› Remove the cover cap from the mounting re- cess. › Insert the key into the lock. › Turn the key. The green mark  A  must point upwards or the eye- let  B  must point downwards. The red mark or eyelet must be pointing upwards. Inserting tow bar Inserting Setting the ready position ✓ The key cannot be removed or turned to another position. ✓ The red mark on the key  C  is pointing upwards (applies to key variant 1). The key loop  C  points upwards (applies to key variant 2). ✓ The release bolt  B  can be moved freely. ✓ The operating lever  A  is locked in the lower posi- tion. › Remove the cap from the lock. A Protective cap B Ball rod C Operating lever D Lock cap E Operating lever release bolt F Lock G Locking balls H Key - Variant 1 I Key - Variant 2 › Push the release bolt in as far as it will go, while at the same time pressing the operating lever as far as it will go. 144 Roof rack and hitch ›  Removable tow coupling Ball rod Prerequisites for installing the tow bar The operating lever remains locked in this position.