B1695 - Supply voltage too high airbag control unit fault

What does error code B1695 mean in the airbag control unit?

Error code B1695 reports that the supply voltage of the airbag control unit is above the permitted range, so it concerns the power supply of the control unit itself. The control unit stores this fault in the fault memory and switches on the airbag warning light, so the finding is directly visible in the vehicle.

The airbag control unit controls the restraint systems (SRS) in the vehicle and also monitors its own supply voltage for this purpose. If that voltage is too high, the control unit records the fault in its memory.

The meaning relates to the voltage at the control unit. The underlying cause is only revealed by an inspection at a specialist workshop.

How do you recognise error code B1695?

You recognise error code B1695 by an airbag warning light that stays on permanently, because the code is stored in the control unit's fault memory. It cannot be permanently cleared, so it reappears after being cleared, and it is only read out with a diagnostic tool that makes the entry visible.

The airbag warning light is the visible sign that the airbag control unit has stored a fault. Do not try to clear the entry yourself; instead, have the fault memory read out at a specialist workshop.

What causes error code B1695?

Error code B1695 may have its cause in the airbag control unit itself or in the power supply that feeds the control unit, that is, in the battery, the vehicle's electrical system or the unit itself. The causes range from a weak battery to age-related faults in the control unit.

• A weak battery that causes voltage spikes in the vehicle's electrical system.
• Jump-starting, during which voltage spikes occur.
• Ageing electronic components in the airbag control unit.
• Solder joints in the control unit.
• Moisture or corrosion in the control unit.

Only an inspection at a specialist workshop shows which cause is actually present.

In which vehicles does error code B1695 occur?

Error code B1695 is known for BYD vehicles, including the Atto 2, Atto 3, Dolphin, Dolphin Surf, Han, Seal, Seal 5, Sealion 7 and Tang 2 models. The list is not complete, and the meaning of the code may differ for other vehicles.

The information refers to the BYD make. Whether the code is actually present in your vehicle is shown by reading it out with a diagnostic tool.

How is error code B1695 resolved?

First have the fault memory read out with a diagnostic tool, so that it is clear where the cause lies. If the cause is in the airbag control unit itself, disconnect the battery, remove the control unit and send it to Airbag24 with a repair order created online.

If the cause is not in the control unit but in the power supply, for example in cables or connectors to the battery, have these checked at a specialist workshop first. Work on the airbag system should be left to qualified specialists.

Checking, repairing and testing usually take 3–4 working days.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.