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Diagnostic Trouble Code Chart

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 trouble code is displayed during the DTC check, check the circuit listed for that code.

  1. TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART 
    TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART

    DTC No. Detection Item Trouble Area
    B2780  Push Switch / Key Unlock Warning Switch Malfunction
    1. Unlock warning switch assembly
    2. Wire harness
    3. Transponder key ECU assembly
    B2784  Antenna Coil Open / Short
    1. Transponder key amplifier
    2. Wire harness
    3. Transponder key ECU assembly
    B2793  Transponder Chip Malfunction 1. Key
    B2794  Unmatched Encryption Code 1. Key
    B2795  Unmatched Key Code 1. Key
    B2796  No Communication in Immobilizer System
    1. Key
    2. Transponder key amplifier
    3. Wire harness
    4. Transponder key ECU assembly
    B2797  Communication Malfunction No. 1
    1. Key
    2. Transponder key amplifier
    3. Wire harness
    4. Transponder key ECU assembly
    B2798  Communication Malfunction No. 2 1. Key
  2. HYBRID VEHICLE CONTROL ECU DIAGNOSTIC TROUBLE CODE CHART 
    HYBRID VEHICLE CONTROL ECU DIAGNOSTIC TROUBLE CODE CHART

    DTC No. Detection Item Trouble Area
    B2799-542  Engine Immobilizer System Malfunction
    1. Wire harness
    2. Transponder key ECU assembly
    3. Hybrid vehicle control ECU
    B2799-790  Engine Immobilizer System Malfunction
    1. Wire harness
    2. Transponder key ECU assembly
    3. Hybrid vehicle control ECU
    NOTE: The DTC for the immobilizer system is specified above. If other codes are output, check the DTC chart for the hybrid control system.
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