Diagnostic Aids
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- If the DTC B3875 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
- The following conditions may cause an intermittent malfunction or occur:
- An intermittent short to battery, a short to ground or an open in the wiper high speed relay control circuit.
- The WIPER HI relay coil is intermittently shorted to battery.
- The BCM is intermittently shorted to battery, shorted to ground or an open.
DTC B3875
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Wiper/Washer System Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 |
|
Go to Step 6 | Go to Step 4 |
| 4 |
|
Go to Step 5 | Go to Step 7 |
| 5 | Using a test lamp, probe between the wiper high speed relay control circuit and the wiper high relay ground circuit. Does the test lamp illuminate? |
Go to Step 9 | Go to Step 8 |
| 6 | Test for a short to battery positive voltage in the wiper high speed relay control circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 10 |
| 7 | Test for a poor connection, an open or a short to ground in the wiper high speed relay control circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 10 |
| 8 | Test for a poor connection or an open in the ground circuit of the WIPER HI relay. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 11 |
| 9 | Replace the WIPER HI relay. Refer to Relay Replacement (Within an Electrical Center)
or Relay Replacement (Attached to Wire Harness)
in Wiring Systems. Did you complete the replacement? |
Go to Step 11 | Go to Step 12 |
| 10 | Replace the body control module (BCM). Refer to Control Module References
in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? |
Go to Step 12 | - |
| 11 | Replace the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement
in Wiring Systems. Did you complete the replacement? |
Go to Step 12 | - |
| 12 |
|
Go to Step 2 | System OK |