Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

(a) Disconnect the J28 outer mirror control ECU assembly (driver door) connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J28-14 (BDR) - Body ground

GR - Body ground

+B power supply

Always

11 to 14 V

J28-6 (CPUB) - Body ground

LA-L - Body ground

+B power supply

Always

11 to 14 V

J28-5 (SIG) - Body ground

LA-B - Body ground

Ignition power supply

Engine switch off → on (IG)

Below 1 V → 11 to 14 V

J28-7 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the J28 outer mirror control ECU assembly (driver door) connector.

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

z20-3 (MR) - Body ground

G - Body ground

Power retract mirror motor drive voltage

Outer rear view mirror assembly (driver door) being retracted

11 to 14 V

Outer rear view mirror assembly (driver door) stopped

Below 1 V

z20-11 (MF) - Body ground

L - Body ground

Power retract mirror motor drive voltage

Outer rear view mirror assembly (driver door) returning

11 to 14 V

Outer rear view mirror assembly (driver door) stopped

Below 1 V

z20-1 (MV) - z20-10 (M+)

W - B

Vertical mirror motor drive voltage

Driver door mirror surface moving upward → stopped

11 to 14 V → Below 1 V

z20-10 (M+) - z20-1 (MV)

B - W

Vertical mirror motor drive voltage

Driver door mirror surface moving downward → stopped

11 to 14 V → Below 1 V

z20-10 (M+) - z20-9 (MH)

B - R

Horizontal mirror motor drive voltage

Driver door mirror surface moving right → stopped

11 to 14 V → Below 1 V

z20-9 (MH) - z20-10 (M+)

R - B

Horizontal mirror motor drive voltage

Driver door mirror surface moving left → stopped

11 to 14 V → Below 1 V

z20-5 (VC) - z20-14 (E1)

SB - GR

Mirror position sensor power supply

Engine switch on (IG)

4.55 to 5.45 V

Engine switch off

Below 1 V

z20-6 (VSRL) - J28-7 (GND)

V - W-B

Mirror position sensor signal

Engine switch on (IG)

0 to 5 V

z20-13 (HSRL) - J28-7 (GND)

LG - W-B

Mirror position sensor signal

Engine switch on (IG)

0 to 5 V

z20-4 (H+) - z20-12 (GND)

BR-W - BR

Mirror heater relay drive voltage

Mirror heater switch (rear window defogger switch) on

11 to 14 V

J28-4 (M3) - J28-7 (GND)

G - W-B

M3 switch signal for seat memory switch

M3 switch on

Below 1 V

M3 switch off

11 to 14 V

J28-3 (M2) - J28-7 (GND)

R - W-B

M2 switch signal for seat memory switch

M2 switch on

Below 1 V

M2 switch off

11 to 14 V

J28-2 (M1) - J28-7 (GND)

BR - W-B

M1 switch signal for seat memory switch

M1 switch on

Below 1 V

M1 switch off

11 to 14 V

J28-1 (MM) - J28-7 (GND)

GR - W-B

SET switch signal for seat memory switch

SET switch on

Below 1 V

SET switch off

11 to 14 V

Z20-4 (H+) - Z20-12 (GND)

BR-W - BR

Mirror heater relay drive voltage

Mirror heater switch (rear window defogger switch) on

11 to 14 V

z20-7 (EC+) - z20-15 (EC-)

BR - B-L

Automatic glare-resistant EC mirror drive signal

Automatic glare-resistant EC mirror off → on

Below 1 V → 1.05 to 1.35 V

CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)

(a) Disconnect the J6 outer mirror control ECU assembly (front passenger door) connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J6-14 (BDR) - Body ground

GR - Body ground

+B power supply

Always

11 to 14 V

J6-6 (CPUB) - Body ground

LA-L - Body ground

+B power supply

Always

11 to 14 V

J6-5 (SIG) - Body ground

LA-B - Body ground

Ignition power supply

Engine switch off → on (IG)

Below 1 V → 11 to 14 V

J6-7 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the J6 outer mirror control ECU assembly (front passenger door) connector.

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

z19-3 (MR) - Body ground

G - Body ground

Power retract mirror motor drive voltage

Outer rear view mirror assembly (front passenger door) being retracted

11 to 14 V

Outer rear view mirror assembly (front passenger door) stopped

Below 1 V

z19-11 (MF) - Body ground

L - Body ground

Power retract mirror motor drive voltage

Outer rear view mirror assembly (front passenger door) returning

11 to 14 V

Outer rear view mirror assembly (front passenger door) stopped

Below 1 V

z19-1 (MV) - z19-10 (M+)

W - B

Vertical mirror motor drive voltage

Front passenger door mirror surface moving upward → stopped

11 to 14 V → Below 1 V

z19-10 (M+) - z19-1 (MV)

B - W

Vertical mirror motor drive voltage

Front passenger door mirror surface moving downward → stopped

11 to 14 V → Below 1 V

z19-10 (M+) - z19-9 (MH)

B - R

Horizontal mirror motor drive voltage

Front passenger door mirror surface moving right → stopped

11 to 14 V → Below 1 V

z19-9 (MH) - z19-10 (M+)

R - B

Horizontal mirror motor drive voltage

Front passenger door mirror surface moving left → stopped

11 to 14 V → Below 1 V

z19-5 (VC) - z19-14 (E1)

SB - GR

Mirror position sensor power supply

Engine switch on (IG)

4.55 to 5.45 V

Engine switch off

Below 1 V

z19-6 (VSSR) - J6-7 (GND)

V - W-B

Mirror position sensor signal

Engine switch on (IG)

0 to 5 V

z19-13 (HSSR) - J6-7 (GND)

LG - W-B

Mirror position sensor signal

Engine switch on (IG)

0 to 5 V

z19-4 (H+) - z19-12 (GND)

BR-W - BR

Mirror heater relay drive voltage

Mirror heater switch (rear window defogger switch) on

11 to 14 V

z19-7 (EC+) - z19-15 (EC-)

BR - B-L

Automatic glare-resistant EC mirror drive signal

Automatic glare-resistant EC mirror off → on

Below 1 V → 1.05 to 1.35 V

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

Click here

(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 connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

MB-31 (BECU) - Body ground

-

Battery power supply

Always

11 to 14 V

MB-32 (IG) - Body ground

-

Ignition power supply (IG signal)

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

MB-30 (ACC) - Body ground

-

Ignition power supply (ACC signal)

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

MB-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

(e) Connect the main body ECU (multiplex network body ECU) connectors.

(f) Measure the voltage according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

G38-7 (MIRB) - G38-9 (MIRE)

V - W

Mirror adjust switch signal

  • Engine switch on (ACC)
  • Mirror adjust switch up

Below 1.7 V

  • Engine switch on (ACC)
  • Mirror adjust switch right

Below 2.7 V

  • Engine switch on (ACC)
  • Mirror adjust switch down

Below 3.5 V

  • Engine switch on (ACC)
  • Mirror adjust switch left

Below 4 V

  • Engine switch on (ACC)
  • Mirror adjust switch off

3.8 to 5 V

G38-8 (MIRS) - G38-9 (MIRE)

GR - W

Mirror select switch signal

  • Engine switch on (ACC)
  • Mirror select switch L

Below 2 V

  • Engine switch on (ACC)
  • Mirror select switch R

Below 1 V

  • Engine switch on (ACC)
  • Mirror select switch off

3.8 to 5.0 V

G38-16 (RET) - G38-9 (MIRE)

B - W

Retractable outer mirror switch signal

  • Engine switch on (ACC)
  • Retractable outer mirror switch not in return position

Pulse generation (See waveform 1 or 2)

  • Engine switch on (ACC)
  • Retractable outer mirror switch in return position

Below 1 V

G38-6 (AMR) - G38-9 (MIRE)

BE - W

Retractable outer mirror switch signal

  • Engine switch on (ACC)
  • Retractable outer mirror switch not in retract position

Pulse generation (See waveform 1 or 2)

  • Engine switch on (ACC)
  • Retractable outer mirror switch in retract position

Below 1 V

(g) Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item

Content

Tester Connection

G38-16 (RET) or G38-6 (AMR) - G38-9 (MIRE)

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

  • Engine switch on (ACC)
  • Retractable outer mirror switch not in return position

(h) Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item

Content

Tester Connection

G38-16 (RET) or G38-6 (AMR) - G38-9 (MIRE)

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

  • Engine switch on (ACC)
  • Retractable outer mirror switch not in retract position

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