Volt |
||||||||
|
|
• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Windscreen Washer Switch Signal | 2 | 1 | 1 | -- |
Washer Fluid Level Switch Signal | 4 | 3 | 3 | -- |
Windscreen Washer Fluid Pump Control | 1 | 1 | 2 | -- |
Windscreen Washer Relay Control | B3873 02 | 1 | 2 | -- |
Washer Fluid Level Switch Ground | -- | 3 | -- | - |
Windscreen Washer Fluid Pump Ground | -- | 1 | -- | -- |
1. Front Washer Inoperative. 2. Front Washer Always ON. 3. Washer Fluid Level Indicator Inoperative. 4. Washer Fluid Level Indicator Always ON. |
The body control module (BCM) controls the windscreen washer fluid pump based on an input from the wiper/washer switch. The BCM monitors the washer switch through the windscreen washer switch signal circuit. When the wash switch is closed, ground is supplied to the windscreen washer switch signal circuit. When this is the case, the BCM will command the windscreen washer fluid pump and the low speed wipers on.
On some vehicles, warning information (wash fluid low) will be conveyed via the GMLAN to the controls and displays subsystem (responsible for display). This subsystem will provide visual feedback to the customer while in the RUN power mode.
Wiper/Washer System Description and Operation
Control Module References for scan tool information
⇒ | If the reading does not change between INACTIVE and ACTIVE, refer to Windscreen Washer Switch Circuit Test. |
⇒ | If the windscreen washers do not turn ON and OFF, refer to Washer Pump Circut Test |
⇒ | If not above the minimum level, fill the reservoir and inspect for leaks. If the low washer fluid indicator is still ON, refer to Low Washer Fluid Indicator Test. |
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
⇒ | If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM. |
⇒ | If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the X50A underbonnet fuse block. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underbonnet fuse block. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the P16 instrument cluster. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster. |
⇒ | If not the specified value, replace the S82 Windscreen Wiper/Washer Switch. |
⇒ | If the G24 Windscreen Washer Pump does not activate, replace the G24 Windscreen Washer Pump. |
⇒ | If less than the specified value, test the control circuit for a short to ground. |
⇒ | If greater than the specified value, test the control circuit for an open/high resistance or a short to voltage. |
⇒ | If not the specified value, replace the B118B Windscreen Washer Fluid Level Switch. |
⇒ | If not the specified range, replace the B118B Windshield Washer Fluid Level Switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Relay Replacement : Within an Electrical Center → Attached to Wire Harness |
• | Control Module References for BCM replacement, setup, and programming |
©© Copyright Chevrolet. All rights reserved |