2020 GC Trailer lights - fuse NOT blown - JeepForum.com
 
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post #1 of 3 Old 07-30-2021, 05:33 PM Thread Starter
Emichael
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Join Date: Feb 2020
Location: Scappoose
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2020 GC Trailer lights - fuse NOT blown

I've got a problem with the trailer lights which seems to have caused an electrical problem with the Grand Cherokee's wiring. Some sort of short in the parking lights, and fixing the trailer is a different issue.

Problem is I did NOT blow the fuse on the GC. I have pulled fuse F29 (Trailer Tow Parking Lights) and confirmed it is good with a multi-tester. I also put my multi-tester on the factory 4-prong plug. I get 12v for left/right turn/brake, but I get nothing on the parking light pin.

Is there some sort of relay or control box in the circuit that I may have damaged?

Thank you for any assistance or advice you can provide.

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post #2 of 3 Old 07-30-2021, 06:48 PM
ColdCase
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I don't have the wiring diagram handy for the 2020, but check on the TIPM. It controls the trailer lights, if it detects a fault, I don't think it will send power to the circuit.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #3 of 3 Old 07-30-2021, 08:20 PM
ColdCase
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The early models had a plug in relay in the TIMP between the battery and the fuse. Perhaps the 2020 is similar. Check if you have voltage at the fuse terminals. Check for voltage at the relay terminals. The relay is controlled by TIPM logic which has a sense on the + side of the fuse and which may not activate the relay if it senses an issue on the park lamp feed (like a short). There many be an error code stored which your everyday OBD scanner won't read. So check the voltage at the fuse, if there is voltage when the fuse is removed but not when inserted, then there is probably a problem in the harness. Sometimes disconnecting the battery(s) ground for 5 minutes will reset things.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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