The Relay Coil Circuit Is Controlled by a Low-Side Driver

question 4

Multiple Choice

The relay coil circuit is controlled by a low-side driver. Direct battery feed is connected to the other terminal of the coil. If the BCM monitors voltage on the control circuit to determine proper operation, which of the following statements is not true?

• A) The voltage reading by the BCM before the low-side driver should be battery voltage with the coil turned off.
• B) The voltage reading by the BCM before the low-side driver should be close to 0 volts with the coil turned on.
• C) A constant low voltage reading by the BCM may be the result of an open in the circuit between the battery and the coil.
• D) The BCM will not be capable of setting control circuit faults.

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