Fix of The Week 2/1/19

Fix of the week

 

Fix of The Week

Every week we’re posting our favorite head-scratchers and interesting mechanical issues submitted by our Direct-Hit customers.

For a chance to have something you’ve worked on appear as a Fix of the Week, and win a cool little prize for your shop, all you have to do is post your unique fixes in Direct-Hit. Just look up the vehicle you’re working on, click on Post Fix at the top right, then tell us the problem and what you did to fix it.

 

This Week’s Winners

On this edition of Fix of The Week: wonky turn signals on a Nissan, a loud blower motor in a Chevy, and no pedal response from a Hyundai.

 

2014 Nissan Altima – CARMAX

The vehicle’s turn signals all functioned normally with the headlamps/parking lamps off; however, the right side blinked fast with the headlamps/parking lamps on. Also, the right rear signal stayed illuminated with the headlamps/parking lamps on. No codes were set in BCM. 
We checked for power and ground at the right rear lamp harness. The turn signal should’ve been 12v flashing with hazards/signals on pin 3/brown wire. We checked for voltage with headlamps on only. Based on wiring diagrams alone, we thought was a wiring problem. Turns out the separate turn signal output wires from BCM are shared internally and not shown on wiring diagrams. We replaced R/F turn signal bulb—the front bulbs are a 2-filament bulb and internally shorted and had a single filament working for both parking lamp and turn signal.

 

2015 Chevrolet Silverado 1500 – Walt’s Service Center

The vehicle’s blower motor was making turbine kind of noises below 32 degrees. We found that there was an aftermarket cabin filter installed in the heating duct. A tech went to GM to order the factory cabin filter and the noises went away after installing (crazy, we know). The aftermarket cabin filter was too light and the blower was picking up the filter and hitting the blower fan cage, creating the noises.

 

2011 Hyundai Sonata Dinosaur Tire & Road Service

Under load, the vehicle would sometimes hesitate and have no accelerator pedal response. No codes were present in any system. Using the scan tool, we observed computer dropping APP input to 0% while voltages stayed at correct position. After extensive driving with the scan tool, we found that during times of no pedal response and 0% pedal position that the brake position switch was activated with no brake pedal input.  

We found when the brake pedal was lightly applied and released that switch would not return to close and the symptom of no pedal would be present. The position switch input would intermittently activate and cause the computer to drop pedal position to 0%. We replaced the worn pedal position switch and the vehicle was fixed. 

 

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