B3873

DTC B3873

CIRCUIT DESCRIPTION
The body control module (BCM) monitors the windshield washer pump low reference circuit only when a wash cycle is active. When a wash cycle is requested, the BCM responds by applying a ground through the windshield washer pump low reference circuit to the coil side of the relay, energizing the windshield washer relay.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3873 Front Washer Relay Circuit

CONDITIONS FOR RUNNING THE DTC
This DTC can set only when the BCM output to the windshield washer relay is active.

CONDITIONS FOR SETTING THE DTC
The BCM detects an short to battery voltage in the windshield washer pump low reference circuit.

ACTION TAKEN WHEN THE DTC SETS
The BCM will not activate the output to the windshield washer relay.

CONDITIONS FOR CLEARING THE DTC
- The current DTC will become history when the request for the output is removed or when condition for setting the fault is corrected.
- The history DTC will clear after 50 consecutive ignition cycles without a fault present.

TEST DESCRIPTION

Step 1 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for constant ground in the low reference circuit of the wiper relay.
4. This step verifies that the BCM is applying a ground through the low reference circuit to the wiper relay.
5. This step tests for an open in the battery positive voltage circuit of the wiper relay.