B3719

DTC B3715, B3716, B3717, B3718, or B3719

Circuit Description

The body control module (BCM) monitors the supply voltage circuit of the wiper 1 relay. The voltage should be low while the wiper 1 relay is de-energized. The voltage will be near system voltage when the BCM energizes the wiper 1 relay. The supply voltage circuit of the wiper 1 relay is shared with the signal circuit of the windshield wiper motor park switch internally in the BCM. The BCM monitors the signal circuit of the windshield wiper motor park switch to determine if the windshield wiper motor is operating when commanded. The voltage on the signal circuit of the windshield wiper motor park switch should be near system voltage while the wipers are active. This is the result of the windshield wiper motor park switch being open. The voltage is pulled low when wipers are in or return to the Park position. The windshield wiper motor park switch will be closed, pulling the circuit to ground.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC B3715 Front Wiper Relay Drive Circuit
* DTC B3716 Front Wiper Relay Drive Circuit Range/Performance
* DTC B3717 Front Wiper Relay Drive Circuit Low
* DTC B3718 Front Wiper Relay Drive Circuit High
* DTC B3719 Front Wiper Relay Drive Circuit Open

Conditions for Running the DTC

* The ignition is ON.
* Windshield wiper motor commanded on.

Conditions for Setting the DTC

The following conditions will cause these DTCs to set:

B3715

The signal circuit of the windshield wiper motor park switch has not transition from a high to low state when the windshield wiper motor was commanded on.

B3717 or B3719

The BCM detects a low voltage level or open on the supply circuit of the wiper 1 relay when the relay is energized.

B3718

The BCM detects a high voltage level on the supply circuit of the wiper 1 relay when the relay is energized.

Action Taken When the DTC Sets

The windshield wipers will be disabled until the conditions mentioned above are no longer present.

Conditions for Clearing the DTC

* This DTC will change from current to history when the fault is no longer present.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Test Description

Step 1 - Step 10:

Step 11 - Step 19:

Step 20 - Step 33:

Step 34 - Step 38:

The numbers below refer to the step numbers on the diagnostic table.
10. Listen for an audible click when the Wiper 1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
11. Verifies that the BCM is providing voltage to the Wiper 1 relay.