Which of the following statements about wiper system diagnostics are correct?

• A. Some wiper systems will set a diagnostic trouble code.
• B. A faulty control module always requires replacement.
• C. Both statements are correct.
• D. Neither statement is correct.

Answer: (C)

Wiper system diagnostics rely on fault reporting and the handling of control hardware. When a fault occurs in the wiper circuit, many systems will log a diagnostic trouble code in the vehicle’s controller memory so a technician can read it with a scan tool. This helps pinpoint issues such as motor stalls, intermittent operation, or sensor/wiring faults.

The wiper control module, which coordinates the motor, park function, and related signals, is typically not serviceable at the component level. When that module is the source of the problem, the usual course of action is replacement rather than repair, because tampering with or repairing the internal electronics is not commonly feasible. In practice, this means a faulty module often has to be replaced, and software or firmware updates may be used in some cases but do not change the fundamental need for a replacement when the module itself has failed.

So both statements describe common aspects of how wiper systems are diagnosed and serviced: faults can trigger a diagnostic trouble code, and a faulty control module is generally replaced.