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Jeepers Creepers [E184]
Manage episode 479927764 series 3320033
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Thanks to our Partner, NAPA Autotech Training
Key Points & Takeaways:
The Problem:
- A 2023 Jeep Grand Cherokee (collision repair) came in with blind spot warning and parking aid malfunction lights on.
- No functionality in either system post-repair.
Initial Diagnosis:
- Verified the concern (instrument cluster lit up with warnings).
- Used an aftermarket scan tool (Snap-on Ultra) and found:
- ADAS control module had multiple DTCs for open/short circuits on all radar sensors.
- Parking aid module had similar codes for ultrasonic sensors.
- Vehicle was hit in the passenger rear, leading to replacement of the bumper, harness, and rear hatch.
Suspected Causes:
- Blown fuse (common culprit for multiple system failures).
- Crushed/damaged wiring harness (common after collisions).
- Module failure due to impact.
Testing & Findings:
- Checked power and ground at the ADAS module—all good.
- Inspected wiring harness for damage (no visible issues).
- Critical Clue: Wire colors didn’t match the schematic.
- Initially dismissed as a common schematic error.
- Later realized the entire harness was installed backward (left/right sides flipped).
The Fix:
- Flipped the harness and radar modules to their correct positions.
- All codes cleared except two for the blind spot radars—turned out they were also swapped.
- After correction, all systems worked perfectly.
Lessons Learned:
- Don’t get stuck in a diagnostic rabbit hole. Good techs pivot when clues don’t add up.
- Man-made problems can be the trickiest. Always verify previous work (especially after collisions).
- Wire color discrepancies matter. Even if schematics are often wrong, they can reveal bigger issues.
- "Slow down to speed up." Rushing leads to wasted time; methodical checks save hours.
Final Thoughts:
- Awareness is key. Catch yourself when fixating on one theory.
- Experience can work against you. Stay open to new clues, even if they conflict with past patterns.
Contact Information
- Email Matt: [email protected]
- Diagnosing the Aftermarket A - Z YouTube Channel
- Subscribe & Review: Loved this episode? Leave a 5-star review on Apple Podcasts and Spotify
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