Chrysler Vision LH airbag control unit repair

What is a Chrysler Vision LH airbag control unit?

The airbag control unit in the Chrysler Vision LH is the central control unit of the restraint system (SRS) and makes sure that sensors, control unit and airbags work together. It evaluates the signals from the crash sensors, decides within milliseconds in an accident whether to deploy airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

It all starts with the sensors: they detect deceleration and impact forces and pass the signals on to the control unit. The control unit assesses them and, if necessary, releases the firing of the airbags and seatbelt pretensioners. The airbags themselves only carry out the command; the control unit makes the decision.

The control unit is fitted in the Chrysler Vision LH (1993 to 1997). It continuously monitors all connected parts of the system and indicates faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why is the Chrysler Vision LH airbag control unit defective?

The most common cause of a defective Chrysler Vision LH airbag control unit is crash data stored after an accident, even if no airbag was deployed. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

The stored crash data cannot be deleted with an ordinary diagnostic tool. The control unit stays locked, and the airbag warning light signals this. Over the years, components on the circuit board can also age, and solder joints lose their connection. If moisture gets in, contacts corrode and the signals become unreliable. Voltage spikes, for example from a weak battery or jump-starting, can also damage the electronics.

Typical signs are an airbag warning light that stays on permanently, a fault memory that cannot be cleared, or a diagnostic tool that cannot connect to the control unit.

Common error codes for Chrysler Vision LH airbag control unit repair

The error codes for this airbag control unit point to communication faults, internal faults in the control unit, interrupted firing circuits and faults in the frontal impact sensor. They give a first indication of which part of the system is affected.

The list shows the codes known to us for this vehicle. They relate to communication with the control unit, internal faults, the firing circuits of the front airbags and the frontal impact sensor.

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

Error codes are read from the fault memory with a diagnostic tool. A code on its own does not prove that the control unit is defective: connectors, wiring or an airbag module can also be the cause. Only the inspection clarifies where the fault really lies.

What part numbers are available for the Chrysler Vision LH airbag control unit repair?

The part number of your Chrysler Vision LH airbag control unit is printed on the label of the unit and determines the exact version. Within one model series there are different numbers depending on equipment and year of manufacture, so it is worth checking the label before sending the unit in.

The list contains part numbers known to us for this vehicle. It makes no claim to completeness.

• P04759742

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

The route to repair is short: first have the fault memory read out, disconnect the battery and remove the control unit. Then create a repair order online and send the unit in. Processing at Airbag24, including inspection, repair 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.