B1662 — 5 documented meanings by make

B1662 does not mean the same thing on every car — manufacturers reuse the number for different faults. 6 makes document it: Chrysler, Ford, Hyundai, Kia, Mazda, Toyota. Find your make below.

B1662 on Chrysler

On Chrysler vehicles B1662 is documented as: Rear fog light control circuit.

Related Chrysler codes:

B1662 on Ford, Mazda

On Ford, Mazda vehicles B1662 is documented as: Driver's seat front up, short circuit to ground. B1662 is stored when the ECU sees short to ground on the circuit named in the code (front). That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.

Usually one of: Wiring insulation chafed through where the loom passes a bracket or edge; Water or salt in a connector bridging the signal pin to the body; The component itself shorted internally; A harness pinched during earlier repair work.

Check first, cheapest first:

1. Unplug the component and re-read the code — if it changes, the fault is in the component, not the wiring
2. Inspect the loom where it passes metal edges, brackets and hinges
3. Open the connector and check for green corrosion or moisture
4. Measure resistance from the signal pin to a body ground; near-zero confirms the short
5. Repair the harness section, or replace the component if it shorted internally

Related Ford, Mazda codes:

B1662 on Hyundai

On Hyundai vehicles B1662 is documented as: Driver's seat belt pretensioner deployment commanded. B1662 points at airbag / restraint system. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Hyundai codes:

B1662 on Kia

On Kia vehicles B1662 is documented as: Driver's seat belt pretensioner, crash recorded. B1662 points at airbag / restraint system. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Kia codes:

B1662 on Toyota

On Toyota vehicles B1662 is documented as: Indicator light circuit. B1662 points at lighting circuit. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Toyota codes:

Which one is yours

A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:

1. Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
2. Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
3. Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
4. If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.

Code family

B1xxx is body systems, manufacturer-specific.

Severity

Manufacturer-specific body system — needs a brand scanner to read the actual cause.

That is what holds for B1662 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.