GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Canyon Pickup - 2WD 🢒 DTC 🢒 DTC B3715, B3716, B3717, B3718, or B3719

Circuit Description

The body control module (BCM) controls and monitors the state of the WIPER relay control circuit. When the windshield wiper switch is placed in to a low speed setting, a signal is applied to the BCM. The BCM then applies battery positive voltage to the coil side of the WIPER relay through the relay control circuit. This energizes the relay, allowing battery positive voltage from the WIPER fuse through the switched side of the WIPER relay through the WIPER 2 relay and to the windshield wiper motor. Ground is applied at all times to the coil sides of the wiper relays and the windshield wiper motor from G105.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B3717 Front Wiper Relay Drive Circuit Low
    • DTC B3718 Front Wiper Relay Drive Circuit High

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

Conditions for Setting the DTCs

The following conditions will cause these DTCs to set:

    • DTC B3717, the BCM detects a low voltage level on the supply circuit of the wiper micro relay for 1 second when the relay is energized.
    • DTC B3718, the BCM detects a high voltage level on the supply circuit of the wiper micro relay for 1 second when the relay is de-energized.

Action Taken When the DTC Sets

The BCM de-energizes the wiper micro relay, until the wiper switch is turned OFF and ON.

Conditions for Clearing the DTCs
    • DTC B3717 will change from current to history when the windshield wiper switch is turned OFF and ON, and the condition is no longer present.
    • DTC B3718 will change from current to history when the condition is no longer present.
    • A history DTC will clear after 100 ignition cycles, without a repeat of the malfunction.

Step

Action

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn the ignition to the ON position.
  2. Turn the wiper switch to the low position.

Do the windshield wipers operate?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3
  1. Turn the ignition to the OFF position.
  2. Turn the wiper switch OFF.
  3. Remove the WIPER relay from the underhood fuse block.
  4. Using a test lamp connected to ground, probe the relay control circuit at the underhood fuse block.

Does the test lamp illuminate?

Go to Step 8

Go to Step 4

4
  1. Leave the test lamp connected.
  2. Turn the ignition to the ON position.
  3. Turn the wiper switch to the low position.

    4. NOTE: Test lamp should illuminate for 3 seconds then turn off.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5
  1. Turn the wiper switch to the OFF position.
  2. Turn the ignition to the OFF position.
  3. Using a test lamp, probe the relay control circuit and the ground circuit of the relay at the underhood fuse block.
  4. Turn the ignition to the ON position.
  5. Turn the wiper switch to the low position.

Does the test lamp illuminate?

Go to Step 9

Go to Step 7

6

Test for the following in the WIPER relay control circuit:

    • A poor connection
    •  An open
    • A short to ground

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 10

7

Test for a poor connection or an open in the ground circuit of the WIPER relay. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 11

8

Repair a short to battery positive voltage in the WIPER relay control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 12

--

9
  1. Replace the WIPER relay. Refer to Relay Replacement .
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 11

Go to Step 12

10

Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 12

--

11

Replace the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement .

Did you complete the replacement?

Go to Step 12

--

12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions For Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK