Washer Malfunction - Sedan
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Windscreen Washer Switch Signal
|
2
|
1
|
1
|
--
|
Washer Fluid Level Switch Signal
|
4
|
3
|
3
|
--
|
Windscreen Washer Fluid Pump Control
|
1
|
1
|
2
|
--
|
Windscreen Washer Relay Control
|
B3873 02
|
B3873 04
|
B3873 01
|
-
|
Washer Fluid Level Switch Ground
|
--
|
3
|
--
|
--
|
Windscreen Washer Fluid Pump Ground
|
--
|
1
|
--
|
--
|
1. Front washer inoperative.
2. Front washer always ON.
3. Washer fluid level indicator inoperative.
4. Washer fluid level indicator always ON.
|
Circuit/System Description
The body control module (BCM) controls the windscreen washer
fluid pump based on an input from the wiper/washer switch. The BCM
monitors the washer switch through the wiper/washer switch signal
circuit. When the wash switch is closed, ground is supplied to the
windscreen washer switch signal circuit. When this is the case, the
BCM will command the windscreen washer fluid pump and the low speed
wipers on.
On some vehicles warning information (wash fluid low) will be
conveyed via the GMLAN to the controls and displays subsystem
(responsible for display). This subsystem will provide visual
feedback to the customer while in the RUN power mode.
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
- Ignition ON, observe the scan tool Windscreen Washer
Switch parameter while activating the S82 Windscreen
Wiper/Washer Switch. The parameter should change between Active and
Inactive.
⇒ |
If the value does not change, refer to
Multifunction Switch Malfunction. |
- Operate the windscreen washer using the
S82 Windscreen Wiper/Washer Switch. Verify that the
G24 Windscreen Washer Pump activates. Verify the washer fluid
reservoir is filled up.
⇒ |
If the G24 Windshield Washer Pump does not
run, refer to Washer Pump Malfunction. |
⇒ |
If the G24 Windscreen Washer Pump does not
shut off, test or replace the KR11 Windscreen Washer Pump
Relay. |
Circuit/System Testing
Note: You must perform the
Circuit/System Verification before proceeding with Circuit/System
Testing.
Multifunction Switch Malfunction
- Ignition OFF, disconnect the X3 harness connector at
the K9 Body Control Module.
- Test for less than 5 Ω between the
S82 Windscreen Wiper/Washer Switch signal circuit
terminal 5 and the K9 Body Control Module
terminal 25 while activating the wash function.
⇒ |
If greater than the specified value, test the
signal circuit for an open/high resistance. If the circuit tests
normal, replace the S82 Windscreen Wiper/Washer Switch. |
- If all circuits test normal, test or replace the
K9 Body Control Module.
Washer Pump Malfunction
- Ignition OFF, disconnect the harness connector at the
G24 Windscreen Washer Pump.
- Ignition ON, verify a test lamp does not illuminate
between the control circuit terminal 1 and the ground circuit
terminal 2.
⇒ |
If the test lamp illuminates, test the control
circuit for a short to voltage. If the circuit tests normal, test
or replace the KR11 Windscreen Washer Pump Relay. |
- Verify a test lamp illuminates between the control
circuit terminal 1 and the ground circuit terminal 2
while activating the wash function.
⇒ |
If the test lamp does not illuminate, test the
ground circuit for a short to voltage or an open/high
resistance. |
- If all circuits test normal, test or replace the
G24 Windscreen Washer Pump.
Low Washer Fluid Indicator Malfunction
- Verify the washer fluid reservoir is filled up.
- Ignition OFF, disconnect the harness connector at the
B118B Windshield Washer Fluid Level Switch.
- Test for less than 5 Ω between the ground
terminal 2 and ground.
⇒ |
If greater than the specified value, test the
ground circuit for a short to voltage or an open/high
resistance. |
- Ignition OFF, disconnect the harness connector at the
P16 fInstrument Cluster.
- Test for less than 5 Ω between the signal circuit
terminal 1 at the B118B Windscreen Washer Fluid Level
Switch harness connector and signal terminal 29 at the
P16 Instrument Cluster harness connector.
⇒ |
If greater than the specified value, test the
signal circuit for a short to voltage or an open/high
resistance. |
- Reconnect all harness connectors.
- Ignition ON, command the Driver Information Center
Segment test ON and OFF with the scan tool, verify that the low
washer fluid indicator display reacts to ON and OFF positions.
⇒ |
If the low washer fluid indicator display stays
always ON or always OFF, replace the P16 Instrument
Cluster. |
- If the low washer fluid indicator display changes
between ON and OFF, test or replace the B118B Windshield
Washer Fluid Level Switch.
Component Testing
Multifunction Switch Test
- Ignition OFF, disconnect the harness connector at the
S82 Windscreen Wiper/Washer Switch.
- Test for less than 5 Ω between the switch
terminals 2 and 5 while activating the washer
function.
⇒ |
If not the specified value, replace the
S82 Windscreen Wiper/Washer Switch. |
Washer Pump Test
- Ignition OFF, disconnect the harness connector at the
G24 Windscreen Washer Pump.
- Install a 10A fused jumper wire between the control
terminal 1 and 12V. Install a jumper wire between the ground
terminal 2 and ground.
- Verify the G24 Windscreen Washer Pump is
activated.
⇒ |
If the G24 Windshield Washer Pump does not
activate, replace the G24 Windshield Washer Pump. |
Relay Test
- Ignition OFF, disconnect the KR11 Windscreen
Washer Pump Relay.
- Test for 60-200 Ω between terminals 85 and
86.
⇒ |
If the resistance is not within the specified
range, replace the KR11 Windscreen Washer Pump Relay. |
- Test for infinite resistance between the following
terminals:
⇒ |
If not the specified value, replace the
KR11 Windscreen Washer Pump Relay. |
- Test for less than 5 Ω between terminals 30
and 87A.
⇒ |
If greater than the specified range, replace the
KR11 Windscreen Washer 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
KR11 Windscreen Washer Pump Relay. |
Low Washer Fluid Switch Test
- Ignition OFF, remove the B118B Windshield Washer
Fluid Level Switch.
- B118B Windscreen Washer Fluid Level Switch open,
test for infinite resistance between the signal circuit
terminal 1 and the ground terminal 2.
⇒ |
If not the specified value, replace the
B118B Windscreen Washer Fluid Level Switch. |
- B118B Windscreen Washer Fluid Level Switch
closed, test for less than 5 Ω between the signal circuit
terminal 1 and the ground terminal 2.
⇒ |
If not the specified range, replace the
B118B Windshield Washer Fluid Level Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure
|