Lexus ES manuals

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

-

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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 Components

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 Inspection

INSPECTION PROCEDURE 1. INSPECT LUGGAGE DOOR OPENING SWITCH (TRUNK AND FUEL SWITCH ASSEMBLY) (a) Check the switch. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 4 (B) - 3 (L) Pressed (On)

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