Diagnostic Instructions
DTC Descriptor
DTC B3810: Headlamp Washer Relay Circuit
DTC B3811: Rear Washer Relay Circuit
Circuit/System Description
Battery positive voltage is supplied to the coil and switch sides of the rear washer and headlamp washer relays. The body control module (BCM) energizes a relay by grounding the relay coil through the relay control circuit. When a relay is energized, the
relay switch is closed and battery positive voltage is supplied to the washer pump control circuit.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
B3810
The headlamp washer relay control circuit is shorted to ground or open while the relay is de-energized, or shorted to B+ while the relay is energized.
B3811
The rear washer relay control circuit is shorted to ground or open while the relay is de-energized, or shorted to B+ while the relay is energized.
Action Taken When the DTC Sets
| • | The DTC will be current for as long as the fault is present. |
| • | The headlamp washers will be disabled for as long as the B3810 is current. |
| • | The rear washers will be disabled for as long as the B3811 is current. |
Conditions for Clearing the DTC
| • | This DTC will clear on current status after the condition for setting the fault is corrected. |
| • | A history DTC will clear after 50 consecutive ignition cycles without a fault present. |
Reference Information
Schematic Reference
Wiper/Washer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the affected relay.
- Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the washer pump control circuit terminal 30 for a short to ground. If the
circuit tests normal, test or replace the affected relay. |
- Connect a test lamp between the B+ circuit terminal 85 and the relay control circuit terminal 86.
- Command the affected washer pump ON and OFF with a scan tool. 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 ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
- If all circuits test normal, replace the affected relay.
Component Testing
- Ignition OFF, disconnect the relay.
- Test for 60-200 ohms between terminals 85 and 86.
| ⇒ | If the resistance is not within the specified range, replace the relay. |
- Test for infinite resistance between the following terminals:
| ⇒ | If not the specified value, replace the relay. |
- Test for less than 2 ohms between terminals 30 and 87A.
| ⇒ | If greater than the specified range, replace the relay. |
- Install a 10A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
| ⇒ | If greater than the specified range, replace the relay. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
