B1649 — meaning by make (3 makes)

B1649 does not mean the same thing on every car — manufacturers reuse the number for different faults. 3 makes document it: Chrysler, Ford, Mazda. Find your make below.

B1649 on Chrysler

On Chrysler vehicles B1649 is documented as: Rear right turn light control circuit open. B1649 is stored when the ECU sees open circuit on the circuit named in the code (rear right). That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it.

Related Chrysler codes:

B1649 on Ford, Mazda

On Ford, Mazda vehicles B1649 is documented as: Driver's seat recline forward, short circuit to positive. B1649 is stored when the ECU sees short to positive on the circuit named in the code. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it.

Related Ford, Mazda 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.

That is what holds for B1649 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.