Buick Regal: Headlamp Washer 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. Headlamp Washer Inoperative
2. Headlamp Washers Always ON
Circuit/System Description
The headlamp washer pump is controlled by the body control module (BCM) via a
removable relay. If the headlamp
lights are on, the BCM will activate the headlamp washer pump the first time the
windshield washer pump is
activated. After the initial headlamp washer activation, the BCM will only allow
headlamp washer function every 5
windshield washer cycles. When the headlamp washer function is requested by the
BCM's internal logic, it applies
voltage through a control circuit to the headlamp washer pump relay. With the
relay energized, battery voltage is
applied through the switch contacts of the relay and the fused control circuit
to activate the headlamp washer pump.
Diagnostic Aids
The headlamp wash feature will only be activated if the low or high beam
headlamps are active as well.
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 headlamp washers turn ON and OFF when commanding the Headlamp
Washer Relay Active and
Inactive with a scan tool.
- If the Headlamp Washer Relay does not turn ON and OFF
Refer to Circuit/System Testing
- Go to next step: If the Headlamp Washer Relay turns ON and OFF
3. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the KR2 Headlamp
Washer Pump Relay. It may take up
to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 86 and ground.
- 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 a test lamp illuminates between the B+ circuit terminal 30 and ground.
- 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 harness connector at
the G16 Headlamp Washer
Pump.
- Test for infinite resistance between the control circuit terminal 2 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the G16 Headlamp Washer Pump.
- Go to next step: If the test lamp illuminates
5. Connect a test lamp between the control circuit terminal 85 and the ground
circuit terminal 86.
6. Verify the test lamp turns ON and OFF when commanding the Headlamp Washer
Relay Active and Inactive
with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, remove the test lamp, disconnect the X5 harness connector
at the K9 Body Control
Module.
- Test for infinite resistance between the control circuit terminal 26 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 X5 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
7. Verify that a test lamp does not illuminate between the control circuit
terminal 87 and ground.
- If the test lamp illuminates
Repair the short to voltage on the control circuit
- Go to next step: If the test lamp does not illuminate
8. Ignition OFF and all vehicle systems OFF, disconnect the harness connector
at the G19 Headlamp Washer
Pump. It may take up to 2 minutes for all vehicle systems to power down.
9. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
- 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
10. Connect the harness connector at the G19 Headlamp Washer Pump.
11. Ignition ON, connect a 15 A fused jumper wire between the control circuit
terminal 87 and B+.
12. Verify the G19 Headlamp Washer Pump is activated.
- If the G19 Headlamp Washer Pump does not activate
- Ignition OFF, remove the jumper wire, disconnect the harness connector
at the G19 Headlamp Washer
Pump.
- 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 G19 Headlamp Washer Pump.
- Go to next step: If the G19 Headlamp Washer Pump activates
13. Test or replace the KR2 Headlamp Washer Pump Relay.
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 5 and the low
reference terminal 2 with the 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 5 and the low
reference circuit terminal 2 with the
switch in the closed position.
Replace the S82 Windshield Wiper/Washer Switch.
- Go to next step: If less than 2 Ω
4. All OK
Relay Test
1. Ignition OFF, disconnect the KR2 headlamp washer pump relay.
2. Test for 60 - 200 Ω between terminals 85 and 86.
- If less than 60 or greater than 200
Replace the KR2 headlamp washer pump 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 KR2 headlamp washer pump relay.
- Go to next step: If infinite resistance
4. Install a 10 A fused jumper wire between relay terminal 85 and 12 V.
Install a jumper wire between relay
terminal 86 and ground.
5. Test for less than 10 Ω between terminals 30 and 87.
Replace the KR2 headlamp washer pump relay.
- Go to next step: If less than 10 Ω
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Relay Replacement (Attached to Wire Harness) Relay Replacement (Within
an Electrical Center)
- Windshield Wiper and Washer Switch Replacement
- Engine Wiring Harness Junction Block Replacement (LTG) Engine Wiring
Harness Junction Block
Replacement (LGX)
- Control Module References for BCM replacement, programming and setup
READ NEXT:
Preliminary Procedures
1. Steering Column Lower Trim Cover Replacement.
2. Reposition the steering column upper trim cover as necessary.
Windshield Wiper and Washer Switch
Procedure
Disconn
Preliminary Procedures
Windshield Wiper Arm Replacement - Remove [2x].
Air Inlet Grille Panel Retainer [6x]
Air Inlet Grille Panel
Procedure
Unlock the retaining tabs.
AIR INLET GRILLE PANEL WA
SEE MORE:
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.
DTC Descriptors
D
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.
DTC Descriptors
D