Test C: DTC B1601 - The Passive Anti-Theft System (PATS) Received an Incorrect Key-Code From The Ignition Key Transponder

PINPOINT TEST C: DTC B1601 - THE PASSIVE ANTI-THEFT SYSTEM (PATS) RECEIVED AN INCORRECT KEY-CODE FROM THE IGNITION KEY TRANSPONDER

C1-C3:

C4-C7:

Normal Operation
The PATS transceiver communicates with the PATS key. During each vehicle start sequence, the PATS transceiver reads the PATS key identification code and sends the data to the instrument cluster. The instrument cluster will then send a message to the powertrain control module (PCM). The PCM will carry out the function of controlling engine enable. The instrument cluster initiates the key interrogation sequence when the key is turned to the ON or START position.

DTC B1601 - sets when there is an unprogrammed PATS key. The concern may not be with the PATS key itself, but possibly the key may need to be programmed into the PATS memory (unless the maximum number of keys are already programmed).

Possible Causes
- PATS key
- PATS transceiver
- Instrument cluster