Diagnostic Aids
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 WPR2 relay control circuit.
- The WPR2 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 WPR2 relay control circuit and the WPR2 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 WPR2 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 WPR2 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 WPR2 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 WPR2 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 |