Which is the relay for the headlamp washers and where is it?

You find a wiring diagram an use a DVOM -digital volt ohmmeter an test the electrical circuit for that headlamp. Is the fuse for that lamp good ?

For low beam operation, battery positive voltage is applied at all times to the coil and switch side of the low beam relay in the underhood fuse block. Ground is applied at all times from G202 to the headlamp switch. When the headlamp switch is placed in the HEAD position, ground is applied to the headlamps ON signal circuit to the body control module (BCM). When either the headlamp switch is placed in the HEAD position or ALC is enabled, the BCM applies a ground to the low beam relay control circuit. This energizes the relay and applies battery positive voltage to the LEFT and RIGHT low beam fuses in the underhood fuse block. Battery positive voltage is then applied from the fuses through the headlamp supply voltage circuit to the headlamps. Ground is applied at all times to the left headlamp from G101 and to the right headlamp from G100.

https://www.youtube.com/watch?v=efKoWifdcag&t=2171s

My database only shows one wiper motor. Did you check voltage and ground, anywhere? Check the wiper fuse for voltage, hot all the time, use test light. At the wiper motor, dark green wire is voltage for lo speed. The purple wire is voltage for hi speed, Turn on key, turn on wiper switch, probe those two wires for voltage, use a test light. That bottom black wire off wiper motor, in diagram, is ground, check that also. If good voltage and ground with no wiper action, I suspect the wiper motor. There are codes for wiper, manufacturer codes, check for codes. good luck

The washer fuse should have power (battery voltage) while the ignition switch is in the RUN position. Verify both sides of the fuse have power. If the rear wash functions them it's not the fuse.

The switch signals the Body Control Module (BCM). The BCM energizes the front washer relay.

Input to BCM from switch is BCM connector C1,24 PK. Output from BCM to relay is connector C4 15 OG.

You need to verify continuity from the the switch to the BCM and from the BCM to the relay.

Comment below for further assistance.

The schematic shows that you have a relay and a fuse located in the fusebox under the hood (as opposed to the fusebox that is located in the side of the drivers dash).
The problem seems to be that the washer pump shares the relay with the headlamps and the fuse.
If your washer pump isn't working but your headlamps are, your washer pump is probably shot and you need a trip to the autoparts store (probably $20 bucks and 30 minutes to fix).
Here is a shot of what should be your under-hood fusebox:

Just replacing parts isn't the way to fix this problem , viewing wiring diagrams too see what all is involved in making the wipers work is . Then using a digital volt ohmmeter to test electrical circuits . Also looking at factory service info. to see how it's suppose to work.
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 . Click the search button ,then click the blue link. Looking at the wiring diagram i see two fuse's an two relays that are controlled by the BCM - body control module . Also hooking up a scan tool that can read BCM DTC'S - diagnostic trouble codes could be helpful . The wiper switch is a input to the BCM - the BCM will energize the relays to turn on the wipers.

Wiper/Washer System Components
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper 1 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
• WIPER/SW 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 1 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 contacts 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.

DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3715 05: Front Wiper Relay Drive Circuit Short to Battery or Open

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 !

WPR fuse 25amp under hood fuse box .
Wiper/Washer System Components
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
This is more then likely not a fuse issue !!!!!!!
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 Control Module References.
The PCB relays mentioned above are soldered right into the circuit board inside the fuse/relay block under the hood . There are alot of reasons for the wipers not to work ! The fuse could be blown but fuse's don't just blow for no good reason , short to ground , low resistance high current flow etc.... Intermittant !

Power and Grounds
With the ignition in the ON position, accessory voltage is supplied through the 25A WPR fuse to the WIPER PCB relay, the WIPER HIGH PCB relay and the WS WASH PCB relay that are all located in the underhood fuse block. Refer to Wiper/Washer Schematics.
G200 provides ground for the windshield wiper motor and the WIPER PCB relay. G100 provides ground for the windshield washer fluid pump and the windshield washer fluid level switch.

In the instrument panel fuse block is a fuse marked PK LAMPS the fuse directly above is a 10 amp fuse ,this is the one you want to check. There is also a relay involved in making the park lights work and the Body control module .The relay is in the same fuse block as the PK LAMP fuse, marked PK LP . Not to sound like I'm talking down to you but do you know what a relay looks like ? The fuse block is Right side of the I/P, behind the access panel. Open the passenger door , at end of the Dash is a panel ,pull it off ,then you'll see fuse box .On the inside of the panel it tells what each fuse and relay is. I'm going add how the park lights work description.
The PARK LAMPS fuse in the instrument panel (I/P) fuse block applies battery positive voltage to both the coil and switch side of the PARK LAMP relay in the I/P fuse block. When the headlamp switch is placed in either the PARK or HEAD position, ground is applied from G202 to the headlamp switch. The headlamp switch then applies the ground through the park lamp switch ON signal circuit to the body control module (BCM). The BCM then applies a ground to the PARK LAMP relay enable circuit. This energizes the PARK LAMP relay, applying battery positive voltage to all the park, tail, marker and license lamps. The park, tail, marker and license lamps are also turned ON when the headlamps are commanded ON by the BCM for low light operation. Good luck !

Here is the full list of fuses for you! and for the car.

Fuses on E-box, on left in Engine Compartment

Fuse 1 - Not assigned

Fuse 2 - 10/15A - Engine control unit

Fuse 3 - 5A - Radiator fan control unit

Fuse 4 - 5/10/15A - Lambda probe heater,
Lambda probe 1 heater after
catalytic converter

Fuse 5 - 10A, 20A - Lambda probe heater1,
Lambda probe 1 heater after
catalytic converter,
Fuel system diagnostic pump,
Charge pressure control solenoid
valve,
Exhaust gas recirculation cooler
change-over valve,
Crankcase breather heater element,
Vacuum pump for brakes

Fuse 6 - 5A, 10A,15A - Fuel system diagnostic pump,
Throttle valve module,
Activated charcoal filter system
solenoid valve 1,
Continued coolant circulation pump,
Auxiliary air heater heating element

Fuse 7 - 20A, 5A - Ignition transformer,
Fuel pressure regulating valve,
Fuel metering valve

Fuse 8 - 10A - Throttle valve module,
Activated charcoal filter system
solenoid valve 1

Fuse 9 - 5A - Automatic glow period control unit,
Electric fuel pump 2 relay,
Fuel pump relay

Fuse 10 - 5A - Speedometer sender,
Brake light switch

Fuse 11 - Not assigned

Fuse 12 - 5A - Coolant circulation pump

Fuse 13 - 5A - Water pump

Fuse 14 - 5A - Engine control unit

Fuse 15 - 30A - Voltage stabiliser

Fuse 16 - 30A - ABS control unit

Fuse 17 - 30A - Automatic gearbox control unit

Fuse 18 - 20A - Automatic gearbox control unit

Fuse 19 - 1A - Onboard supply control unit

Fuse 20 - 30A - Onboard supply control unit (AW0)
Automatic intermittent wash and
wipe relay (AW1)

Fuse 21 - 50A - Secondary air pump motor

Fuse 22 - Not assigned

Fuse 23 - 40A - ABS control unit

Fuse 24 - 50A - Trailer detector control unit

Fuse 25 - 50A - Terminal 15 voltage supply relay 2

Fuse 26 - 60A - Automatic glow period control unit

Fuse 27 - 60A - Radiator fan

Fuse 28 - 40A - Onboard supply control unit (AW1)

Fuse 29 - 40A - Onboard supply control unit (AW1)

Fuse 30 - 50A - Terminal 75 voltage supply relay 1

Fuse 31 - 30A - Amplifier

Fuse 32 - Not assigned

**************************************************

Fuse assignment - Interior Fuse Panel

Fuse 1 - Not used

Fuse 2 - 5A - Electronic steering column lock control module

Fuse 3 - 10A - Instrument cluster control module

Fuse 4 - Not used

Fuse 5 - Not used

Fuse 6 - 10A - Vehicle electrical system control module,
Interior ceiling lights,
Tail lights

Fuse 7 - 5A - Fog lamp relay,
Instrument panel and switch illumination dimmer switch,
License plate lamps,
Vehicle electrical system control module

Fuse 8 - 7.5A - Windshield and headlamp washer pump switch,
Windshield washer pump

Fuse 9 - 5A - Airbag control module

Fuse 10 - 10A - Right steering column switch

Fuse 11 - Not used

Fuse 12 - Not used

Fuse 13 - 5A - Automatic dimming interior rearview mirror,
Light recognition sensor,
Parking aid control module,
Air quality sensor,
High pressure sensor,
Climatronic control unit,
Tire pressure monitoring button,
Back-up lamp switch,
Left washer nozzle heater,
Right washer nozzle heater,
28-pin connector

Fuse 14 4- 10A - Left steering column switch,
ABS control module,
Light switch,
Airbag spiral spring/return spring with slip ring,
Fuel pump control module,
Data bus on board diagnostic interface

Fuse 15 - 10A - 16-pin connector (diagnostic connector),
Instrument panel and switch illumination dimmer switch,
Headlamp range control adjuster,
Auxiliary heater operation relay,
Mass airflow sensor,
Positive crankcase ventilation heating element,
Left front headlamp,
Left headlamp beam adjustment motor,
Right front headlamp,
Right headlamp beam adjustment motor,

Fuse 16 - 10A - Engine control module

Fuse 17 - Not used

Fuse 18 - 15A - Left front headlamp

Fuse 19 - 15A - Right front headlamp

Fuse 20 - 10A - Automatic transmission control module,
Selector lever sensor system control module,
Tiptronic switch,
Climatronic control unit,
Ignition/starter switch

Fuse 21 - Not used

Fuse 22 - 10A - Ignition/starter switch,
Converter box,
Alarm horn,
Interior monitoring sensor,
Alarm horn relay,
Dual tone horn relay

Fuse 23 - 10A - Vehicle electrical system control module,
16-pin connector (diagnostic connector),
Light switch,
Rain/light recognition sensor,
Compass magnetic field sensor,

Fuse 24 - 10A - Vehicle electrical system control module,
Access/start authorization control module

Fuse 25 - 15A - Automatic transmission control module,
Selector lever sensor system control module,
Multifunction transmission range switch

Fuse 26 - 15A - Brake system vacuum pump

Fuse 27 - Not used

Fuse 28 - 40A - Auxiliary heater operation relay

Fuse 29 - 1A - Vehicle electrical system control module,

Fuse 30 - 20A - Cigarette lighter,
12 V socket,
12 V socket 2,
Blocking diode

Fuse 31 - 30A - Light switch

Fuse 32 - 20A - Light switch

Fuse 33 - 40A - Heater/heat output switch,
Fresh air blower relay,
A/C control module,
Fresh air blower switch

Fuse 34 - 15A - Left front headlamp,
Left front headlamp,
Instrument cluster control module

Fuse 35 - 10A - Steering column electronics control module,
Instrument cluster control module,
Signal horn activation,
Data bus on board diagnostic interface

Fuse 36 - 25A - Vehicle electrical system control module

Fuse 37 - 15A - Left front headlamp DRL

Fuse 38 - 15A - Right front headlamp DRL

Fuse 39 - 15A - Low beam relay

Fuse 40 - 15A - Towing recognition control module

Fuse 41 - 15A - Towing recognition control module

Fuse 42 - 20A - Towing recognition control module

Fuse 43 - 30A - Front passenger door control module

Fuse 44 - A25 - Rear window defogger relay,
Vehicle electrical system control module

Fuse 45 - 30A - Driver door control module,
Front passenger door control module

Fuse 46 - 30A - Left rear door control module,
Right rear door control module

Fuse 47 - 15A - Fuel pump control module,
Fuel pump relay,
Fuel primer relay

Fuse 48 - 20A - Vehicle electrical system control module,
Vehicle electrical system control module,
Vehicle electrical system control module,

Fuse 49 - 20A - Climatronic control unit,
A/C control module

Fuse 50 - 30A - Front seat heating control module

Fuse 51 - 30A - Power sunroof control module

Fuse 52 - 20A - Dual tone horn relay

Fuse 53 - 15A - Front seat heating control module

Fuse 54 - 15A - Fog lamp relay

Fuse 55 - 20A - Light switch,
Left steering column switch

Fuse 56 - Not used

Fuse 57 - 15A - Radio,
Radio/navigation display unit control module

Fuse 58 - 1A, 30A - Telephone transceiver
DC/AC converter with socket, 12V-230V

Fuse 59 - 30A - Amplifier

Fuse 60 - 30A - Auxiliary heater control module


Hope this helps

--N