B3875

DTC B3875

Circuit Description

The body control module (BCM) controls and monitors the state of the wiper high speed relay control circuit. When the windshield wiper switch is placed in to a high speed setting, a signal is applied to the BCM through the windshield wiper switch high signal circuit. The BCM then applies battery positive voltage to the WIPER HI relay through the wiper high speed relay control circuit. This energizes the WIPER HI relay, allowing battery positive voltage to be applies from the WIPER/WS fuse, through the switched contacts of the WIPER relay and through the switched contracts of the WIPER HI relay to the windshield wiper motor. Ground is applied at all times to the coil side of the WIPER HI relay and to the windshield wiper motor from G200.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3875 Wiper High Speed Relay Circuit

Conditions for Running the DTC

* The ignition is in the ON position.
* The ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The following conditions will cause the DTC to set:

* The BCM detects an short to battery positive voltage in the wiper high speed relay control circuit for over 1 second.
* The BCM detects an open or a short to ground in the wiper high speed relay control circuit for over 1 second.

Action Taken When the DTC Sets

The BCM will not activate the Wiper HI relay.

Conditions for Clearing the DTC

* A current DTC B3875 will clear if the short to battery, a short to ground or an open in the wiper high speed relay control circuit is no longer detected by the BCM.
* A history DTC B3875 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
* The BCM receives a clear code command from the scan tool.

Diagnostic Aids

* If the DTC B3875 is a history DTC, the fault may be intermittent. refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
* 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.

Test

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Step 11 - Step 12: