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Practice questions · 310S G

Diagnoses and repairs restraint systems, body components, accessories and trim

2 questions from this exam area, each with the full explanation shown — not just the answer. Free, no account.

8% of the exam

1

A vehicle's airbag warning light stays on after a minor fender repair. A scan tool shows code B0100 (front airbag sensor circuit). What is the most likely cause?

  1. The clockspring needs replacement
  2. A wiring connector to the front impact sensor was left disconnected during repairAnswer
  3. The airbag module has expired
  4. The SRS fuse is blown

Why that is right

Code B0100 flags an open or fault in the front airbag sensor circuit, and because fender repair commonly disturbs that front impact sensor connector, a connector left unplugged during the repair is the most likely cause.

Why the other options are wrong

  • The clockspring needs replacement — The clockspring is in the steering column and feeds the driver airbag; a fault there would set a different code, not the front sensor circuit code B0100.
  • The airbag module has expired — Airbag modules do not set an 'expired' code; B0100 is a circuit fault, not a lifespan issue.
  • The SRS fuse is blown — A blown SRS fuse would disable the whole system and typically set a broader power/supply fault rather than a single front sensor circuit code.

2

A technician is using a scan tool to diagnose a security system fault. The scan tool is able to read data from the BCM and the DDM (Driver Door Module). This indicates:

  1. The key fob transmitter is faulty.
  2. The BCM has a faulty ground.
  3. The vehicle's data network is functional.Answer
  4. The door lock actuator is seized.

Why that is right

Successfully reading live data from multiple modules (the BCM and the DDM) proves the scan tool's connection and the vehicle's data network wiring are intact and communicating, so the data bus itself is functional.

Why the other options are wrong

  • The key fob transmitter is faulty. — A scan tool communicates over the data bus and does not test the RF signal transmitted by the key fob, so successful module communication says nothing about the fob's transmitter.
  • The BCM has a faulty ground. — A module with a faulty ground would generally fail to communicate at all; the fact the BCM responds indicates its power and ground are adequate for network operation.
  • The door lock actuator is seized. — A seized door lock actuator is a mechanical/output fault; reading data over the network does not exercise or test the actuator's mechanical operation.

Exam-style practice written to the published Red Seal standard. These are not real exam questions — the official Red Seal sample questions are deliberately excluded from everything we publish.

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