Buick Regal: Symptoms - Wiper/Washer Systems
NOTE: The following steps must be completed before using the symptom
tables:
1. Perform Diagnostic System Check - Vehicle , in order to verify that all of
the following conditions are true:
- No DTCs are set.
- The control modules can communicate via the serial data link.
2. Refer to Wiper/Washer System Description and Operation in order to
familiarize yourself with the system
functions.
Visual/Physical Inspection
- Inspect for aftermarket devices which may affect the operation of the
windshield wiper/washer system. Refer to Checking Aftermarket Accessories.
- Inspect the easily accessible or visible system components for obvious
damage or conditions which may cause
the symptom.
- Inspect the washer fluid reservoir for the proper fluid level.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent
conditions. Refer to Testing for Intermittent Conditions and Poor Connections.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to
diagnose the symptom:
- Windshield Wiper System Malfunction
- Washer Malfunction
- Rain Sensor Malfunction
WINDSHIELD WIPER SYSTEM MALFUNCTION
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault Information
1. Delay or Low Speed Wipers Inoperative
2. High Speed Wipers Inoperative
3. Wipers Do Not Park
4. Wipers Always ON
Circuit/System Description
The windshield wiper motor is controlled by the body control module (BCM)
through the removable windshield
wiper in conjunction with the removable windshield wiper speed control relay.
When low speed windshield wiper
operation is requested, the BCM will apply voltage to the windshield wiper relay
control circuit. This will cause the
contacts in the windshield wiper relay to close and apply B+ to the windshield
wiper motor through the windshield
wiper low speed control circuit, enabling low speed wiper operation. When high
speed windshield wiper operation is
requested, the BCM continues to apply voltage to the windshield wiper relay
control circuit and also applies ground
to the windshield wiper speed control relay control circuit. This will cause the
contacts in the windshield wiper
speed control relay to close and apply B+ to the windshield wiper motor through
the windshield wiper high speed
control circuit, enabling high speed wiper operation. When the windshield wiper
request is no longer present, the
contacts in the windshield wiper relay and windshield wiper speed control relay
will open, removing B+ from the
wiper motor control circuits.
Reference Information
Schematic Reference
Wiper/Washer Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool Windshield Wiper High Speed Switch parameter changes
between Active and Inactive
when activating the high speed windshield wipers.
- If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper/Washer Switch
Malfunction.
- Go to next step: If the parameter changes
3. Verify the scan tool Windshield Wiper Switch parameter changes between Off
and Low when activating the
low speed windshield wipers.
- If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper/Washer Switch
Malfunction.
- Go to next step: If the parameter changes
4. Verify the scan tool Windshield Wiper Switch parameter changes between
Delay 1 and Delay 5 when cycling
the intermittent speed windshield wipers.
- If the parameter does not change
Test or replace the S82 Windshield Wiper/Washer Switch.
- Go to next step: If the parameter changes
5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High
when cycling the S82
Windshield Wiper/Washer Switch between Off, Low, and High.
- If the M75 Windshield Wiper Motor does not cycle between Off, Low,
and High
Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction
- Go to next step: If the M75 Windshield Wiper Motor cycles between
Off, Low, and High
6. Ignition OFF.
7. Verify the scan tool Windshield Wiper Park Switch parameter is Active.
- If the parameter does not change
Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction.
- Go to next step: If the parameter changes
8. All OK.
Circuit/System Testing
Windshield Wiper/Washer Switch Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector
at the S82 Windshield
Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power
down.
2. Test for less than 10 Ω between the low reference circuit terminal 1 and
ground.
- Ignition OFF, disconnect the harness connector at the K9 Body Control
Module.
- Test for less than 2 Ω in the low reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- Go to next step: If less than 10 Ω
3. Ignition ON.
4. Verify the scan tool Windshield Wiper High Speed Switch parameter is
Inactive.
- Ignition OFF, disconnect the harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal 2 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K9 Body Control Module.
- Go to next step: If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and
the low reference circuit terminal 1.
6. Verify the scan tool Windshield Wiper High Speed Switch
parameter is Active.
- Ignition OFF, remove the jumper wire, disconnect the
harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and
ground.
- If 1 V or greater, repair the short to voltage on
the circuit.
- Go to next step: If less than 1 V
- Test for less than 2 Ω in the signal circuit end to
end.
- If 2 Ω or greater, repair the open/high
resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control
Module.
- Go to next step: If Active
7. Test for greater than 8 V between the signal circuit
terminal 3 and ground.
- Ignition OFF, disconnect the harness connector at the
K9 Body Control Module.
- Test for infinite resistance between the signal
circuit and ground
- If less than infinite resistance, repair the
short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the signal circuit end to
end.
- If 2 Ω or greater, repair the open/high
resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control
Module.
- Go to next step: If 8 V or greater
8. Ignition OFF, disconnect the X3 harness connector at
the K9 Body Control Module, ignition ON.
9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal
circuit terminal 3 and ground.
Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
10. Test or replace the S82 Windshield Wiper/Washer
Switch.
Windshield Wiper Motor Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect
the harness connector at the M75 Windshield Wiper
Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to
end.
- If 2 Ω or greater, repair the open/high
resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance
in the ground connection.
- Go to next step: If less than 10 Ω
3. Ignition ON.
4. Verify the scan tool Windshield Wiper Park Switch parameter is Inactive.
- Ignition OFF, disconnect the harness connector at the
K9 Body Control Module.
- Test for infinite resistance between the signal
circuit terminal 3 and ground.
- If less than infinite resistance, repair the
short to ground on the circuit.
- If infinite resistance, replace the K9 Body
Control Module.
- Go to next step: If Inactive
5. Install a 3 A fused jumper wire between the signal
circuit terminal 3 and the ground circuit terminal 5.
6. Verify the scan tool Windshield Wiper Park Switch
parameter is Active.
- Ignition OFF, remove the jumper wire, disconnect the
harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and
ground.
- If 1 V or greater, repair the short to voltage on
the circuit.
- Go to next step: If less than 1 V
- Test for less than 2 Ω in the signal circuit end to
end.
- If 2 Ω or greater, repair the open/high
resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control
Module.
- Go to next step: If Active
7. Ignition OFF and all vehicle systems OFF, disconnect
the KR12B Windshield Wiper Relay. It may take up to
2 min for all vehicle systems to power down.
8. Test for less than 10 Ω between the ground circuit terminals listed below and
ground.
- terminal 85
- terminal 87A
- If 10 Ω or greater
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to
end.
- If 2 Ω or greater, repair the open/high
resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance
in the ground connection.
- Go to next step: If less than 10 Ω
9. Ignition ON.
10. Verify a test lamp illuminates between the B+ circuit terminal 87 and the
ground circuit terminal 87A.
- If the test lamp does not illuminate and the circuit fuse is good
Replace the X50A Fuse Block - Underhood.
- If the test lamp does not illuminate and the circuit fuse is open
- Ignition OFF, remove the test lamp. Disconnect the KR12C Windshield
Wiper Speed Control Relay.
- Test for infinite resistance between the control circuits listed below
and ground.
- Terminal 87A
- Terminal 87
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the M75 Windshield Wiper Motor
- Go to next step: If the test lamp illuminates
11. Connect a test lamp between the control circuit terminal 86 and the
ground circuit terminal 85.
12. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper
Motor Relay Low and Off
with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the K9 Body Control Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the K9 Body Control Module,
ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K9 Body Control Module.
- Go to next step: If the test lamp turns ON and OFF
13. Ignition OFF, connect the KR12B Windshield Wiper Relay and disconnect the
KR12C Windshield Wiper
Speed Control Relay, ignition ON.
14. Test for less than 10 Ω between the control circuit terminal 30 and ground.
Test or replace the KR12B Windshield Wiper Relay.
- Go to next step: If less than 10 Ω
15. Connect a test lamp between the control circuit terminal 30 and ground.
16. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper
Motor Relay Low and Off
with a scan tool.
- If the test lamp does not turn ON and OFF
Test or replace the KR12B Windshield Wiper Relay.
- Go to next step: If the test lamp turns ON and OFF
17. Verify a test lamp illuminates between the B+ circuit terminal 85 and
ground.
- If the test lamp does not illuminate
Replace the X50A Fuse Block - Underhood.
- Go to next step: If the test lamp illuminates
18. Connect a test lamp between the B+ circuit terminal 85 and the control
circuit terminal 86.
19. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper
High Speed Relay High and
Off with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the K9 Body Control Module,
ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition OFF.
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the harness connector at
the K9 Body Control Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K9 Body Control Module.
20. Ignition OFF, connect the KR12C Windshield Wiper Speed Control Relay.
21. Connect a test lamp between the M75 Windshield Wiper Motor control circuit
terminal 1 and ground circuit
terminal 5, ignition ON.
22. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper
Motor Relay Low and Off
with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp, disconnect the KR12C Windshield
Wiper Speed Control Relay.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the KR12C Windshield Wiper Speed
Control Relay.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the KR12C Windshield
Wiper Speed Control Relay,
ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, test or replace the KR12C Windshield Wiper Speed
Control Relay.
- Go to next step: If the test lamp turns ON and OFF
23. Connect a test lamp between the M75 Windshield Wiper Motor control
circuit terminal 4 and ground circuit
terminal 5, ignition ON.
24. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper
High Speed Relay High and
Off with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp, disconnect the KR12C Windshield
Wiper Speed Control Relay.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, test or replace the KR12C Windshield Wiper Speed
Control Relay.
- If the test lamp is always ON
- Ignition OFF, remove the test lamp, disconnect the KR12C Windshield
Wiper Speed Control Relay,
ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, test or replace the KR12C Windshield Wiper Speed
Control Relay.
- Go to next step: If the test lamp turns ON and OFF
25. Test or replace the M75 Windshield Wiper Motor.
Component Testing
Windshield Wiper/Washer Switch
1. Ignition OFF, disconnect the harness connector at the S82 Windshield
Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 2 and the low
reference terminal 1 with the high speed
switch in the open position.
- If less than infinite resistance
Replace the S82 Windshield Wiper/Washer Switch.
- Go to next step: If infinite resistance
3. Test for less than 2 Ω between the signal circuit terminal 2 and the low
reference circuit terminal 1 with the
high speed switch in the closed position.
Replace the S82 Windshield Wiper/Washer Switch.
- Go to next step: If less than 2 Ω
4. Test for infinite resistance between the signal terminal 3 and the low
reference terminal 1 with the low speed
switch in the open position.
- If less than infinite resistance
Replace the S82 Windshield Wiper/Washer Switch.
- Go to next step: If infinite resistance
5. Test for the resistance values listed below between the signal circuit
terminal 3 and the low reference circuit
terminal 1 by cycling the switch between Delay 1 and Delay 5.
- Delay 1 : 3.8 kΩ
- Delay 2 : 2.8 kΩ
- Delay 3 : 1.9 kΩ
- Delay 4 : 2.8 kΩ
- Delay 5 : 770 Ω
- If not within the resistance values listed
Replace the S82 Windshield Wiper/Washer Switch.
- Go to next step: If within the resistance values listed
Relay Test
1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60 - 200 Ω between terminals 85 and 86.
- If less than 60 or greater than 200
Replace the relay.
- Go to next step: If between 60 - 200 Ω
3. Test for infinite resistance between the terminals listed below:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If less than infinite resistance
Replace the relay.
- Go to next step: If infinite resistance
4. Test for less than 5 Ω between terminals 30 and 87A.
Replace the relay.
- Go to next step: If less than 5 Ω
5. Install a 10 A fused jumper wire between relay terminal 85 and 12 V.
Install a jumper wire between relay
terminal 86 and ground.
6. Test for less than 5 Ω between terminals 30 and 87.
Replace the relay.
- Go to next step: If less than 5 Ω
7. All OK
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic
procedure.
- Windshield Wiper Motor Replacement
- Relay Replacement (Attached to Wire Harness) Relay Replacement (Within
an Electrical Center)
- Windshield Wiper and Washer Switch Replacement
- Control Module References for BCM replacement, setup, and programming
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Warning:
Driving with more than one
compact spare tire at a time could
result in loss of braking and
handling. This could lead to a
crash and you or others could be
injured. Use only one compact
spare tire at a time.
If this vehicle has a compact spare
tire, it was fully inflated when new;
however,
ABS DESCRIPTION AND OPERATION
B22 - B22 Brake Pedal Position Sensor
S48E - S48E Multifunction Switch - Center Console
P16 - P16 Instrument Cluster
K9 - K9 Body Control Module
K20 - K20 Engine Control Module
K71 - K71 Transmission Control Module
K17 - K17 Electronic Brake Control Module
Q5 - Q5 Brak