• | 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 |
---|---|---|---|---|
Windshield Wiper Switch High Signal | 2 | 2 | 2 | -- |
Windshield Wiper Switch Low Signal | 3 | B3922 00 | 3 | -- |
Windshield Wiper Motor Park Switch Signal | 4 | 4 | -- | -- |
Windshield Wiper High Speed Relay Control | 2 | 2 | B3875 00 | -- |
Windshield Wiper Low Speed Relay Control | B3715 02 | 3 | 3 | -- |
Windshield Wiper Motor High Speed Control | 2 | 2 | 2 | -- |
Windshield Wiper Motor Low Speed Control | 3 | 3 | 3 | -- |
Windshield Wiper Washer Switch Ground | -- | 1 | 1 | -- |
Windshield Wiper Motor Ground | -- | 1 | 1 | -- |
Underhood Fuse Block Ground | -- | 1 | 1 | -- |
1. Wipers inoperative in all speeds 2. High speed wiper malfunction 3. Delay and/or low speed wiper malfunction 4. Wipers do not park |
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.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.
Wiper/Washer Connector End Views
Wiper/Washer System Description and Operation
⇒ | If not the specified value, refer to Washer Malfunction |
⇒ | If not the specified value, refer to Multifunction Switch Circuit Malfunction. |
⇒ | If not the specified value, refer to Multifunction Switch Circuit Malfunction. |
⇒ | If not the specified value, refer to Multifunction Switch Circuit Malfunction. |
⇒ | If not the specified value, refer to Multifunction Switch Circuit Malfunction. |
⇒ | If not the specified value, test or replace the Multifunction Switch. |
⇒ | If not the specified value, test or replace the Multifunction Switch. |
⇒ | If the wipers are not operating at the low speed, refer to Windshield Wiper Motor Circuit Malfunction. |
⇒ | If the wipers are not operating at the low speed, refer to Windshield Wiper Motor Circuit Malfunction. |
⇒ | If the delay does not change as specified, refer to Windshield Wiper Motor Circuit Malfunction. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit test normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the 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 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 BCM. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test or replace the underhood fuse block. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | 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 BCM. |
⇒ | If greater than the specified range, replace the underhood fuse block. |
⇒ | If greater than the specified range, test or replace the WPR relay. |
⇒ | If the test lamp does not illuminate, test or replace the underhood fuse block. |
⇒ | If the test lamp does not illuminate, replace the WPR relay. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the 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, test or replace the WPR HI relay. |
⇒ | 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, test or replace the WPR HI relay. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the WPR HI relay. |
⇒ | 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, test or replace the WPR HI relay. |
⇒ | If the test lamp does not illuminate, replace the BCM. |
⇒ | If greater than the specified range, replace the windshield wiper washer switch. |
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 |
⇒ | If any switch position is not within the specified range, replace the windshield wiper washer switch. |
⇒ | If the wiper motor is not in the low speed mode, replace the windshield wiper motor. |
⇒ | If the wiper motor is not in the high speed mode, replace the windshield wiper motor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure
• | Control Module References for BCM replacement, setup, and programming |
• | 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. |
The rear wiper is controlled based on an input from the rear wiper/washer portion of the multifunction switch. When closed, the wiper ON and wiper DELAY switches provide a unique voltage signal to the rear window wiper motor indicating the desired speed. Each switch has a unique resistor that drops the voltage to a specified value which is interpreted by the rear window wiper motor as ON or DELAY. The rear wiper motor receives B+ voltage from the I/P fuse block and accessory voltage from the BCM.
Wiper/Washer Connector End Views
Rear Wiper/Washer System Description and Operation
⇒ | If the rear wiper does not activate, refer to Rear Wiper Malfunction |
⇒ | If the delay rear wiper does not activate, refer to Rear Wiper Delay Malfunction |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Power Mode Mismatch . |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test he B+ circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test he ignition circuit for a short to ground or an open/high resistance. |
⇒ | If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the multifunction switch. |
⇒ | If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the multifunction switch. |
⇒ | If not the specified value, replace the multifunction switch. |
⇒ | If not within the specified range, replace the multifunction switch. |
⇒ | If not within the specified range, replace the multifunction switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure