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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1750 (WIPERS SYSTEM AND WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWIPERS ALWAYS ON
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Wipers Always On

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Wipers Always On
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.
Wipers Always On

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
  1. Turn ON the ignition, with the engine OFF.
  2. Turn both the front windshield and rear window wiper washer switches OFF.
Are the wipers OFF?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 Are the rear wipers always ON? Go to Step 4  Go to Step 7 
4
  1. The rear wipers are always ON.
  2. Turn OFF the ignition.
  3. Disconnect the rear wiper relay.
  4. Turn ON the ignition, with the engine OFF.
Are the rear wipers OFF?		 Go to Step 5  Go to Step 6 
5
  1. Turn OFF the ignition.
  2. Connect a test lamp between the rear wiper relay control circuit and the accessory voltage side of the rear wiper relay at the rear wiper relay socket terminals.
  3. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?		 Go to Step 8  Go to Step 16 
6 Test the rear window wiper motor control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 20  Go to Step 14 
7
  1. The front wipers are always ON.
  2. Turn OFF the ignition.
  3. Disconnect the harness connector of the windshield wiper washer switch.
  4. Turn ON the ignition, with the engine OFF.
Are the front wipers OFF?		 Go to Step 9  Go to Step 15 
8
  1. Turn OFF the ignition.
  2. Disconnect the harness connector C2 of the body control module (BCM).
  3. Connect a test lamp between the rear wiper switch signal circuit of the harness connector and a good ground.
  4. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?		 Go to Step 10  Go to Step 12 
9 Connect a test lamp between the windshield wiper switch pulse delay signal circuit of the harness connector and a good ground.
Does the test lamp illuminate?		 Go to Step 11  Go to Step 13 
10 Test the rear wiper switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 20  Go to Step 13 
11 Test the windshield wiper switch pulse delay signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 20  Go to Step 12 
12 Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 20  Go to Step 19 
13 Inspect for poor connections at the windshield wiper washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 20  Go to Step 18 
14 Inspect for poor connections at the rear wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 20  Go to Step 17 
15 Repair the windshield wiper motor high speed circuit or the windshield wiper motor low speed circuit for a short to voltage. Refer to Wiring Repairs and Connector Repairs .
Did you complete the repair?		 Go to Step 20  -
16 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 20  -
17 Replace the rear wiper motor. Refer to Wiper Motor Replacement .
Did you complete the replacement?		 Go to Step 20  -
18 Replace the windshield wiper washer switch. Refer to Turn Signal Multifunction Switch Replacement .
Did you complete the replacement?		 Go to Step 20  -
19 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 20  -
20 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
RENDER: 1.0x

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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.