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| • | 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 Wiper High Speed Relay B+ | 1, 2 | 1, 2 | -- | -- |
Windscreen Wiper Switch Low Signal | 1 | 1 | 1 | -- |
Windscreen Wiper Switch High Signal | 4 | 2 | 2 | -- |
Windscreen Wiper Motor Park Switch Signal | 3 | 3 | -- | -- |
Front Wiper Relay Control | B3715 02 | 1, 2 | 4 | -- |
Windscreen Wiper High Speed Relay Control | B3875 02 | 2 | B3875 01 | -- |
Windscreen Wiper High Speed Relay Control | 2 | 2 | 4 | -- |
Front Wiper Motor Low Speed Control | 1 | 1 | 4 | -- |
Windscreen Wiper Switch Low Reference | -- | 1, 2 | 1, 2 | -- |
Windscreen Wiper Motor Ground | -- | 1, 2, 3 | -- | -- |
Front Wiper Relay Ground | -- | 1 | -- | -- |
1. Delay or Low Speed Wipers Inoperative 2. High Speed Wipers Inoperative 3. Wipers Do Not Park 4. Wipers Always ON | ||||
The body control module (BCM) controls the windscreen wiper motor based on input from the windscreen wiper/washer switch. The BCM monitors the wiper/washer switch through two separate signal circuits and a ground circuit. The windscreen wiper switch high signal circuit is used to determine high speed wiper operation, the windscreen wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windscreen washer switch signal circuit is used to determine washer operation.
The BCM controls the windscreen wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.
| • | The DTC runs only when a wiper output is actively being requested by the BCM. |
| • | The system voltage is between 9–16 V. |
| • | A short to ground is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit. |
| • | A short to voltage or an open/high resistance is detected in the High Speed Relay control circuit. |
The BCM will not activate the wiper output.
| • | A current DTC will clear when the condition for setting the fault is no longer present. |
| • | A history DTC will clear after 50 consecutive ignition cycles without a fault present. |
Wiper/Washer System Description and Operation
Control Module References for scan tool information
| ⇒ | 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 K9 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 K9 BCM. |
| ⇒ | If the test lamp does not illuminate and the circuit fuse is good, test or replace the underbonnet fuse block. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 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 K9 BCM. |
| ⇒ | If the resistance is not within the specified range, replace the relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If not the specified value, replace the relay. |
| ⇒ | If greater than the specified value, replace the relay. |
| ⇒ | If greater than the specified range, replace the relay. |
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, programming and setup |
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