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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Wiper System & Washer System) >> Diagnostic Tests >> Wipers & Washers >> Pinpoint Tests >> Pinpoint Test A: The Wipers are Inoperative

Pinpoint Test A: The Wipers are Inoperative

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Wipers and Washers for schematic and connector information.

Normal Operation 

The windshield wiper motor receives battery voltage from the battery junction box (BJB) through circuit 2025 (RD/YE), and voltage from the central junction box (CJB) through circuit 65 (DG) when the ignition switch is in the RUN or ACC position. The windshield wiper motor is grounded through circuit 676 (PK/OG) and circuit 57 (BK). The windshield wiper motor receives open and ground inputs from the multi-function switch through circuits 56 (DB/OG), 58 (WH), 61 (YE/RD) and 63 (RD). When a wiper function is selected, the multi-function switch grounds 1 of several combinations of these 4 circuits. The windshield wiper motor interprets these ground signals and performs the action requested. The multi-function switch is grounded through circuit 57 (BK).

This pinpoint test is intended to diagnose the following:

PINPOINT TEST A: THE WIPERS ARE INOPERATIVE 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 CHECK CIRCUITS 65 (DG) AND 2025 (RD/YE) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Windshield Wiper Motor C125
    • Key in ON position.
      • Fig 1: Checking Circuits For Voltage
      GF0013264Courtesy of FORD MOTOR CO.
    • Measure the voltage between windshield wiper motor C125-5, circuit 2025 (RD/YE), harness side and ground; and between windshield wiper motor C125-8, circuit 65 (DG), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  A2.
    2. NO  : VERIFY the BJB fuse 110 (30A) and the CJB fuse 7 (10A) are OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  2. A2 CHECK CIRCUITS 57 (BK) AND 676 (PK/OG) FOR OPENS 
    • Key in OFF position.
      • Fig 2: Checking Circuit For Open
      G03880805Courtesy of FORD MOTOR CO.
    • Measure the resistance between windshield wiper motor C125-6, circuit 57 (BK), harness side and ground; and between windshield wiper motor C125-3, circuit 676 (PK/OG), harness side and ground.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A3.
    2. NO  : REPAIR the circuit(s) in question. TEST the system for normal operation.
  3. A3 CHECK THE MULTI-FUNCTION SWITCH 
    • Disconnect: Multi-function Switch C202b
    • Carry out the multi-function switch component test. Refer to appropriate COMPONENT TESTING article.
    • Does the multi-function switch pass the component test? 
    1. YES  : Go to  A4.
    2. NO  : INSTALL a new multi-function switch. REFER to STEERING COLUMN SWITCHES article.
  4. A4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0013265Courtesy of FORD MOTOR CO.
    • Measure the resistance between multi-function switch C202b-5, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK FOR SHORTS IN THE WINDSHIELD WIPER MOTOR HARNESS 
    • Measure the resistance at the windshield wiper motor electrical connector between the circuits shown in the table.
      Windshield Wiper Motor C125 Windshield Wiper Motor C125
      Pin 10, circuit 56 (DB/OG) Pin 11, circuit 58 (WH)
        Pin 1, circuit 61 (YE/RD)
        Pin 9, circuit 63 (RD)
      Pin 11, circuit 58 (WH) Pin 1, circuit 61 (YE/RD)
        Pin 9, circuit 63 (RD)
      Pin 1, circuit 61 (YE/RD) Pin 9, circuit 63 (RD)
    • Is the resistance greater than 10,000 ohms for all measurements? 
    1. YES  : Go to  A6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. A6 CHECK FOR CORRECT WIPER MOTOR OPERATION 
    • Disconnect all wiper motor connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all wiper motor connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new windshield wiper motor. REFER to Wiper Motor .
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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