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What is the reason for the BMW 740 reporting an invalid rear axle steering angle signal?

1 Answers

DelAdeline

07/30/25 9:02am

After receiving the vehicle, connect to ISID for diagnostic testing as follows: 480154 - IcM: HSR control module reports a fault; 48f)38c - Rear axle lateral deviation adjustment: motor position sensor value is not credible; 480:388 - Rear axle lateral deviation adjustment actuator: a line fault is identified. This 740Li (parameters and pictures) is equipped with integrated active steering control, which includes Active Steering Control (AL) and Rear Axle Lateral Deviation Adjustment (HSR). The HSR control module is installed in the trunk recess. The HSR controls the servo motor in the rear axle lateral deviation adjustment actuator. A temperature sensor in the HSR control module monitors the final stage of the servo motor. A motor position sensor and a steering tie rod position sensor are installed in the actuator. The signals from these sensors are analyzed by the HSR control module. The HSR control module is connected to FlexRay via the Active Steering Control (AL) control module. The following components are installed in the actuator: servo motor, motor position sensor, steering tie rod position sensor. The electromechanical actuator consists of a servo motor, which moves two steering tie rods through a screw drive mechanism, and the steering tie rods are connected to the follower steering arm.

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