2005 Toyota 4Runner Owners Manual - Page 436

'05 4Runner_U (L/O 0504) Keys To protect items locked in the glove box when using valet parking, leave the sub key with the attendant. Since the side doors can be locked without a key, you should always carry a spare key in case you accidentally lock your keys inside the vehicle. Your vehicle is supplied with the two kinds of keys. 1. Master keys (black)-These keys work in every lock. Your Toyota dealer will need one of them to make a new key with a built- in transponder chip. 2. Sub key (gray)-This key does not work in the glove box. A transponder chip for engine immobilizer system has been placed in the head of the master and sub keys. These chips are needed to enable the system to function correctly, so be careful not to lose these keys. If you make your own duplicate key, you will not be able to cancel the system or start the engine. NOTICE When using a key containing a transponder chip, observe the following precautions: z When starting the engine, do not use the key with a key ring resting on the key grip and do not press the key ring against the key grip. Otherwise the engine may not start, or may stop soon after it starts. 12