System Diagram
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.
Transponder key ECU
TRANSPONDER KEY ECU
| Transmitting ECU (Transmitter) | Receiving ECU (Receiver) | Signals | Communication method |
|---|---|---|---|
| Body ECU | Transponder key ECU assembly | ACC signal | BEAN |
| Body ECU | Transponder key ECU assembly | Driver side courtesy light switch signal | BEAN |
| Combination meter | Transponder key ECU assembly | Vehicle data (Key want registration number) | BEAN |
| DLC 3 | Transponder key ECU assembly | Diagnosis tool requisition | BEAN |
| DLC 3 | Transponder key ECU assembly | Diagnosis erasure | BEAN |
| Transponder key ECU assembly | Body ECU | Immobilizer data (Set or Unset) | BEAN |
| Transponder key ECU assembly | Body ECU | Security indicator signal (Immobilizer) | BEAN |
| Transponder key ECU assembly | Body ECU | Security indicator signal (Registration) | BEAN |
| Transponder key ECU assembly | Body ECU DLC 3 | Diagnosis tool requisition | BEAN |