Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the G35 air conditioning amplifier assembly 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

G35-2 (IG+) - Body ground

LA-GR - Body ground

IG power supply

Power switch off

Below 1 V

G35-2 (IG+) - Body ground

LA-GR - Body ground

IG power supply

Power switch on (IG)

11 to 14 V

G35-4 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the G35 air conditioning amplifier assembly connector.

(d) Measure the voltage and check for pulses generation according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G37-16 (SHP+) - G35-4 (GND)

LG - W-B

Front seat heater control signal

  • Power switch on (IG)
  • Seat heater switch (radio and display receiver assembly) on (LO)

    (heater position)

Below 1 V

G37-15 (SHD+) - G35-4 (GND)

BE - W-B

Front seat heater control signal

  • Power switch on (IG)
  • Seat heater switch (radio and display receiver assembly) on (LO)

    (heater position)

Below 1 V

G37-27 (HTR2) - G35-4 (GND)

L - W-B

Rear seat heater control signal

  • Power switch on (IG)
  • Rear seat heater switch (LH) on

Below 1 V

G36-7 (HTR1) - G35-4 (GND)

W - W-B

Rear seat heater control signal

  • Power switch on (IG)
  • Rear seat heater switch (RH) on

Below 1 V

G35-14 (LIN1) - Body ground

LG - Body ground

Front seat heater switch signal

Power switch on (IG)

Pulse generation

G36-28 (SW 2) - Body ground

G - Body ground

Rear seat heater switch signal

  • Power switch on (IG)
  • Rear seat heater switch (LH) on

11 to 14 V

G36-26 (SW 1) - Body ground

R - Body ground

Rear seat heater switch signal

  • Power switch on (IG)
  • Rear seat heater switch (RH) on

11 to 14 V

CHECK SEAT HEATER SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the G20 seat heater switch (radio and display receiver assembly) 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

G20-2 (IG+) - Body ground

GR - Body ground

IG power supply

Power switch off

Below 1 V

G20-2 (IG+) - Body ground

GR- Body ground

IG power supply

Power switch on (IG)

11 to 14 V

G20-6 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the G20 seat heater switch (radio and display receiver assembly) connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G20-8 (LIN1) - Body ground

LG - Body ground

Seat heater switch signal

Power switch on (IG)

Pulse generation

    System Diagram

    Seat Memory Switch

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