2003 Z4. Where is the windshield wiper relay?

Do you know how to test automotive electrical circuit's using a DVOM - digital volt ohmmeter ? Do you know what a wiring diagram is an how to read one ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size. Under system click on body & accessories ,then under subsystem click on wiper/ washer's . Click the search button then the blue link.

Windshield Wiper/Washer System Components
The windshield wiper/washer system consists of the following components:
• Windshield wiper/washer switch
• Windshield wiper motor
• Windshield washer pump
• Windshield washer relay
• Outside moisture sensor
• FRT WIPER 25A fuse
• W/S WASH 15A fuse
Windshield Wiper/Washer System Operation
Accessory voltage and ground is supplied to the windshield wiper motor and provides the power for operating the wiper motor and logic power to the wiper motor module. The WASH, MIST, LOW, and DELAY modes are controlled by the windshield wiper/washer switch through a series of internal resistors. The windshield wiper switch supply voltage circuit is a 12-volt reference from the wiper motor module to the wiper/washer switch, and the switch position determines the point on the resistor assembly where the reference voltage is applied. The windshield wiper switch signal 1 circuit supplies the voltage from the resistor assembly to the wiper motor module and the signal voltage determines the operating mode. High speed operation is controlled by the windshield wiper/washer switch through the windshield wiper switch high signal circuit. The windshield wiper switch high signal circuit is supplied 12 volts by the wiper motor module and when the wiper/washer switch is turned to the HIGH position the windshield wiper switch high signal circuit is grounded through the switch ground circuit. The windshield washer pump is controlled through the windshield wash relay. The windshield wash relay coil and switch is supplied battery positive voltage, and during WASH mode the wiper motor module grounds the washer relay control circuit energizing the relay. When the relay is energized battery positive voltage to the switch side of the relay is supplied to the washer pump control circuit.

The is the symptom of a defective wiper switch.

There are two relay's in the under hood fuse / relay box . Wiper relay an wiper relay 2 . Maybe one is bad . also check fuse #14 25 amp. Wiper fuse.Plus the BCM - body control module has a hand in making the wipers work . Are you familiar with automotive electronic control modules ?
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.

Do you have any speed !

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 !

Have you done a Probe Test on the vehicle? A Probe Light Tester can help you locate a short in your cars electrical system. To learn what a Probe Tester is and How to use it, watch the following video: https://www.youtube.com/watch?v=tXzKcEyIOq8

WINDSHIELD WIPERS

It can be faulty wiper motor or blown wiper control fuse.

Do you hear any kind of noise when you starter the wiper function. If yes then fuse is ok, but issue is wiper motor.

If no movement at all and no noise then its blown fuse or shorted/loose wiper control wiring: -----

For complete troubleshooting i suggest you few helpful links with accurate solutions.

-------------

Click the link below: -------

1993 Ford F350 wipers not working?

http://repairhelpcenter.blogspot.in/2012/02/1993-ford-f350-wipers-not-working.html

------------

How to Replace a Windshield Wiper Motor

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-windshield-wiper-motor.html

------------

Wipers not working, but hear relay click on Lincoln LS?

http://schematicsdiagram.blogspot.com/2011/12/wipers-not-workingbut-hear-relay-click.html

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Car windshield wiper gets power for movement and stops?

http://schematicsdiagram.blogspot.com/2011/12/car-windshield-wiper-gets-power-for.html

----------

How does cars Windshield Wiper System Works

http://technoanswers.blogspot.com/2011/11/how-does-cars-windshield-wiper-system.html

---------

1997 Honda Protege: Replace Wiper Transmission?

http://technoanswers.blogspot.in/2012/06/1997-honda-protege-replace-wiper.html

----------------

Windshield wiper fluid container leaking?

http://whatisbyme.blogspot.in/2012/05/windshield-wiper-fluid-container.html

-----------------

Where is wiper fuse located on1993 chevrolet suburban

http://technoanswers.blogspot.in/2012/02/where-is-wiper-fuse-located-on1993.html

------------

2002 Toyota Sienna: Wipers and Passenger side Power window stopped working?

http://technoanswers.blogspot.in/2012/04/2002-toyota-sienna-wipers-and-passenger.html

-------------

Complete wiper components replacing details for Acura Car Models?

http://repairhelpcenter.blogspot.com/2011/11/complete-wiper-components-replacing.html

------------

These details will help.

Thanks.

It can be faulty wiper motor or blown wiper control fuse.

Do you hear any kind of noise when you starter the wiper function. If yes then fuse is ok, but issue is wiper motor.

If no movement at all and no noise then its blown fuse or shorted/loose wiper control wiring:-----

For complete troubleshooting i suggest you few helpful links with accurate solutions.

-------------

Click the link below:-------

1993 Ford F350 wipers not working?

http://repairhelpcenter.blogspot.in/2012/02/1993-ford-f350-wipers-not-working.html

------------

How to Replace a Windshield Wiper Motor

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-windshield-wiper-motor.html

------------

Wipers not working, but hear relay click on Lincoln LS?

http://schematicsdiagram.blogspot.com/2011/12/wipers-not-workingbut-hear-relay-click.html

-----------

Car windshield wiper gets power for movement and stops?

http://schematicsdiagram.blogspot.com/2011/12/car-windshield-wiper-gets-power-for.html

----------

How does cars Windshield Wiper System Works

http://technoanswers.blogspot.com/2011/11/how-does-cars-windshield-wiper-system.html

---------

1997 Honda Protege: Replace Wiper Transmission?

http://technoanswers.blogspot.in/2012/06/1997-honda-protege-replace-wiper.html

----------------

Windshield wiper fluid container leaking?

http://whatisbyme.blogspot.in/2012/05/windshield-wiper-fluid-container.html

-----------------

Where is wiper fuse located on1993 chevrolet suburban

http://technoanswers.blogspot.in/2012/02/where-is-wiper-fuse-located-on1993.html

------------

2002 Toyota Sienna: Wipers and Passenger side Power window stopped working?

http://technoanswers.blogspot.in/2012/04/2002-toyota-sienna-wipers-and-passenger.html

-------------

Complete wiper components replacing details for Acura Car Models?

http://repairhelpcenter.blogspot.com/2011/11/complete-wiper-components-replacing.html

------------

These details will help.

Thanks.

For wiper problem,troubleshooting,check the help links provided below.Click the link to go through its procedure:----------------
HOW TO REPLACE A WINDSHIELD WIPER MOTOR

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-windshield-wiper-motor.html

---------
Wipers not working, but hear relay click? http://schematicsdiagram.blogspot.com/2011/12/wipers-not-workingbut-hear-relay-click.html--------- Car windshield wiper gets power for movement and stops?

http://schematicsdiagram.blogspot.com/2011/12/car-windshield-wiper-gets-power-for.html

-----------------
How does cars Windshield Wiper System Works

http://technoanswers.blogspot.com/2011/11/how-does-cars-windshield-wiper-system.html


------------
Where is wiper fuse located?

http://technoanswers.blogspot.in/2012/02/where-is-wiper-fuse-located-on1993.html


-----------
Complete wiper components replacing details for Car Models? http://repairhelpcenter.blogspot.com/2011/11/complete-wiper-components-replacing.html The wipers not working? http://repairhelpcenter.blogspot.in/2012/02/1993-ford-f350-wipers-not-working.html

fuse panel in car on driver side by left knee under dash


Visual Inspection Chart
Mechanical Electrical

• Wiper linkage
• Washer nozzles
• Washer pump hoses

• Central junction box (CJB) Fuse 211 (15A), Fuse 215 (30A)
• Multifunction switch
• Rear window wiper switch
• Wiper run/park relay
• Wiper high/low relay
• Windshield wiper motor
• Windshield washer pump
• Rear window washer pump
• Circuitry
• Battery junction box (BJB)
• CJB
• Generic electronic module (GEM)

It is actually a wiper control module that controls this. I have replaced many of them. It is the cover that is screwed to the wiper gear box. Remove both wiper arms. Remove the plastic cowl cover below the windshield that covers from side to side. Once inside you will see the wiper motor/transmission assy. Disconnect the electrical connector, and remove screws from cover, and replace it.