Pinpoint Test A: The Wipers Are Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

A1 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCs)
- Retrieve and document continuous DTCs.
- Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
- Enter the following diagnostic mode on the diagnostic tool: SJB Wiper/Washer Self-Test.
- Are DTCs recorded?
- Yes : If DTC B1431 only, GO to A2.
  If DTC B1432 only, GO to A4.
  
  If DTC B1431, B1434, B1458 and B1840, VERIFY the smart junction box fuse 5 (30A) is OK. If OK, GO to A5.
- No : GO to A6.
A2 CHECK THE VOLTAGE TO THE WIPER RUN/PARK RELAY
- Key in OFF position.
- Disconnect: Wiper Run/Park Relay.
- Key in ON position.
- Measure the voltage between ground and wiper run/park relay pin 1, circuit 1671 (RD).
  
  Fig 1: Measuring Voltage Between Relay Socket And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : CARRY OUT the run/park relay component test. Refer to the appropriate SYSTEM WIRING DIAGRAMS for component testing. If the relay tests OK, GO to A3.
- No : REPAIR circuit 1671 (RD) for an open. TEST the system for normal operation.
A3 CHECK CIRCUIT 646 (YE/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: C2280a.
- Measure the resistance between SJB C2280a-17, circuit 646 (YE/WH) and wiper run/park relay pin 2, circuit 646 (YE/WH).
  
  Fig 2: Checking Circuit 646 (YE/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A11.
- No : REPAIR circuit 646 (YE/WH) for an open. TEST the system for normal operation.
A4 CHECK CIRCUIT 646 (YE/WH) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: Wiper Run/Park Relay.
- Disconnect: SJB C2280a.
- Key in ON position.
- Measure the voltage between ground and wiper run/park relay pin 2, circuit 646 (YE/WH).
- Is voltage present?
- Yes : REPAIR circuit 646 (YE/WH) for a short to voltage. TEST the system for normal operation.
- No : GO to A11.
A5 CHECK THE VOLTAGE TO THE RELAY COILS
- Key in OFF position.
- Disconnect: Wiper Run/Park Relay.
- Disconnect: Wiper High/Low Relay.
- Disconnect: Washer Relay.
- Key in ON position.
- Measure the voltage between ground and:
  - Wiper run/park relay pin 1, circuit 1671 (RD).
  - Wiper high/low relay pin 1, circuit 1671 (RD).
    
    Fig 4: Measuring Voltage Between Relay Socket And Ground
    Courtesy of FORD MOTOR CO.
- Measure the voltage between ground and:
  - Washer relay pin 2, circuit 1671 (RD).
    
    Fig 5: Checking Voltage To Relay Coils - Washer Relay Pin 2
    Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : GO to A11.
- No : REPAIR circuit 1671 (RD) for an open. TEST the system for normal operation.
A6 CHECK THE GROUND TO THE WIPER MOTOR
- Key in OFF position.
- Disconnect: Wiper Motor C125.
- Measure the resistance between ground and wiper motor C125-3, circuit 57 (BK).
  
  Fig 6: Checking Ground To Wiper Motor
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A7.
- No : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
A7 CHECK THE VOLTAGE TO THE WIPER MOTOR
- Key in ON position.
- Place the wipers in LOW.
- Measure the voltage between ground and wiper motor C125-2, circuit 58 (WH).
  
  Fig 7: Checking Voltage To Wiper Motor
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new wiper motor. REFER to MOTOR - WINDSHIELD WIPER . TEST the system for normal operation.
- No : GO to A8.
A8 CHECK THE VOLTAGE TO THE WIPER RUN/PARK RELAY SWITCH
- Key in OFF position.
- Disconnect: Wiper Run/Park Relay.
- Key in ON position.
- Measure the voltage between ground and wiper run/park relay pin 5, circuit 1671 (RD).
  
  Fig 8: Checking Voltage To Wiper Run/Park Relay Switch
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : CARRY OUT the run/park and high/low relay component tests. Refer to the appropriate SYSTEM WIRING DIAGRAMS for component testing. If the relays test OK, GO to A9.
- No : REPAIR circuit 1671 (RD) for an open. TEST the system for normal operation.
A9 CHECK CIRCUIT 28 (BK/PK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Wiper High/Low Relay.
- Measure the resistance between wiper run/park relay pin 3, circuit 28 (BK/PK) and wiper high/low relay pin 3, circuit 28 (BK/PK).
  
  Fig 9: Checking Circuit 28 (BK/PK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A10.
- No : REPAIR circuit 28 (BK/PK) for an open. TEST the system for normal operation.
A10 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Multi-function Switch C202a.
- Measure the resistance between ground and multi-function switch C202a-6, circuit 57 (BK).
  
  Fig 10: Checking Circuit 57 (BK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : CARRY OUT the multi-function switch component test. Refer to the appropriate SYSTEM WIRING DIAGRAMS for component testing. If the switch tests OK, GO to A11.
- No : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
A11 CHECK FOR CORRECT SJB OPERATION
- Disconnect all SJB connectors.
- Check for:
  - Corrosion.
  - Pushed-out pins.
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES .
  CLEAR the DTCs, REPEAT the self-test.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.