Diagnostic Routine G
Diagnostic Routine G
Diagnostic Overview
The Rain Sensitive Wipers Do Not Operate
Refer to Wiring Diagram Set 81 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
REFER to Rain Sensitive Wipers . An internal failure of the rain sensor module or a circuit failure in the power, ground or communication circuits causes the rain sensitive wipers to default to the normal intermittent settings.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
Make sure BCM (Body Control Module) fuse 62 (5A) is OK.
Pinpoint Test
1. CHECK FOR BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)
1. Ignition ON.
2. Using a scan tool, carry out the BCM (Body Control Module) self-test.
Are any BCM (Body Control Module) DTCs (Diagnostic Trouble Codes) present?
2. CHECK THE BCM (Body Control Module) WIPER/WASHER SWITCH PIDs (Parameter Identifications)
1. Using a scan tool, view the following BCM (Body Control Module) PIDs (Parameter Identifications):
- Wiper Stalk Illegal Combination (WPR_SW_ICOM)
- Wiper Stalk Stuck Position or Button (WPR_SW_STK)
2. While monitoring the PIDs (Parameter Identifications), position the wiper/washer switch into each of the windshield wiper INT positions.
Does either PID (Parameter Identification) display TRUE when the wiper/washer switch is in any of the INT positions?
3. VERIFY THE RAIN SENSOR IS INSTALLED CORRECTLY
1. Ignition OFF.
2. From the outside of the vehicle, inspect the area of the windshield glass where the rain sensor is mounted. The rain sensor contact area should appear black, with no bubbles or air pockets.
Is the rain sensor installed correctly?
4. CHECK FOR WINDSHIELD DAMAGE
1. Inspect the windshield glass for any cracks, pits, chips or other visible damage around the area of the rain sensor.
Is there any damage to the windshield around the area of the rain sensor?
5. CHECK FOR WINDSHIELD GLASS STREAKING
1. Ignition ON.
2. Turn the wiper/washer switch to the LOW speed position while applying water to the windshield surface. Observe the wipe quality, especially around the area of the rain sensor.
Is any streaking present on the windshield around the area of the rain sensor?
6. ISOLATE THE WINDSHIELD WIPER BLADES FOR STREAKING
1. Ignition OFF.
2. Clean the windshield glass with glass cleaner.
3. Clean the wiper blades with isopropyl alcohol swabs. Wipe the entire length of the wiper blades.
4. Ignition ON.
5. Turn the wiper/washer switch to the LOW speed position while applying water to the windshield surface. Observe the wipe quality, especially around the area of the rain sensor.
Was there a noticeable improvement in the wipe quality after cleaning the glass and wiper blades?
7. CHECK FOR CORRECT RAIN SENSOR OPERATION
1. Turn the wiper/washer switch to INT 5 position (most sensitive to moisture) while applying water to the windshield surface. Observe the wiper operation.
Do the wipers operate when water is applied to the windshield surface?
8. CHECK THE RAIN SENSOR VOLTAGE CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect Rain Sensor electrical connector.
3. Ignition ON.
4. Measure:
Is the voltage greater than 11 volts?
9. CHECK THE RAIN SENSOR GROUND CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Measure:
Is the resistance less than 3 ohms?
10. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect Rain Sensor electrical connector (if not previously disconnected).
3. Disconnect BCM (Body Control Module) C2280H.
4. Measure:
Is the resistance less than 3 ohms?
11. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
12. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition ON.
2. Measure:
Is voltage present?
13. CHECK THE RAIN SENSOR FOR CORRECT OPERATION
1. Ignition OFF.
2. Disconnect and inspect the Rain Sensor electrical connector (if not previously disconnected).
3. Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Connect the Rain Sensor electrical connector. Make sure it seats and latches correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
