SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1750 (WIPERS SYSTEM AND WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B3723TEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step will determine if the rear wiper relay is internally shorted to battery voltage. Once you have disconnected the relay, you should be able to clear DTC B3723 with no recurrence. It is, however, normal for DTC B3722 to set while the relay is disconnected.
  2. 3:  This step will determine if the rear wiper relay control circuit is shorted to battery voltage, or if the BCM is at fault.
DTC B3723

Step Action Yes No
Schematic Reference: Wiper/Washer 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 
IMPORTANT: DTC B3722 may set as a result of disconnecting the REAR WIPER Relay.
  1. Turn the front and rear wiper and washer switches OFF.
  2. Turn OFF the ignition.
  3. Disconnect the REAR WIPER Relay from the underhood fuse block.
  4. Turn ON the ignition, with the engine OFF.
  5. Use a scan tool to clear DTC B3723.
Does DTC B3723 clear?		 Go to Step 5  Go to Step 3 
3  Test the rear wiper relay control circuit for a short to battery. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 6  Go to Step 4 
4 Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 6  -
5 Replace the rear wiper relay. Refer to Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center) .
Did you complete the replacement?		 Go to Step 6  -
6
  1. Use the scan tool 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
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.