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Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Terminals Of Ecu

TERMINALS OF ECU

1. AIR CONDITIONING AMPLIFIER ASSEMBLY

HINT:

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A35-1 (TAM) - A36-28 (SG-8)

W - LG

Ambient temperature sensor signal
  • Ignition switch ON
  • Ambient temperature: 25°C (77°F)

1.35 to 1.75 V
  • Ignition switch ON
  • Ambient temperature: 40°C (104°F)

0.9 to 1.2 V

A35-2 (PRE) - A36-10 (GND)

V - W-B

Air conditioner pressure sensor signal
  • Engine running
  • Air conditioning system operating
  • Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.8 kgf/cm2, 439 psi))

4.71 V or higher
  • Engine running
  • Air conditioning system operating
  • Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm2, 26 psi))

Below 0.74 V
  • Engine running
  • Air conditioning system operating
  • Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 26 psi))

0.74 to 4.71 V

A35-3 (TPO) - A35-19 (SG-6)

B - L

Mode damper position sensor signal
  • Ignition switch ON
  • Mode switch: DEF

4.43 to 4.53 V
  • Ignition switch ON
  • Mode switch: FACE

0.47 to 0.57 V

A35-4 (TPR) - A35-18 (SG-5)

G - GR

Air mix damper position sensor (for front passenger side) signal
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX HOT

4.45 to 4.55 V
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX COOL

0.45 to 0.55 V

A35-5 (TPL) - A35-17 (SG-4)

V - R

Air mix damper position sensor (for driver side) signal
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX HOT

4.45 to 4.55 V
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX COOL

0.45 to 0.55 V

A35-6 (TPI) - A35-16 (SG-3)

LG -V

Air inlet damper position sensor signal
  • Ignition switch ON
  • Recirculation/Fresh switch: Fresh

1.63 to 1.73 V
  • Ignition switch ON
  • Recirculation/Fresh switch: Recirculation

3.27 to 3.37 V

A35-7 (LOCK) - A36-10 (GND)

G - W-B

A/C lock sensor signal
  • Engine running
  • Blower switch: LO
  • A/C switch: on

Pulse generation

(See waveform 1)

A35-10 (MGC) - A36-10 (GND)

G - W-B

Magnetic clutch operation signal
  • Engine running
  • Blower switch: LO
  • A/C switch: off

11 to 14 V
  • Engine running
  • Blower switch: LO
  • A/C switch: on

Below 1 V

A35-11 (AMDH) - A36-10 (GND)

BE - W-B

Air mix damper servo motor (for driver side) operating signal
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX COOL to MAX HOT

11 to 14 V

(Servo motor operating)

A35-12 (AMDC) - A36-10 (GND)

SB - W-B

Air mix damper servo motor (for driver side) operating signal
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX HOT to MAX COOL

11 to 14 V

(Servo motor operating)

A35-13 (AMPH) - A36-10 (GND)

Y - W-B

Air mix damper servo motor (for front passenger side) operating signal
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX COOL to MAX HOT

11 to 14 V (Servo motor

(Servo motor operating)

A35-14 (AMPC) - A36-10 (GND)

W - W-B

Air mix damper servo motor (for front passenger side) operating signal
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX HOT to MAX COOL

11 to 14 V

(Servo motor operating)

A35-16 (SG-3) - Body ground

V - Body ground

Ground for air inlet damper position sensor

Always

Below 1 Ω

A35-17 (SG-4) - Body ground

R - Body ground

Ground for air mix damper position sensor (for driver side)

Always

Below 1 Ω

A35-18 (SG-5) - Body ground

GR - Body ground

Ground for air mix damper position sensor (for front passenger side)

Always

Below 1 Ω

A35-19 (SG-6) - Body ground

L - Body ground

Ground for mode damper position sensor

Always

Below 1 Ω

A35-22 (AC1) - A36-10 (GND)

BE - W-B

Compressor operation signal
  • Ignition switch ON
  • A/C switch: off

11 to 14 V
  • Ignition switch ON
  • A/C switch: on

Below 1 V

A35-25 (AIF) - A36-10 (GND)

P - W-B

Air inlet damper servo motor operating signal
  • Ignition switch ON
  • Recirculation/Fresh switch: Recirculation to Fresh

11 to 14 V

(Servo motor operating)

A35-26 (AIR) - A36-10 (GND)

B - W-B

Air inlet damper servo motor operating signal
  • Ignition switch ON
  • Recirculation/Fresh switch: Fresh to Recirculation

11 to 14 V

(Servo motor operating)

A35-27 (AOF) - A36-10 (GND)

LG - W-B

Mode damper servo motor operating signal
  • Ignition switch ON
  • Mode switch: DEF to FACE

11 to 14 V

(Servo motor operating)

A35-28 (AOD) - A36-10 (GND)

R - W-B

Mode damper servo motor operating signal
  • Ignition switch ON
  • Mode switch: FACE to DEF

11 to 14 V

(Servo motor operating)

A35-30 (S5-5) - A36-10 (GND)

G - W-B

Power supply for mode damper position sensor

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V

A36-1 (IG+) - A36-10 (GND)

GR - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

A36-4 (ACT) - A36-10 (GND)

R - W-B

Compressor operation signal
  • Ignition switch ON
  • A/C switch: off

Below 1 V
  • Ignition switch ON
  • A/C switch: on

4.75 to 5.25 V

A36-7 (HRLY) - A36-10 (GND)

Y - W-B

HTR relay operation signal
  • Ignition switch ON
  • Blower switch: off

11 to 14 V
  • Ignition switch ON
  • Blower switch: LO

Below 1 V

A36-8 (CANH)

L

CAN communication system

-

-

A36-9 (CANL)

W

CAN communication system

-

-

A36-10 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 Ω

A36-11 (LIN1) - A36-10 (GND)

SB - W-B

LIN communication signal

Ignition switch ON

Pulse generation

A36-12 (S5-1) - A36-10 (GND)

SB - W-B

Power supply for air conditioner pressure sensor

Ignition switch off

Below 1 V

Ignition switch ON

4.5 to 5.5 V

A36-13 (S5-2) - A36-10 (GND)

Y - W-B

Power supply for air inlet damper position sensor

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V

A36-14 (S5-3) - A36-10 (GND)

Y - W-B

Power supply for air mix damper position sensor (for driver side)

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V

A36-15 (TE) - A36-27 (SG-7)

B - GR

Evaporator temperature sensor signal
  • Ignition switch ON
  • Evaporator temperature: 0°C (32°F)

1.7 to 2.1 V
  • Ignition switch ON
  • Evaporator temperature: 15°C (59°F)

0.9 to 1.3 V

A36-16 (TR) - A36-26 (SG-1)

R - BR

Room temperature sensor signal
  • Ignition switch ON
  • Cabin temperature: 25°C (77°F)

1.8 to 2.2 V
  • Ignition switch on (IG)
  • Cabin temperature: 40°C (104°F)

1.2 to 1.6 V

A36-17 (B) - A36-10 (GND)

LG - W-B

Power source (Back-up)

Always

11 to 14 V

A36-19 (PTC1) - A36-10 (GND)*1

V - W-B

Quick heater operation signal
  • Engine running
  • Blower switch off
  • Temperature settings: MAX HOT
  • Engine coolant temperature 65°C or lower
  • Ambient temperature 10°C or lower

11 to 14 V
  • Engine running
  • Blower switch on
  • Temperature settings: MAX HOT
  • Engine coolant temperature 65°C or lower
  • Ambient temperature 10°C or lower

Below 1 V

A36-20 (PTC2) - A36-10 (GND)*1

W - W-B

Quick heater operation signal
  • Engine running
  • Blower switch off
  • Temperature settings: MAX HOT
  • Engine coolant temperature 65°C or lower
  • Ambient temperature 10°C or lower

11 to 14 V
  • Engine running
  • Blower switch on
  • Temperature settings: MAX HOT
  • Engine coolant temperature 65°C or lower
  • Ambient temperature 10°C or lower

Below 1 V

A36-21 (PTC3) - A36-10 (GND)*1

P - W-B

Quick heater operation signal
  • Engine running
  • Blower switch off
  • Temperature settings: MAX HOT
  • Engine coolant temperature 65°C or lower
  • Ambient temperature 10°C or lower

11 to 14 V
  • Engine running
  • Blower switch on
  • Temperature settings: MAX HOT
  • Engine coolant temperature 65°C or lower
  • Ambient temperature 10°C or lower

Below 1 V

A36-23 (BLW) - A36-10 (GND)

BE - W-B

Blower motor speed control signal
  • Ignition switch ON
  • Blower switch: LO

Pulse generation

(See waveform 2)

A36-26 (SG-1) - Body ground

BR - Body ground

Ground for room temperature sensor

Always

Below 1 Ω

A36-27 (SG-7) - Body ground

GR - Body ground

Ground for evaporator temperature sensor

Always

Below 1 Ω

A36-28 (SG-8) - Body ground

LG - Body ground

Ground for air conditioner pressure sensor, ambient temperature sensor, A/C lock sensor

Always

Below 1 Ω

A36-29 (S5-4) - A36-10 (GND)

R - W-B

Power supply for air mix damper position sensor (for front passenger side)

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V
  • *1: w/ PTC Heater

(a) Waveform 1:

Item

Content

Terminal No.

A35-7 (LOCK) - A36-10 (GND)

Tool Setting

200 mV/DIV., 10 ms./DIV.

Vehicle Condition
  • Engine running
  • Blower switch: LO
  • A/C switch: on

(b) Waveform 2:

Item

Content

Terminal No.

A36-23 (BLW) - A36-10 (GND)

Tool Setting

1 V/DIV., 500 μs./DIV.

Vehicle Condition
  • Ignition switch ON
  • Blower switch: LO

2. AIR CONDITIONING CONTROL ASSEMBLY

HINT:

HINT:

Check from the rear of the connector while it is connected to the air conditioning control assembly.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A33-8 (IG+) - A33-1 (GND)

LG - W-B

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

A33-1 (GND) - Body ground

W-B - Body ground

Ground for air conditioning control assembly

Always

Below 1 Ω

A33-2 (STX) - A33-1 (GND)

SB - W-B

LIN communication signal

Ignition switch ON

Pulse generation

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