DTC B1602: Invalid Format Key Code From Ignition Key Transponder
WARNING: This page is about a different car, the 1998 Mercury Mountaineer and 1998 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Retrieve DTCs Turn ignition off. Using NGS tester, retrieve and document continuous DTCs. Clear continuous DTCs and perform PATS On-Demand Self-Test. If DTC B1602 is retrieved, go to next step. If DTC B1602 is not retrieved, system is operating properly. Check all customer encoded ignition keys with PATS On-Demand Self-Test to verify all others keys are programmed.
- Replace PATS Transceiver Module Turn ignition off. Replace PATS transceiver module. See TRANSCEIVER MODULE under REMOVAL & INSTALLATION. Using customers original encoded ignition key, turn ignition to RUN position. Perform PATS On-Demand Self-Test. If DTC B1602 is retrieved, go to next step. If DTC B1602 is not retrieved, system is operating properly. If other DTCs are retrieved, perform appropriate DTC test for trouble code received.
- Replace Encoded Ignition Key Obtain a NEW encoded ignition key. Program NEW key. Perform KEY PROGRAMMING - WITHOUT PROGRAMMED KEYS . Perform PATS On-Demand Self-Test. If any DTCs are retrieved, perform appropriate DTC test for trouble code retrieved. If no DTCs are retrieved, system is operating properly.