Diagnostic Aids

DTC B3717 indicates a probable failure of the front wiper relay control circuit. However, the DTC will also set if the WIPER SYSTEM relay fails to supply battery positive voltage to the FRT WIPER relay. This failure may be due to an open FRT WIPER 25 amp fuse, or a malfunction of the WIPER SYSTEM relay or associated circuits. All wiper washer functions will be inoperative for both the front windshield and the rear window. If the fuse is open, a short to ground in any one of the following circuits may be the cause:

• Accessory voltage circuit
• Windshield washer pump control circuit
• Windshield wiper motor high speed circuit
• Windshield wiper motor low speed circuit
• Windshield wiper switch Mist/Off/Low signal circuit
• Windshield wiper switch pulse delay signal circuit
• Windshield wiper motor park switch signal circuit
• Rear wiper switch signal circuit
• Rear window washer pump control circuit

If there is no battery positive voltage supply to the FRT WIPER relay and an open FRT WIPER 25 amp fuse is not the cause, test the WIPER SYSTEM relay and associated circuits.