GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Grand Prix 🢒 DTC 🢒 DTC B3873

Circuit Description

The body control module (BCM) controls and monitors the state of the Windshield Washer Fluid Pump control circuit. The BCM supplies B+ to the pump and the pump is grounded at G100. The voltage level from the BCM should be low while the pump is OFF. The Voltage should be near B+ when the BCM commands the pump ON.

Conditions for Running the DTC
    • The ignition is ON.
    • The ignition voltage is between 9-18.5 volts.

Conditions for Setting the DTC

The following conditions will cause the DTC to set:

    • The BCM detects an over current condition in excess of 6 amps on the Washer pump control circuit for over 1 second.
    • The BCM does not detect the load of the pump or the circuit is open.

Action Taken When the DTC Sets

The BCM will not activate the output.

Conditions for Clearing the DTC
    • This DTC will change from current to history once the ignition is turned OFF and the BCM is asleep.
    • A history DTC will clear after 100 ignition cycles if the condition is no longer present.

Step

Action

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

1

Did you perform the Wiper/Washer Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Wiper/Washer

2
  1. Turn the ignition ON.
  2. Press the windshield washer switch.

Does the windshield washer pump operate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3
  1. Remove the harness connector from the windshield washer pump.
  2. Remove the harness connector from the BCM that contains the Windshield Washer Pump control circuit.
  3. Test the Windshield Washer Pump control circuit between the BCM harness connector and the pump harness connector for a short to ground, short to voltage or an open circuit. Refer to Circuit Testing in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 4

4

With the windshield washer pump disconnected, test the ground circuit of the windshield washer pump harness connector for an open. Refer to Circuit Testing in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5
  1. Connect a jumper between the ground circuit on the Windshield Washer Pump and a good ground.
  2. Measure the on state current using a DMM. Connect a 10 amp fuse protected jumper between the Windshield Washer Pump positive terminal and B+. Refer to Circuit Testing in Wiring Systems.

Is the current measurement greater than 5.5 Amps?

Go to Step 6

Go to Step 7

6

Replace the windshield washer pump. Refer to Washer Pump Replacement .

Did you complete the action?

Go to Step 8

--

7

Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.

Did you complete the action?

Go to Step 8

--

8
  1. Replace all disconnected connectors.
  2. Clear the DTC using the Tech 2.
  3. Operate the system to verify the repair.

Does the DTC reset?

Go to Step 1

System OK