed position, ground is applied through the windshield wiper switch high signal circuit to the body control module (BCM) indicating the wiper high speed request. In response to this signal, the BCM then energizes the wiper PCB relay, as stated above, and the wiper high PCB relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.
Wiper motor high speed operation and the wiper high speed PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
You could Have a switch problem , BCM problem ,PCB relay problem , the pcb relays are non serviceable an the whole under hood fuse box would need to be replaced . Malfunctioning motor bad ground some where etc.....

Dec 20, 2015 | 2008 Chevrolet Impala

2 Answers

What would cause the windshield wipers on my recently purchased Jeep Patriot Sport work on every speed except the high speed. High speed doesn't work at all.


The intermittent switch has a bad contact in it for the high speed, i would say, most likely will have to replace it.

Sep 15, 2014 | 2008 Jeep Patriot Sport

1 Answer

2000 volvo s80 check engine light is on and I'm getting P1330 code


On this car that stands for the varible valve timming unit solenoid has failed now it can be a few things the timming is off or the varible timming hub is bad this is ussally do to sludge, but 90% of the time it is the varible valve timming unit. This is located directlly behind the timming belt. Take off the top cover overtop the engine that has the torx t30 bolts holding it on check the wiring and then replace the variable timming solendiod if the wires are ok.

Hope this helps (remember to rating this free answer).

Oct 04, 2011 | 2000 Volvo S80

2 Answers

Why is the steering hard?


You need to give more specifics. Some systems have varible rate steering which will make the steering tighter at high speeds and lighter at slower speeds.
Or just check your power steering fluid level. If the pump is making a noise or the belt came off that could also be it.

Aug 25, 2011 | Dodge Caravan Cars & Trucks

1 Answer

Is there a procedure to check the wiper motor on 1991 S10 pickup (only 42000 miles), to be sure it is defective and not a wiring problem?


ONLY PROCEDURE FOR WIPER MOTOR IS YOU HAVE 2 SPEEDS THAT WORK SLOW AND FAST SPEED.WIPERS WILL RETRACT TO THE BOTTOM OF HOOD LINE WHEN YOU TURN OFF. WIPERS SHOULD TURN OFF. CHECK WIPER RESERVOIR MAKE SURE ITS FULL AND WIPER WASHER SPRAY FLUID CLEAN WINDSHIELD. IF WIPER MOTOR DO ALL THE ABOVE THEN ITS OKAY.IF WIPER MOTOR WORKS SLOW LOOK FOR BINDING AT WIPER ARM LINKAGE AND PIVOT LUBRICATE LINKAGE AND PIVOT COULD HELP.IF WIPER MOTOR DONT WORK CHECK FOR POOR GROUND OR BLOWED FUSE.WIPER WORK AT ONE SPEED CONTROL SWITCH IS BAD.IF WIPER BLADES STOP WHERE EVER THEY ARE OR FAIL TO TURN OFF UNLESS YOU TURN OFF IGNITION SWITCH WIPER MOTOR LIMIT SWITCH BROKEN.IF WIPERS DONT RETRACT BELOW BOTTOM HOOD LINE LOOK FOR MECHANICAL OBSTRUCTION OR WIPER MOTOR FAULTY.

Nov 14, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

Intermittent blower speeds


pull motor ,check for burned wires onfan and bak of fan speed switch,fan could be the problem un hook fan and conect directley to 12 volts and see if varibles exsist,if so replace fan motor/look for a fan resister if all the other things check out

Jul 03, 2009 | 1999 Chevrolet Suburban

1 Answer

Climate control varible speed fan not working


According to the schematics on your vehicle, it has a "Blower motor control processor" either built in to your controls, or in line between your controls and blower motor. Yo may get real lucky and find some dirty connections in that area, and get away with cleaning & re-connecting, but I wouldn't get my hopes up too high. You may end up replacing the processor, as it regulates fan/blower speed.

Feb 16, 2009 | 2004 Buick LeSabre

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