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Chevrolet Silverado / GMC Sierra. Manual - part 3006
Conditions for Setting the DTC
The BCM detects a short to ground on the windshield wiper switch low signal circuit.
Action Taken When the DTC Sets
The BCM will not activate the low speed output.
The windshield wipers will only operate in the high speed mode.
Conditions for Clearing the DTC
The DTC will clear the current status when the condition for setting the fault is corrected.
A history DTC will clear after 50 consecutive ignition cycles without a fault present.
Reference Information
Schematic Reference
Wiper/Washer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Windshield Wiper Switch parameter while rotating the wiper
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
switch. The reading should change between Off, Intermittent, and Low.
Circuit/System Testing
1. Ignition OFF, disconnect the X3 harness connector at the turn signal multifunction switch.
2. Ignition ON, verify the scan tool Windshield Wiper Switch parameter is OFF.
If not the specified value, test the signal circuit terminal N for a short to ground. If the
circuit tests normal, replace the BCM.
3. If all circuits test normal, test or replace the turn signal multifunction switch.
Component Testing
Turn Signal Multifunction Switch
1. Ignition OFF, disconnect the X1 harness connector at the turn signal multifunction switch.
2. With the wiper switch in the HIGH position, test for less than 2 ohms between the low
reference terminal M and the signal terminal K.
If greater than the specified range, replace the windshield wiper washer switch.
3. While cycling the wiper switch through each delay and speed position, test for the specified
resistance between the low reference terminal M and the signal terminal N.
Wiper Switch Values
IMPORTANT: If the switch tests open in any switch position other than Off,
test the signal circuits for a short to voltage before replacing
the switch.
Switch Position
Resistance
Off
Infinite
Mist
300-364 ohms
Delay 1
3.48k-4.25k ohms
Delay 2
2.52k-3.08k ohms
Delay 3
1.78k-2.18k ohms
Delay 4
1.17k-1.44k ohms
Delay 5
697-851 ohms
Low
300-364 ohms
High
300-364 ohms
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
If any switch position is not within the specified range, replace the turn signal multifunction
switch.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Turn Signal Multifunction Switch Replacement
Control Module References for BCM replacement, setup, and programming
SYMPTOMS - WIPER/WASHER SYSTEMS
1. Perform Diagnostic System Check - Vehicle , in order to verify that all of the following
conditions are true:
No DTCs are set.
The control modules can communicate via the serial data link.
2. Review the system description and operation in order to familiarize yourself with the system
functions. Refer to Wiper/Washer System Description and Operation.
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the Windshield
Wiper/Washer System. Refer to Checking Aftermarket Accessories .
Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.
Inspect the washer fluid reservoir for the proper fluid level.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections .
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:
IMPORTANT: The following steps must be completed before using the symptom
tables:
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Windshield Wiper System Malfunction
Low Washer Fluid Indicator Malfunction
Washer Malfunction
Windshield Washer Solvent Heater Malfunction
Moisture Sensing Feature Inoperative
WINDSHIELD WIPER SYSTEM MALFUNCTION
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
WIPER SPEED Relay B+
1, 2
1, 2
-
-
Windshield Wiper Switch
Signal
B3922 00
1
1
-
Windshield Wiper Switch
High Signal
4
2
2
-
Windshield Wiper Motor Park
Switch Signal
3
3
-
-
WIPER CONTROL Relay
Control
B3715 02
1
4
-
WIPER SPEED Relay Control
4
2
B3875 00
-
Windshield Wiper Motor High
Speed Control
2
2
4
-
Windshield Wiper Motor Low
Speed Control
1
1
4
-
Windshield Wiper Switch Low
Reference
-
1, 2
1, 2
-
Windshield Wiper Motor
Ground
-
1, 2, 3
-
-
WIPER CONTROL Relay
-
1
-
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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