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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> DTC B3922 - Front Wiper Select Circuit >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections .

DTC B3922

Step Action Yes No
Schematic Reference: Wiper/Washer System Schematics 
Connector End View Reference: Master Electrical Component List
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. Rotate the wiper washer switch through all the positions.
Does the wipers operate correctly?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Turn the ignition to the OFF position.
  2. Disconnect the body control module (BCM) connector C3.
  3. At the BCM connector C3, install a jumper between ground and the ground supply circuit to the windshield wiper/washer switch.
  4. Turn the wiper washer switch to the OFF position.
  5. Using a test lamp connected to ground, probe the wiper switch low signal circuit at the BCM connector C3.
Does the test lamp illuminate?		 Go to Step 9  Go to Step 4 
4
  1. Remove the ground.
  2. Using a test lamp connected to battery positive voltage, probe the wiper switch low signal circuit at the BCM connector C3.
Does the test lamp illuminate?		 Go to Step 10  Go to Step 5 
5
  1. Install a jumper between ground and the ground supply circuit to the wiper/washer switch.
  2. Using a test lamp connected to battery positive voltage, probe the wiper switch low signal circuit at the BCM connector C3.
  3. Turn the wiper switch to all of the low settings.
Does the test lamp illuminate at each switch position?		 Go to Step 6  Go to Step 8 
6
  1. Disconnect the BCM connector C1.
  2. Using a test lamp connected to battery positive voltage, probe the windshield wiper motor park switch signal circuit.
Does the test lamp illuminate?		 Go to Step 7  Go to Step 12 
7 Test for a short to ground in the windshield wiper motor park switch signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 11 
8 Test for a poor connection or an open in the wiper switch low signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
9 Repair a short to battery positive voltage in the wiper switch low signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 14  -
10 Repair a short to ground in the wiper switch low signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 14  -
11 Replace the windshield wiper motor. Refer to Wiper Motor Replacement .
Did you complete the repair?		 Go to Step 14  -
12 Replace the BCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 14  -
13 Replace the windshield wiper/washer switch. Refer to Wipers/Washer Switch Replacement .
Did you complete the replacement?		 Go to Step 14  -
14
  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
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