Rain Sensor Fault

When Monitored: Ignition on.

Set Condition: When the BCM detects a fault from the Rain Sensor Module (RSM).

Possible Causes are:

Turn ignition on. Using the DRBIII(R), clear all BCM DTC's. Turn the right side multi-function switch to the AUTO position. Using the DRBIII(R), read the DTC information. Does the DRBIII(R) read: Rain Sensor Fault? If yes, go to next step. If no, the condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS.
Turn ignition off. Disconnect the right side multi-function switch harness connector. Turn ignition on. Using the DRBIII(R), select BODY, BODY CONTROL MODULE and read the multi-function switch voltage. Does the DRBIII(R) display voltage more than 4.75 volts? If yes, replace the right side multi-function switch. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS. If no, go to next step.
Turn ignition on. Turn the right side multi-function switch to the AUTO position. Using a spray bottle, spray water on the RSM area of the windshield. Using the DRBIII(R), monitor the wipe commands to the BCM from the RSM. Were any wipe commands transmitted to the BCM from the RSM? If yes, replace the Body Control Module. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS. If no, replace the Rain Sensor Module. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS.