Chrysler Ypsilon 846 airbag control unit repair

What is a Chrysler Ypsilon 846 airbag control unit?

The airbag control unit is the central control unit of the restraint system (SRS) in the Chrysler Ypsilon 846. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners deploy. After an accident it stores crash data and locks itself.

The control unit also continuously monitors the entire restraint system. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

The Chrysler Ypsilon 846 (2011 to 2015) is fitted with a control unit supplied by Bosch. It works together with the sensors and the squib circuits of the airbags and seatbelt pretensioners.

Why is the Chrysler Ypsilon 846 airbag control unit defective?

The most common cause is crash data stored after an accident, even if no airbag deployed. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes from a weak battery or jump-starting.

A normal diagnostic tool cannot delete this crash data. The control unit therefore stays in a fault state even after the accident damage has been repaired.

Without an accident, the cause is usually ageing and environmental influences. Solder joints lose strength over the years, and penetrating moisture makes contacts corrode. Voltage spikes put additional strain on the electronics.

Typical signs are a permanently lit airbag warning light, a fault memory that cannot be cleared, and a diagnostic tool that cannot connect.

Common error codes for Chrysler Ypsilon 846 airbag control unit repair

You read error codes from the fault memory with a diagnostic tool. In the Chrysler Ypsilon 846, they indicate internal control unit faults, lost communication, interrupted squib circuits or sensor faults.

So first you read out the fault memory, then you match the codes. These codes occur on this vehicle:

• B2208 → Internal fault in the airbag control unit
• B2207 → Second internal fault in the airbag control unit
• U0151 → Communication with the airbag control unit lost
• B1B02 → Driver airbag squib circuit 1 interrupted
• B1B06 → Passenger airbag squib circuit 1 interrupted
• B1BA6 → Internal fault in the front impact sensor

A code alone does not reliably show that the control unit is defective. Connectors, wiring or an airbag module can also be the cause. Only testing clarifies where the fault lies. Please enclose the printout of the read-out with the unit you send in.

What part numbers are available for the Chrysler Ypsilon 846 airbag control unit repair?

The part number is on the label of the control unit. It determines the exact version, because within a model series there are different numbers depending on equipment and year of manufacture.

These part numbers are known for the Chrysler Ypsilon 846, although the list does not have to be complete:

• 51833230 (Bosch)
• 51939105 (Bosch)
• 52052831 (Bosch)

Compare the number on your unit with this list. This only ensures that it is the right unit. Whether it is defective is shown only by reading out the fault memory or by testing.

After that, it goes like this: disconnect the battery, remove the control unit, create a repair order online and send in the unit. Processing at Airbag24, with checking, repairing and testing, usually takes 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.