SureTrack Real Fix: Visual Inspection
Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair records and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version or in our ShopKey Pro product.
Here’s another fix where the cause of an electrical gremlin was not found by traditional means but instead by looking all around the vehicle. Follow this Real Fix to see how a Ford F150 with malfunctioning radio and climate control system was diagnosed and the component that caused the problem was found.
2016 Ford F-150 Lariat 3.5L
Radio and HVAC inoperative, replaced taillight.
The technician reports that the radio and heating, ventilation and air conditioning (HVAC) will operate correctly when in the “key on, engine off” (KOEO) state, but stops working in the “key on, engine running” (KOER) state. When this occurs, the technician reports that the radio touch screen will light up but will not respond, and no communication can be established between the scanner and the radio module.
The technician reviewed the system wiring diagrams and visually checked the wiring for faults, but found none. Used a multi-meter to verify that power and ground were present at the radio and both were present. Pulled the floor carpet up to inspect the body wiring harness and look for any signs of water intrusion. No issues were found. Noticed there was standing water in one of the taillight assemblies, originating from a cracked tail light lens. Discovered that water had infiltrated the tail light module within the tail light assembly. This caused corrosion and moisture issue, which affected the communication with other modules on the communication bus.
Replaced the tail light assembly and verified that the vehicle’s radio and air conditioning system worked properly after the repair.
SureTrack® adds to the power of ShopKey Pro with an exclusive combination of expert knowledge and detailed parts replacement records, all wrapped in an interactive community. Designed to help automotive shops increase accuracy and efficiency from diagnosis to completed repair, the industry’s most comprehensive repair information resource is just a few clicks away.
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