Tech Tip: Volvo S60 with parking assist issues

Customer came into a repair shop concerned that their parking assist wasn't working.

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Aug. 13, 2024

2 min read

The owner of a 2014 Volvo S60 came into the repair shop concerned that the parking assist wasn't working and there was a park assist fault message on the instrument cluster.

Case details

When the technician connected a scanner, he found numerous diagnostic trouble codes (DTCs) in the PAM (park assist module):

B1B4414- Communication with the parking sensor, external, right rear
B1B4614- Communication with the parking sensor, inner, right rear
B1B4814- Communication with the parking sesnor, external, left rear
B1B5014- Communication with the parking sensor, inner, left rear
B1B5811- PAM checks the voltage supply to the rear parking sensors
B1B3614- Communication with the parking sensor, external, right front
B1B3814- Communication with the parking sensor, inner, right front
B1B4014- Communication with the parking sensor, external, left front
B1B4214- Communication with the parking sensor, inner, left front
B1B5711- PAM checks the voltage supply to the front parking sensors

Given the number of DTCs, the technician called ALLDATA Tech-Assist for some time-saving diagnostic advice.

The Tech-Assist consultant recommended checking for corrosion in any of the parking assist sensors. NOTE: One bad sensor might short the reference voltage for the others, which could trigger all the DTCs and cause the system malfunction.

If all the sensors checked out well, the next step would be to inspect the wiring and connectors for the PAM. If all those were okay, then the PAM would likely be the problem.

The technician inspected the sensors and connectors as suggested, and they all were good.

He opened the PAM and found some burned components inside.

Confirmed repair

The technician replaced the PAM and cleared all the DTCs. After that, the parking assist system worked normally. Problem solved!

About the Author

ALLDATA Tech-Assist Team

The ALLDATA Tech-Assist Diagnostic team is a group of top-notch ASE Master Technicians who have devoted numerous years to the automotive industry as independent shop and dealership technicians, shop owners and a many of them have also been automotive instructors.

Each team member is passionate about helping technicians of all skill levels get vehicles diagnosed and repaired quickly and correctly the first time. Because they help diagnose such a large number of vehicles every day, they are a wealth of experience-based diagnostic knowledge.