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Left side and trunk is completely out. I’m thinking it’s a fuse but having a hard time figuring out which fuse is for tail lights. Can anyone spare some advice?
 

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1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar. There are no dedicated fuses for the taillamps. The left and right sides are controlled independently through the BCM.
If the BCM senses a problem in one side, it can shut off power to that side for protection, store a useful fault code and run tests. You may need a capable scan tool (i.e. - WiTech2 or equivalent) to properly diagnose this.

From the service manual:
"Conventional diagnostic methods will not prove conclusive in the diagnosis of the exterior lighting system or the electronic controls or communication between modules and other devices that provide some features of the exterior lighting system. The most reliable, efficient and accurate means to diagnose the exterior lighting system or the electronic controls and communication related to exterior lighting system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information".

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1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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BCM failure/replacement would be the last house on the block.
Always diagnose first. Anything else would be a guess.
Some 'possible' rear lamp fault codes:

  • B1642-11-REAR LEFT TURN LAMP CONTROL-CIRCUIT SHORT TO GROUND
  • B1642-15-REAR LEFT TURN LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN
  • B1646-11-REAR RIGHT TURN LAMP CONTROL-CIRCUIT SHORT TO GROUND
  • B1646-15-REAR RIGHT TURN LAMP CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN
  • B16AF-11-LEFT STOP LAMP CONTROL - CIRCUIT SHORT TO GROUND
  • B16AF-15-LEFT STOP LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN
  • B16B3-11-RIGHT STOP LAMP CONTROL - CIRCUIT SHORT TO GROUND
  • B16B3-15-RIGHT STOP LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN
  • B16B7-11-CENTER STOP LAMP CONTROL-CIRCUIT SHORT TO GROUND
  • B16D7-11-LEFT TAILLAMP 1 CONTROL - CIRCUIT SHORT TO GROUND
  • B16D7-15-LEFT TAILLAMP 1 CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN
  • B16DF-11-RIGHT TAILLAMP 1 CONTROL - CIRCUIT SHORT TO GROUND
  • B16DF-15-RIGHT TAILLAMP 1 CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN
  • B16E7-11-LICENSE PLATE LAMP CONTROL-CIRCUIT SHORT TO GROUND
  • B16E7-15-LICENSE PLATE LAMP CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN
  • B1792-11-LEFT REAR LAMP DIAGNOSTIC LINE - CIRCUIT SHORT TO GROUND
  • B1793-11-RIGHT REAR LAMP DIAGNOSTIC LINE - CIRCUIT SHORT TO GROUND
 
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Okay, what did you do to fix it or did it just start working on it's own?
 

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1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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A fault code would still be in module memory whether the symptom were present or not.
The code would be considered 'stored' and not 'active'.
 
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