Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
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(b) Measure the resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connectors connected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G36-19 (GND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the instrument panel junction block assembly connectors.
(d) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connectors disconnected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| MB-11 (GND1) - Body ground | - | Ground | Always | Below 1 Ω |
| MB-31 (BECU) - Body ground | - | Battery power supply | Always | 11 to 14 V |
| MB-30 (ACC) - Body ground | - | ACC power supply | Engine switch on (ACC) | 11 to 14 V |
| Engine switch off | Below 1 V | |||
| MB-32 (IG) - Body ground | - | IG power supply | Engine switch on (IG) | 11 to 14 V |
| Engine switch off | Below 1 V |
(e) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.
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(f) Measure the voltage and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| G38-4 (TSW) - Body ground | LG - Body ground | Luggage compartment door opening switch signal | Luggage compartment door opening switch on | Below 1 V |
| Engine switch off, all doors closed and luggage compartment door opening switch off | Pulse generation | |||
| G37-27 (TMSW) - Body ground | B - Body ground | Luggage door opening cancel switch signal | Luggage door opening cancel switch on | Below 1 V |
| Engine switch off, all doors closed and luggage door opening cancel switch off | Pulse generation | |||
| 3H-34 (LGCY) - Body ground | GR - Body ground | Luggage compartment door courtesy light switch assembly input signal | Luggage compartment door open | Below 1 V |
| Luggage compartment door closed | 11 to 14 V | |||
| 3H-20 (TR+) - Body ground | LA-G - Body ground | Luggage compartment door open relay output signal | Luggage compartment door opening switch on | 11 to 14 V |
| Luggage compartment door opening switch off | Below 1 V |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
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