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Top Tip - BMW

F2x F3x Heating and Air conditioning Lin bus faults

Issue

 
There are Lin bus faults stored and various heater issues.

Cause

Lin bus faults, due to wiring shorting out on dash support bracket.

Action

 
  1. Perform a fault code check and function test of IHKA operations.
  2. Confirm Lin bus fault, and remove dash for access to area of possible short circuit.
  3. Repair damaged wire, and protect from chaffing by rerouting and applying a protective strip to the metal support.

 

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