Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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(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 | - | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| MB-30 (ACC) - Body ground | - | ACC power supply | Power switch on (ACC) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| MB-32 (IG) - Body ground | - | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power 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 |
| Power 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 |
| Power 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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Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
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