Saturday, July 20, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 699


Circuit/System Description



The windshield washer function is controlled by the body control module (BCM). When the washer switch is pressed, ground is applied through the



switch contacts and the signal circuit to the BCM indicating the wash request. The BCM then applies ground through the control circuit to the coil



side of the WSH Relay energizing the relay. With the relay energized, battery voltage from the WPR fuse is applied through the switch contacts of



the relay, the WSW/PUMP Fuse, and the control circuit to the windshield washer fluid pump.



Conditions for Running the DTC



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 in the windshield washer pump 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 (See: Wiper and Washer Systems/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Wiper/Washer System Description and Operation (See: Wiper and Washer Systems/Description and Operation/Wiper/Washer System Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Operate the washers using the WASH switch. Verify the washer pump activates.



Circuit/System Testing



1. Ignition OFF, disconnect the X4 harness connector at the BCM.



2. Ignition ON, verify the windshield washer pump is not on.



锟斤拷 If the windshield washer pump is on, test the windshield washer pump relay control circuit terminal 15 for a short to ground. If the circuit



tests normal replace the underhood fuse block.



3. Install a 10A fused jumper wire between the relay control circuit terminal 15 and ground. Verify the windshield washer pump is on.



锟斤拷 If the windshield washer pump is 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.



4. If all circuits test normal, replace the BCM.

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