B3715

DTC B3715

CIRCUIT DESCRIPTION
The body control module (BCM) monitors the wiper relay control circuit of the wiper 1 relay. The voltage level should be low while the wiper relay is de-energized. The voltage will be near system voltage while the relay is energized. When the wiper switch is in Low, Intermittent, or Mist positions voltage from the windshield wiper washer switch is applied to the windshield wiper switch signal 1 input of the BCM. The BCM responds by switching control circuit of the wiper 1 relay to B+. This action energizes the wiper 1 relay, providing low speed operation.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3715 Front Wiper Relay Drive Circuit

CONDITIONS FOR RUNNING THE DTC
The ignition is in the RUN or ACC position.

CONDITIONS FOR SETTING THE DTCs
The following conditions will cause the DTC to set:
- The BCM detects a short to ground.
- The BCM detects a short to battery voltage.
- The BCM detects an open circuit.

ACTION TAKEN WHEN THE DTC SETS
- The windshield wipers will be disabled until the conditions mentioned above are no longer present for an open or short to battery.
- The wipers will always be ON if the control circuit from the BCM to wiper relay 1 is shorted to B+.
- No indicator will illuminate on the instrument panel (I/P).

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

TEST DESCRIPTION

Step 1 - Step 11:

The numbers below refer to the step numbers on the diagnostic table.
2. This step tests the ground at the coil side of the wiper 1 relay. The BCM supplies B+ to the coil side of the rear window defogger relay.
3. This step tests the control circuit side of the wiper 1 relay for faults that caused the DTC B3715.
4. This step tests the output of the BCM. Command both the ON and OFF states. Repeat the commands as necessary.
10. After replacement of the BCM, you must calibrate the new module for proper operation.