Headlamp Washer Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
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Signal Performance
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Headlamp Washer Fluid Pump Control
|
1
|
1
|
2
|
--
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Headlamp Washer Relay Control
|
B3810 02
|
1
|
2
|
--
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Headlamp Washer Fluid Pump Ground
|
--
|
1
|
1
|
--
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1. Headlamp Washer Inoperative
2. Headlamp Washers Always ON
|
Circuit/System Description
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 windscreen 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. In the event that the system has detected a
Stuck Front Wash Switch condition, the Headlamp Wash Feature shall
be disabled.
Diagnostic Aids
The headlamp wash feature shall only be activated if the dipped
or main beam headlamps are active too.
Reference Information
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 scan tool information
Circuit/System Verification
Dipped or main beam headlamps ON, operate the headlamp washer
using the S82 Windscreen Wiper/Washer Switch. Verify the
G16 Headlamp Washer Fluid Pump activates.
Circuit/System Testing
- Ignition OFF, disconnect the KR2 Headlamp Washer
Fluid Pump Relay.
- Connect a test lamp between the ground circuit
terminal 86 and B+.
- The test lamp should illuminate.
⇒ |
If the test lamp does not illuminate, test the
ground circuit for an open/high resistance or a short to
voltage. |
⇒ |
If the circuit tests normal, replace the
X50A Fuse Block - Underhood. |
- Connect a test lamp between the control circuit
terminal 85 and ground.
- Ignition ON, command the headlamp washer ON and OFF
using the wiper switch. The test lamp should turn ON and OFF when
changing between the commanded states.
⇒ |
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. |
⇒ |
If the test lamp is always OFF, test for a short
to ground or an open/high resistance on the control circuit. If the
circuit tests normal, replace the K9 Body Control Module. |
- If all circuits test normal, test or replace the
KR2 Headlamp Washer Fluid Pump Relay.
- Connect a test lamp between the B+ circuit
terminal 87 and ground.
⇒ |
If the test lamp does not illuminate, test the B+
circuit for an open/high resistance. |
- Disconnect the harness connector at the
G16 Headlamp Washer Fluid Pump.
- Test for less than 5 Ω between the ground circuit
terminal 1 at the G16 Headlamp Washer Fluid Pump and
ground.
⇒ |
If not the specified value, test the ground
circuit for an open/high resistance or a short to voltage. |
- Test for less than 5 Ω between the control
circuit terminal 30 at the KR2 Headlamp Washer Fluid Pump
Relay socket and the control terminal 2 at the
G16 Headlamp Washer Fluid Pump.
⇒ |
If not the specified value, test the control
circuit for an open/high resistance or a short to voltage. |
- Test for greater than 500 kΩ between the control
circuit terminal 30 at the KR2 Headlamp Washer Fluid Pump
Relay socket and the control terminal 2 at the
G16 Headlamp Washer Fluid Pump.
⇒ |
If not the specified value, test the control
circuit for a short to ground. |
Component Testing
Window Wiper/Washer Switch - Static Test
- Ignition OFF, disconnect the harness connector X3
at the K9 Body Control Module.
- Test for less than 5 Ω between the signal circuit
terminal 25 X3 and the low reference circuit terminal 10
X3 while activating the S82 Windscreen Wiper/Washer
Switch.
⇒ |
If the resistance is not within the specified
range, test the circuits for an open/high resistance and a short to
voltage. |
- If all circuits test normal, replace the
S82 Windscreen Wiper/Washer Switch.
Window Wiper/Washer Switch - Dynamic Test
- Ignition OFF, disconnect the KR2 Headlamp Washer
Fluid Pump Relay.
- Install a 30 A fused jumper wire between the
relay terminals 86, 87 and 12 V. Install a jumper wire between
the relay terminal 85 and ground.
- Connect a test lamp between relay terminal 30 and
ground.
- Observe the test lamp turns ON and OFF by grounding
the relay terminal 85 briefly several times.
⇒ |
If the function does not perform as specified,
replace the KR2 Headlamp Washer Fluid Pump Relay. |
Relay Test
- Ignition OFF, disconnect the KR2 Headlamp Washer
Fluid Pump Relay.
- Test for 60-200 Ω between terminals 85 and
86.
⇒ |
If the resistance is not within the specified
range, replace the KR2 Headlamp Washer Fluid Pump Relay. |
- Test for infinite resistance between the following
terminals:
⇒ |
If not the specified value, replace the
KR2 Headlamp Washer Fluid Pump Relay. |
- Install a 10 A fused jumper wire between relay
terminal 85 and 12 V. Install a jumper wire between relay
terminal 86 and ground. Test for less than 5 Ω between
terminals 30 and 87.
⇒ |
If greater than the specified range, replace the
KR2 Headlamp Washer Fluid Pump Relay. |
Washer Pump - Dynamic Test
- Ignition OFF, disconnect the harness connector at the
G16 Headlamp Washer Fluid Pump.
- 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.
- Verify the G16 Headlamp Washer Fluid Pump is
activated.
⇒ |
If the G16 Headlamp Washer Fluid Pump does
not activate , replace the G16 Headlamp Washer Fluid
Pump. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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