Problem Symptoms Table

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

ENGINE IMMOBILIZER SYSTEM

Symptom	Suspected area	See
Hybrid control system does not start	1. ECU power source circuit	ECU POWER SOURCE CIRCUIT
	2. Unlock warning switch assembly	DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction
	3. Key (Transponder chip)	DTC B2793 Transponder Chip Malfunction
	4. Key (Unmatched encryption code)	DTC B2794 Unmatched Encryption Code
	5. Key (Unmatched key code)	DTC B2795 Unmatched Key Code
	6. Key (No communication)	DTC B2796 No Communication in Immobilizer System; DTC B2798 Communication Malfunction No. 2
	7. Key (Communication malfunction)	DTC B2797 Communication Malfunction No. 1
	8. Transponder key amplifier (Antenna coil)	DTC B2784 Antenna Coil Open / Short
	9. Transponder key amplifier (No communication)	DTC B2796 No Communication in Immobilizer System; DTC B2798 Communication Malfunction No. 2
	10. Transponder key amplifier (Communication malfunction)	DTC B2797 Communication Malfunction No. 1
	11. Transponder key ECU assembly (Unlock warning switch)	DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction
	12. Transponder key ECU assembly (Antenna coil)	DTC B2784 Antenna Coil Open / Short
	13. Transponder key ECU assembly (No communication)	DTC B2796 No Communication in Immobilizer System; DTC B2798 Communication Malfunction No. 2
	14. Transponder key ECU assembly (Communication malfunction)	DTC B2797 Communication Malfunction No. 1
	15. Transponder key ECU assembly (Engine immobilizer system malfunction)	DTC B2799-542 Engine Immobilizer System Malfunction; DTC B2799-790 Engine Immobilizer System Malfunction
	16. Transponder key ECU assembly (ECU power source circuit)	ECU Power Source Circuit
	17. Hybrid vehicle control ECU (Engine immobilizer system malfunction)	DTC B2799-542 Engine Immobilizer System Malfunction; DTC B2799-790 Engine Immobilizer System Malfunction