Headlamp Washer Malfunction
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Headlamp Washer Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Headlamp Washer Fluid Pump Control
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1
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1
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2
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-
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Headlamp Washer Relay Control
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B3810 02
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1
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1
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-
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Headlamp Washer Fluid Pump Ground
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-
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1
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1
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-
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1. Headlamp Washer Inoperative
2. Headlamp Washers Always ON
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Circuit/System Description
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The Body Control Module (BCM) controls the washer motor based on an input from the windshield wiper washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the WASH switch is closed, ground is supplied to the front washer switch signal circuit. When this is seen, the BCM will command the front washer fluid pump and the low speed wipers on. When Headlamp Wash Equipped, the headlamps shall be sprayed with wash fluid as a result of an extended Windshield Wash Switch Activation. In order to preserve wash fluid, the feature shall only be allowed to activate if the Low or High Beam Headlamps are active. In addition, after the initial Headlamp Wash operation has been performed, additional headlamp washes shall not be performed for the next 4 Windshield Wash activations or for 48 hours whichever comes first.
The headlamp wash feature shall only be allowed to be activated if the low or high beam headlamps are active as well.
Schematic Reference
Wiper/Washer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for information on diagnostic tools
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Circuit/System Verification
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Operate the headlamp washer using the S80 Window Wiper/Washer Switch. Verify the G16 Headlamp Washer Fluid Pump activates. The low or high beam headlamps are ON.
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1.
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Ignition OFF, disconnect the KR2 Headlamp Washer Fluid Pump Relay.
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2.
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Connect a test lamp between the control circuit terminal 86 and ground.
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3.
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With the ignition ON, give alternately ON and OFF headlight washing commands to the BCM. The test lamp should then switch on and off.
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4.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
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5.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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6.
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If all circuits test normal, test or replace the KR2 Headlamp Washer Fluid Pump Relay.
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Window Wiper/Washer Switch - Static Test
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1.
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Ignition OFF, disconnect the Harness Connector at the S80 Window Wiper/Washer Switch.
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2.
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Test for less than 5 Ω between Window Wiper/Washer Switch terminal 2 and terminal 5 while activating the S80 Window Wiper/Washer Switch.
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3.
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If not the specified value, replace the S80 Window Wiper/Washer Switch.
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Window Wiper/Washer Switch - Dynamic Test
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1.
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Ignition OFF, disconnect the KR2 Headlamp Washer Fluid Pump Relay.
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2.
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Install a 30 A fused jumper wire between the relay terminals 85, 87 and 12 V. Install a jumper wire between the relay terminal 86 and ground.
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3.
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Connect a test lamp between relay terminal 30 and ground.
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4.
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Observe the test lamp turns ON and OFF by grounding the relay terminal 86 briefly several times.
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5.
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If the function does not perform as specified, replace the KR2 Headlamp Washer Fluid Pump Relay.
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Relay Test
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1.
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Ignition OFF, disconnect the KR2 Headlamp Washer Fluid Pump Relay.
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2.
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Test for 60-200 Ω between terminals 85 and 86.
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3.
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If the resistance is not within the specified range, replace the KR2 Headlamp Washer Fluid Pump Relay.
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4.
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Test for infinite resistance between the following terminals:
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5.
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If greater than the specified range, replace the KR2 Headlamp Washer Fluid Pump Relay.
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Washer Pump - Dynamic Test
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1.
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Ignition OFF, disconnect the harness connector at the G16 Headlamp Washer Fluid Pump.
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2.
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Install a 10 A fused jumper wire between the control terminal 2 and 12 V. Install a jumper wire between the ground terminal 1 and ground.
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3.
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Verify the G16 Headlamp Washer Fluid Pump is activated.
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4.
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If the G16 Headlamp Washer Fluid Pump does not activate , replace the G16 Headlamp Washer Fluid Pump.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
