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If the test lamp is always ON, test the control circuit for a short to voltage. If the If the test lamp is always OFF, test the control circuit for a short to ground or an 7. If all circuits test normal, replace the windshield wiper motor. 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 Windshield Wiper Motor Dynamic Test 1. Ignition OFF, disconnect the harness connector at the windshield wiper motor. 2. Install a 25-amp fused jumper wire between B+ and the control terminal 1. Install a jumper wire between the terminal 5 and ground. IMPORTANT: If the switch tests open in any switch position other than Off, test the signal circuits for a short to voltage before replacing 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
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. The wiper motor should be in low speed mode. If the wiper motor is not in the low speed mode replace the motor. 4. Install a 25-amp fused jumper wire between B+ and the control terminal 4. Install a jumper wire between the terminal 5 and ground. 5. The wiper motor should be in the high speed mode. If the wiper motor is not in the high speed mode replace the motor. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Turn Signal Multifunction Switch Replacement Windshield Wiper System Module Replacement Underhood Electrical Center or Junction Block Replacement Control Module References for BCM replacement, setup, and programming LOW WASHER FLUID INDICATOR 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/System Description The Check Washer Fluid message is controlled by the instrument panel cluster using an input Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Low Washer Fluid Switch 1 2 2 - Low Reference - 2 - - 1. Low washer fluid message always displayed
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
switch is normally open so the instrument cluster detects ignition voltage on the washer fluid level Reference Information Schematic Reference Instrument Cluster 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 Testing 1. Ignition OFF, disconnect the harness connector at the washer fluid level switch. 2. Test for less than 1.0 ohm of resistance between the ground circuit terminal A and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. Ignition ON, verify the scan tool Washer Fluid Level parameter is OK. If not the specified value, test the signal circuit terminal B for a short to ground. If the 4. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool Washer Fluid Level parameter is Low. If not the specified value, test the signal circuit for a short to voltage or an open/high 5. If all circuits test normal, test or replace the washer fluid level switch. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Windshield Washer Solvent Level Switch Replacement (GMC) or Windshield Control Module References for IPC replacement, setup, and programming WASHER 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 Windshield Washer Switch 2 1 1 - Windshield Washer Fluid 1 1 2 - Windshield Washer Relay 2 1 B3873 00 - Windshield Washer Switch - 1 - - Windshield Washer Fluid - 1 - -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Wipers and Washers - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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