Rain Sensor Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Rain Sensor B+
|
1
|
1
|
-
|
-
|
Rain Sensor Signal
|
B370A 39
|
B370A 39
|
B370A 39
|
B370A 39
|
Rain Sensor Indicator Signal
|
2
|
2
|
2
|
-
|
Rain Sensor Ground
|
-
|
1
|
-
|
-
|
|
1. |
Rain Sensor Malfunction. |
|
2. |
Rain Sense Indicator Malfunction. |
|
|
| |
Circuit/System Description
B+ voltage is supplied to the windshield outside moisture
sensor. Whenever the ignition is ON, or in accessory positions, the
body control module (BCM), sends the turn signal/multifunction
switch status by using a pulse width modulated (PWM) signal. When a
wipe cycle is needed, the windshield outside moisture sensor sends
a PWM voltage signal to the BCM, requesting the wiper operation.
The BCM commands the windshield wiper motor wipe cycles. If at
anytime a fault occurs between the windshield outside moisture
sensor and BCM, the BCM will use the inputs from the turn
signal/multifunction switch in the delay positions to operate the
windshield wiper motor at continuous variable delay intervals.
Reference Information
Schematic Reference
Wiper/Washer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Verification
Ignition ON, S82 Windshield Wiper/Washer Switch in the low
position. Spray some water on the windshield. The windshield wipers
should operate at low speed.
If the windshield wipers do not operate, refer to
Windshield Wiper System Malfunction .
Circuit/System Testing
Rain Sensor Malfunction
| 1. |
Ignition OFF, Retained
Accessory Power OFF, disconnect the harness connector at the B117
Rain Sensor. |
| 2. |
Test for less than 5 Ω
between the ground circuit terminal 2 and ground. |
| ⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
| 3. |
Ignition ON, verify that a
test lamp illuminates between B+ voltage circuit terminal 1 and
ground. |
| ⇒ |
If the test lamp does not illuminate, test the B+
voltage circuit for a short to ground or an open/high
resistance. |
| 4. |
Ignition ON, test for 4-12 V
between the signal circuit terminal 3 and ground. |
| ⇒ |
If not the specified range, test the signal
circuit for an open/high resistance and a short to voltage. If the
circuit tests normal, replace the K9 Body Control Module. |
| 5. |
If all circuits test normal,
replace the B117 Rain Sensor. |
Rain Sensor Indicator Malfunction
| 1. |
Ignition ON, command the
Driver Information Center Segments test ON and OFF with the scan
tool, verify that the rain sensor display reacts to ON and OFF
positions. |
| ⇒ |
If the rain sensor display stays always ON or
always OFF, test the signal circuit for an open/high resistance or
a short to voltage. |
| ⇒ |
If the signal circuit tests normal, replace the
P16 Instrument Cluster. |
| 2. |
If the rain sensor display
changes between ON and OFF, replace the B117 Rain Sensor.
|
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
