Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK LUGGAGE CLOSER MOTOR ASSEMBLY
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(a) Disconnect the R7 luggage closer motor assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| R7-8 (IG) - Body ground | LA-B - Body ground | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| R7-10 (ECUB) - Body ground | LA-W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| R7-12 (B) - Body ground | B - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| R7-11 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the R7 luggage closer motor assembly connector.
(d) 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 |
|---|---|---|---|---|
| R7-1 (LCM-) - Body ground | L - Body ground | Luggage compartment door lock motor lock drive output | Power trunk lid close operating | 11 to 14 V |
| Power trunk lid not operating | Below 1 V | |||
| R7-2 (LCM+) - Body ground | LG - Body ground | Luggage compartment door unlock motor lock drive output | Power trunk lid open operating | 11 to 14 V |
| Power trunk lid not operating | Below 1 V | |||
| R7-4 (LDDN) - Body ground | GR - Body ground | Door control switch input | Door control switch on | Below 1 V |
| Door control switch off | 11 to 14 V | |||
| R7-7 (HAF) - Body ground | V - Body ground | Half latch switch input | Luggage compartment door fully open | Below 1 V |
| Luggage compartment door half latched → fully close | 11 to 14 V | |||
| R7-20 (PAWL) - Body ground | P - Body ground | Pawl switch input | Luggage compartment door fully open → fully close | 11 to 14 V → Below 1 V → 11 to 14 V |
| Luggage compartment door fully close → fully open | 11 to 14 V → Below 1 V → 11 to 14 V | |||
| R7-21 (SWG) - Body ground | L - Body ground | Half latch switch and pawl switch ground | Luggage compartment door fully open | Below 1 V |
| Luggage compartment door half latched → fully close | 11 to 14 V | |||
| R7-16 (CSG) - Body ground | W - Body ground | Luggage door closer assembly (pulse sensor) ground | Always | Below 1 Ω |
| R7-17 (CS2) - Body ground | B - Body ground | Luggage door closer assembly (pulse sensor) signal | Luggage door closer assembly operating | Pulse generation (See waveform 1) |
| R7-18 (CS1) - Body ground | G - Body ground | Luggage door closer assembly (pulse sensor) signal | Luggage door closer assembly operating | Pulse generation (See waveform 2) |
| R7-19 (CSV) - Body ground | R - Body ground | Luggage door closer assembly (pulse sensor) power supply | Always | 7 V or higher |
| R7-24 (KSIN) - Body ground | L - Body ground | Kick door control sensor input | Kick door control sensor not detecting a foot → detecting a foot | Pulse generation (See waveform 3) |
(1) Using an oscilloscope, check waveform 1.
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Waveform 1 (Reference) | Item | Condition |
|---|---|
| Tester connection | R7-17 (CS2) - Body ground |
| Tool setting | 2 V/DIV, 10 ms/DIV. |
| Vehicle condition | Luggage door closer assembly operating |
HINT:
The period changes in accordance to the speed at which the luggage compartment door is opened and closed.
(2) Using an oscilloscope, check waveform 2.
Waveform 2 (Reference)| Item | Condition |
|---|---|
| Tester connection | R7-18 (CS1) - Body ground |
| Tool setting | 2 V/DIV, 10 ms/DIV. |
| Vehicle condition | Luggage door closer assembly operating |
HINT:
The period changes in accordance to the speed at which the luggage compartment door is opened and closed.
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(3) Using an oscilloscope, check waveform 3.
Waveform 3 (Reference)| Item | Condition |
|---|---|
| Tester connection | R7-24 (KSIN) - Body ground |
| Tool setting | 2 V/DIV, 50 ms/DIV. |
| Vehicle condition | Kick door control sensor not detecting a foot → detecting a foot |
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| *a | Kick detection signal |
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.
| 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.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| MB-11 (GND1) - Body ground | - | Ground | Always | Below 1 Ω |
| MB-30 (ACC) - Body ground | - | ACC power supply | Power switch on (ACC) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| MB-31 (BECU) - Body ground | - | Auxiliary battery power supply | Power switch off | 11 to 14 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 input | Trunk and fuel switch assembly (luggage compartment door opening switch) on | Below 1 V |
| Power switch off, all doors closed and trunk and fuel switch assembly (luggage compartment door opening switch) off | Pulse generation | |||
| G38-27 (TMSW) - Body ground | B - Body ground | Luggage door opening cancel switch assembly input | Luggage door opening cancel switch assembly on | Below 1 V |
| Power switch off, all doors closed and luggage door opening cancel switch assembly off | 11 to 14 V |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
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READ NEXT:
Dtc Check / Clear
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Diagnostic Trouble Code Chart
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