Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM100000001F1IY
Model Year Start: 2019 Model: Camry HV Prod Date Range: [09/2018 - 09/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: TERMINALS OF ECU; 2019 MY Camry HV [09/2018 - 09/2019]

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

HINT:

  • Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.
  • Make sure to wait at least 2 minutes after turning the ignition switch off before performing an ECU terminal inspection.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

K54-1 (B) - K54-4 (GND)

LA-B - W-B

Power source (Back-up)

Power switch off

11 to 14 V

K54-2 (IG+) - K54-4 (GND)

LA-GR - W-B

Power source (IG)

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

K54-4 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 V

K54-6 (BLW) - K54-4 (GND)

LG - W-B

Blower motor speed control signal
  • Power switch on (IG)
  • Blower switch: LO

Pulse generation

(See waveform 1)

K54-11 (CANH) - K54-12 (CANL)

SB - W

CAN communication system

CAN communication is performed

Pulse generation

K54-14 (LIN1) - K54-4 (GND)*

BE - W-B

LIN communication signal

Power switch on (IG)

Pulse generation

(See waveform 2)

K55-1 (SG-1) - Body ground

LG - Body ground

Ground for cooler (room temp. sensor) thermistor

Always

Below 1 V

K55-2 (SG-2) - Body ground

W - Body ground

Ground for thermistor assembly

Always

Below 1 V

K55-3 (SG-4) - Body ground

L - Body ground

Ground for air conditioner pressure sensor

Always

Below 1 V

K55-6 (S5-3) - K55-3 (SG-4)

GR - L

Power supply for air conditioner pressure sensor

Power switch on (IG)

4.75 to 5.25 V

Power switch off

Below 1 V

K55-13 (TAM) - K55-2 (SG-2)

R - W

Thermistor assembly signal
  • Power switch on (IG)
  • Ambient temperature: 25°C (77°F)

1.05 to 1.45 V
  • Power switch on (IG)
  • Ambient temperature: 40°C (104°F)

0.64 to 0.87 V

K55-14 (TR) - K55-1 (SG-1)

GR - LG

Cooler (room temp. sensor) thermistor signal
  • Power switch on (IG)
  • Cabin temperature: 25°C (77°F)

1.05 to 1.45 V
  • Power switch on (IG)
  • Cabin temperature: 40°C (104°F)

0.64 to 0.87 V

K55-20 (ECOS) - K54-4 (GND)

W - W-B

ECO switch assembly (Electric parking brake switch assembly) signal
  • Power switch on (IG)
  • ECO switch assembly (Electric parking brake switch assembly): off

11 to 14 V
  • Power switch on (IG)
  • ECO switch assembly (Electric parking brake switch assembly): On

Below 1 V

K55-24 (PRE) - K55-3 (SG-4)

W - L

Air conditioner pressure sensor signal
  • Power switch on (READY)
  • Air conditioning system operating
  • for HFC-134a(R134a):

    Refrigerant pressure: Abnormal pressure (more than 3025 kPaG (30.8 kgf/cm2, 439 psi))

  • for HFO-1234yf(R1234yf):

    Refrigerant pressure: Abnormal pressure (more than 2812 kPaG (28.7 kgf/cm2, 408 psi))

4.61 V or higher
  • Power switch on (READY)
  • Air conditioning system operating
  • for HFC-134a(R134a):

    Refrigerant pressure: Abnormal pressure (less than 176 kPaG (1.8 kgf/cm2, 26 psi))

  • for HFO-1234yf(R1234yf):

    Refrigerant pressure: Abnormal pressure (less than 196 kPaG (2.0 kgf/cm2, 28 psi))

Below 0.74 V
  • Power switch on (READY)
  • Air conditioning system operating
  • for HFC-134a(R134a):

    Refrigerant pressure: Normal pressure (less than 3025 kPaG (30.8 kgf/cm2, 439 psi) and more than 176 kPaG (1.8 kgf/cm2, 26 psi))

  • for HFO-1234yf(R1234yf):

    Refrigerant pressure: Normal pressure (less than 2812 kPaG (28.7 kgf/cm2, 408 psi) and more than 196 kPaG (2.0 kgf/cm2, 28 psi))

0.74 to 4.61 V

z28-2 (BUS G) - Body ground

-

Ground for BUS IC

Always

Below 1 V

z28-3 (BUS) - z28-2 (BUS G)

-

BUS IC control signal

Power switch on (IG)

Pulse generation

(See waveform 3)

z28-4 (B BUS) - z28-2 (BUS G)

-

Power supply for BUS IC

Power switch off

11 to 14 V

z28-5 (SG) - Body ground

GR - Body ground

Ground for No. 1 cooler thermistor

Always

Below 1 V

z28-6 (TE) - z28-5 (SG)

GR - GR

No. 1 cooler thermistor signal
  • Power switch on (IG)
  • Evaporator temperature: 0°C (32°F)

1.7 to 2.1 V
  • Power switch on (IG)
  • Evaporator temperature: 15°C (59°F)

0.9 to 1.3 V
  • *: for 7 Inch Display

(a) Waveform 1:

Item

Content

Terminal No.

K54-6 (BLW) - K54-4 (GND)

Tool Setting

2 V/DIV., 1 ms./DIV.

Condition
  • Power switch on (IG)
  • Blower switch: LO

(b) Waveform 2:

Item

Content

Terminal No.

K54-14 (LIN1) - K54-4 (GND)

Tool Setting

2 V/DIV., 20 ms./DIV.

Condition

Power switch on (IG)

(c) Waveform 3:

Item

Content

Terminal No.

z28-3 (BUS) - z28-2 (BUS G)

Tool Setting

2 V/DIV., 2 ms./DIV.

Condition

Power switch on (IG)

CHECK AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY) (for 8 Inch Display)

HINT:

Check from the rear of the connector while it is connected to the air conditioning control panel (radio and display receiver assembly).

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

h1-2 (IG+) - h1-6 (GND)

SB - W-B

Power source (IG)

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V

h1-3 (+B) - h1-6 (GND)

G - W-B

Power source (Back-up)

Power switch off

11 to 14 V

h1-6 (GND) - Body ground

W-B - Body ground

Ground for air conditioning control panel (radio and display receiver assembly)

Always

Below 1 V

h1-10 (ACC) - h1-6 (GND)

R - W-B

Power source (ACC)

Power switch off

Below 1 V

Power switch on (ACC)

11 to 14 V

h1-11 (ILL+) - Body ground

W - Body ground

Illumination signal

Light control switch in off position

Below 1 V

Light control switch in tail or head position

11 to 14 V

h1-15 (ILL-) - Body ground

L - Body ground

Illumination signal

Always

Below 1 V

CHECK AIR CONDITIONING CONTROL ASSEMBLY (for 7 Inch Display)

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

K26-2 (IG+) - K26-6 (GND)

GR - W-B

Power source (IG)

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V

K26-6 (GND) - Body ground

W-B - Body ground

Ground for air conditioning control assembly

Always

Below 1 V

K26-9 (LIN1) - Body ground

LG - Body ground

LIN communication signal

Power switch on (IG)

Pulse generation

K26-11 (ILL+) - Body ground

W - Body ground

Illumination signal

Light control switch in off position

Below 1 V

Light control switch in tail or head position

11 to 14 V

K26-15 (ILL-) - Body ground

B - Body ground

Illumination signal

Always

Below 1 V

(a) Waveform:

Item

Content

Terminal No.

K26-9 (LIN1) - Body ground

Tool Setting

2 V/DIV., 20 ms./DIV.

Condition

Power switch on (IG)

HYBRID VEHICLE CONTROL ECU ASSEMBLY

for Nickel Metal Hydride Battery: Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): TERMINALS OF ECU

for Lithium-ion Battery: Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): TERMINALS OF ECU