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Pinpoint Test C: Wiper System Faults - Circuit And Electrical Checks

  1. C1: CHECK FOR WIPER PARK SIGNAL CIRCUIT ISSUES 
    1. Check if the wiper motor fault is related to a fault with the wiper park signal circuit

    During the functional/enhanced tests, do the wipers initially operate normally and then stop working after 6 seconds?

    • Yes  : Check the wiper park signal circuit GO to  C2.
    • No  : Check the wiper motor connector GO to   C3  .
  2. C2: WIPER PARK SIGNAL CIRCUIT CHECKS 
    1. Refer to the appropriate system wiring diagram and check the signals from the front wiper park switch circuit (input to central junction box pin C1BP02E-24). The signal should toggle between ground (when the wipers are in the park position) and a value between 11-14 volts (when the wipers are in any other position)

    Is the wiper park signal present and behaving as expected?

    • Yes  : Consult the symptom chart below and perform any appropriate corrective actions. If the fault returns, contact the JLR Service Helpdesk
    • No  : Check the wiper motor connector GO to  C3.
  3. C3: WIPER MOTOR CONNECTOR CHECKS 
    1. Uncouple the connector to the wiper motor assembly and check for corroded or poorly positioned pins

    Is there any evidence of damaged, bent or corroded pins?

    • Yes  : Rectify as required. Re-couple the connector and perform wiper motor functional tests GO to Pinpoint Test B .
    • No  : Check the wiper motor power supply and ground circuits GO to  C4.
  4. C4: WIPER MOTOR POWER SUPPLY AND GROUND CIRCUIT CHECKS 

    1. Refer to the appropriate system wiring diagram and check the wiper motor ground circuit for open circuit, high resistance (resistance should be less than 0.05 ohms

    2. Refer to the appropriate system wiring diagram and check the wiper motor slow wipe power supply circuit (between the wiper motor assembly pins 2 and 4) for short circuits or open circuit, high resistance
    3. Refer to the appropriate system wiring diagram and check the wiper motor fast wipe power supply circuit (between the wiper motor assembly pins 1 and 4) for short circuits or open circuit, high resistance

    Are the wiper motor power and ground circuits intact and operating as expected?

    • Yes  : Replace the wiper motor assembly
    • No  : Repair circuit(s) as required and retest. If the fault persists, contact the JLR Service Helpdesk
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