Toyota Verso AR10 airbag control unit repair

What is a Toyota Verso AR10 airbag control unit?

The Toyota Verso AR10 airbag control unit is the central control unit of the restraint system (SRS). In an accident, it decides within milliseconds, based on the crash sensors, which airbags and seatbelt pretensioners to fire; during normal operation it monitors the system and reports faults via the airbag warning light.

Its most important task shows in an emergency: if a sensor reports a severe impact, the control unit enables the appropriate firing circuits, and does so faster than a person could react. It is installed in the Toyota Verso AR10 (2004 to 2009); it comes from ZF TRW.

As long as nothing happens, it continuously checks the connected sensors, firing circuits and wiring, and switches on the warning light in the instrument cluster as soon as it detects a fault. If an accident has occurred, it stores crash data and locks itself.

Why is the Toyota Verso AR10 airbag control unit defective?

A Toyota Verso AR10 airbag control unit is usually defective because crash data was stored after an accident, even if no airbag deployed. Other possible causes are ageing of the electronics, cold solder joints, moisture with corrosion at the connectors, and voltage spikes (for example from a weak battery or jump-starting).

These crash data cannot be removed with an ordinary diagnostic tool. That is why the light stays on, even when nothing on the outside points to the accident any more.

Regardless of an accident, time works against the electronics: components age, solder joints crack, and contacts oxidise as soon as moisture reaches the connectors. A voltage surge in the vehicle electrical system can also damage sensitive circuits in the unit.

A defect usually shows itself like this: the airbag warning light stays on permanently, the fault memory cannot be reset, or the diagnostic tool cannot establish contact with the control unit.

Common error codes for Toyota Verso AR10 airbag control unit repair

For the Toyota Verso AR10 airbag control unit, the codes point to faults in the control unit itself, interrupted communication, faulty firing circuits or problems with occupant detection. Which code appears depends on the system area that detects the fault.

These messages are in the fault memory when there is a fault:

• B1000 → Central sensor assembly of the airbag system faulty
• B1100 → Internal fault in the airbag control unit
• U0151 → Communication with the airbag control unit lost
• B1800 → Driver airbag firing circuit faulty
• B1805 → Passenger airbag firing circuit faulty
• B1650 → Occupant detection fault

The codes are read out with a diagnostic tool. A single code does not mean that the control unit itself has failed, as a broken cable, a loose connector or an airbag module can also be the cause. Only an inspection gives certainty.

What part numbers are available for the Toyota Verso AR10 airbag control unit repair?

You will find the part number on the label of your control unit; it determines the exact version. Depending on equipment and year of manufacture, the numbers differ within the same model series, so you should know the number of your Toyota Verso AR10 airbag control unit.

We know of these numbers; the list is not exhaustive:

• 89170-0F022
• 89170-0F031
• 89170-0F050 (ZF TRW)
• 89170-0F070
• 89170-0F080 (ZF TRW)

Compare the number of your unit with this list. This only ensures that it is the right unit; whether there is a defect is only established by reading out the fault memory or by the inspection.

This is how you get to the repair: first have the fault memory read out, disconnect the battery and remove the control unit. Then create a repair order online and send in the unit. At Airbag24, 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.