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Chevrolet Silverado / GMC Sierra. Manual - part 3005
Wiper High Speed Relay Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) monitors the wiper high speed relay control circuit only when
wiper high speed mode is active. When the wiper high speed mode is requested, the BCM
responds by applying a ground through the wiper high speed relay control circuit to the coil side
of the relay, energizing the WIPER SPEED relay.
Conditions for Running the DTC
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
Ground
-
1
-
-
1. Delay or Low Speed Wipers Inoperative
2. High Speed Wipers Inoperative
3. Wipers Do Not Park
4. Wipers Always ON
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
This DTC can set only when the output is actively being requested by the BCM.
Conditions for Setting the DTC
This DTC sets if the BCM detects a short to voltage on the wiper high speed relay control circuit.
Action Taken When the DTC Sets
The BCM will not activate the output.
Conditions for Clearing the DTC
The current DTC will become history when the request for the output is removed or when
the condition for setting the fault is corrected.
The 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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Ignition ON, wiper switch in the HIGH position. Verify the windshield wipers are cycling at the
high speed.
Circuit/System Testing
1. Ignition OFF, disconnect the X5 harness connector at the BCM.
2. Install a 10A fused jumper wire between B+ and the WIPER CONTROL relay control
circuit terminal 20.
3. Ignition ON, verify that the high speed wipers are not on.
If the high speed wipers are on, test the WIPER SPEED relay control circuit terminal
21 for a short to ground. If the circuit tests normal, replace the underhood fuse block.
4. Install a 10A fused jumper wire between the WIPER SPEED relay control circuit terminal
21 and ground. Verify the high speed wipers are on.
If the low speed wipers are not on, test the relay control circuit for a short to voltage
or an open/high resistance. If the circuit tests normal replace the underhood fuse block.
5. If all circuits test normal, replace the BCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Underhood Electrical Center or Junction Block Replacement
Control Module References for BCM replacement, setup, and programming
DTC B3922
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.
DTC Descriptor
DTC B3922 00
Front Wiper Function Select Circuit
Diagnostic Fault Information
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield
wiper washer switch. The BCM monitors the wiper washer switch through three separate signal
circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine
high speed wiper operation, the windshield wiper switch low signal is used to determine low
speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer
switch signal circuit is used to determine washer operation.
Conditions for Running the DTC
The ignition switch is in the ON position.
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
Ground
-
1
-
-
1. Delay or Low Speed Wipers Inoperative
2. High Speed Wipers Inoperative
3. Wipers Do Not Park
4. Wipers Always ON
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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