Initial Inspection and Diagnostic Overview

1. The wiper washer system is a generic electronic module controlled system.
2. Verify the customer concern by operating the system in question.
3. Visually inspect for obvious signs of mechanical and electrical damage:

VISUAL INSPECTION CHART

Mechanical
^ Damaged switch(es)


Electrical
^ Fuse(s)
^ Damaged wiring hamess
^ Loose or corroded connections
^ Lamps
^ Circuitry

4. If the concern is not visually evident, retrieve continuous DTCs and perform an on-demand self-test. Record results and proceed to the Symptom Chart. Symptom Related Diagnostic Procedures

CAUTION:
^ Before removing and installing the GEM or its connectors, disconnect the battery. Failure to follow this caution will result in GEM storing many erroneous DTCs and it may exhibit erratic operation after installation.
^ Be careful when probing the fuse junction panel, power distribution box or any connectors. Damage will result to the connector receptacle if the probe or terminal being used is too large.

NOTE:
^ If unable to communicate with the GEM REFER to Information Bus.
^ If continuous DTCs are recorded and the symptom is not present when performing the pinpoint tests, and intermittent concern may be the cause. Always check for loose connections and corroded terminals.
^ Complete the entire pinpoint test related to the symptom before replacing the GEM.