FRONT

WARNING: To avoid serious or fatal injury, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

If the front wiper motor operates, but the wipers do not move on the windshield, replace the ineffective front wiper module. If the washer pump/motor operates, but no washer fluid is dispensed on the glass; or, if the wipers operate, but chatter, lift, or do not clear the glass, clean and inspect the front wiper and washer system components as required. (Refer to 8 - ELECTRICAL/WIPERS/WASHERS - CLEANING - FRONT) and (Refer to 8 - ELECTRICAL/WIPERS/WASHERS - INSPECTION - FRONT).

The hard wired front wiper and washer system circuits and components may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the front wiper and washer system or the electronic controls or communication between other modules and devices that provide some features of the front wiper and washer system. The most reliable, efficient, and accurate means to diagnose the front wiper and washer system or the electronic controls and communication related to front wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

NOTE: The front wiper and washer switches are integral to the right multi-function switch. The right multi-function switch is hard wired to the left multi-function switch/Steering Control Module (SCM), which communicates with the ElectroMechanical Instrument Cluster (EMIC)/Cab Compartment Node (CCN) over the Local Interface Network (LIN) data bus. Before performing any of the following tests, determine whether the other functions of the right and left multi-function switch/SCM are operational. If only the right multi-function switch functions are inoperative, test and repair the right multi-function switch or the jumper harness between the right and left multi-function switches before attempting to repair the Front Wiper and Washer System. If both the right and left multi-function switch/SCM functions are ineffective, diagnose and repair that problem before attempting to repair the Front Wiper and Washer System.


CONDITION
  		 POSSIBLE CAUSES
  		 CORRECTION
  
WIPER MOTOR DOES NOT OPERATE IN ANY SWITCH POSITION
  		 1. Ineffective motor ground circuit.
  		 1. Test and repair open wiper motor ground circuit if required.
  
2. Ineffective motor feed circuits.
  		 2. Test and repair low speed and high speed feed circuits between TIPM and front wiper motor if required.
  		  
3. Ineffective EMIC (CCN) inputs or outputs.
  		 3. Use a diagnostic scan tool to test the EMIC (CCN) inputs and outputs. Refer to the appropriate diagnostic information.
  		  
4. Ineffective TIPM inputs or outputs.
  		 4. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information.
  		  
5. Ineffective wiper motor.
  		 5. Test and replace open or shorted wiper motor as required.
  		  
WIPER MOTOR OPERATES SLOWLY IN ALL SWITCH POSITIONS
  		 1. Ineffective wiper motor.
  		 1. Check amperage draw with linkage disconnected from wiper motor crank arm. Correct draw should be about 6 amperes. If incorrect, refer to the appropriate Possible Cause that follows:
  
2. Amperage draw too low.
  		 2. Test and repair shorted low and high speed feed circuits if required.
  		  
3. Amperage draw too high.
  		 3. With linkage disconnected from wiper motor crank arm check linkage and pivots for binding. If binding is detected, repair or replace front wiper module if required. If no linkage binding detected, replace the front wiper motor if required.
  		  
WIPERS RUN AT HIGH SPEED WITH SWITCH LOW SPEED SELECTED OR AT LOW SPEED WITH SWITCH HIGH SPEED SELECTED
  		 1. Ineffective motor feed circuit wiring.
  		 1. Test and repair low speed and high speed feed circuits between TIPM and front wiper motor if required.