Toyota Camry (XV70): System Description
SYSTEM DESCRIPTION
COMMUNICATION SYSTEM FUNCTION
(a) The air conditioning amplifier assembly communicates with each ECU via CAN communication and LIN communication. Additionally, the air conditioning amplifier assembly sends operation signals to each damper servo motor and receives damper position information and sensor information from the damper servo motors and No. 1 cooler thermistor through the air conditioning harness assembly.
Air Conditioning Amplifier Assembly <> Airbag Sensor Assembly|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Airbag sensor assembly |
Front passenger seat occupant status signal |
CAN |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Main body ECU (multiplex network body ECU) |
Auto dimmer signal |
CAN |
| Front passenger door courtesy switch signal | |||
|
Rear right door courtesy switch signal | |||
|
Rear left door courtesy switch signal | |||
|
High beam headlight request signal | |||
|
Low beam headlight request signal | |||
|
Destination symbol signal | |||
|
Country code signal | |||
|
Steering wheel signal | |||
|
Solar data (R) signal | |||
|
Solar data (L) signal | |||
|
Main body ECU (multiplex network body ECU) |
Air conditioning amplifier assembly |
Rear defogger drive request signal |
CAN |
| Ambient temperature display signal |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Power steering ECU (rack and pinion power steering gear assembly) |
Loading control level signal |
CAN |
| Power steering ECU (rack and pinion power steering gear assembly) |
Air conditioning amplifier assembly |
Ambient temperature display signal |
CAN |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Combination meter assembly |
Vehicle speed signal (meter to other) |
CAN |
| Front passenger presence signal | |||
|
Combination meter assembly |
Air conditioning amplifier assembly |
Ambient temperature display signal |
CAN |
| Ambient temperature display whole number/decimal (0/0.5°C) signal | |||
|
A/C load limitation warning signal |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
ECM | Drive mode select signal |
CAN |
| Engine type information signal | |||
|
Engine RPM data signal | |||
|
Alternative field duty value signal | |||
|
Engine coolant temperature signal | |||
|
A/C control cut-off signal | |||
|
Variable control inhibition signal | |||
|
Compulsory internal air circulation at high coolant temperature command signal | |||
|
Flag for water stop valve close condition signal | |||
|
Heater core flow rate signal | |||
|
ECM | Air conditioning amplifier assembly |
Idle up request signal |
CAN |
| Heater idle up request signal | |||
|
ECO switch information signal* | |||
|
Charging control inhibit signal | |||
|
Prior A/C control request signal | |||
|
Acceleration cut inhibit signal | |||
|
Generator control inhibit signal | |||
|
Request control by refrigerant signal | |||
|
Ambient temperature before correction signal | |||
|
Evaporator temperature sensor signal | |||
|
Variable compressor solenoid current signal | |||
|
Air conditioner pressure sensor signal | |||
|
Rear defogger drive request signal | |||
|
Ambient temperature display signal | |||
|
Heater priority request signal | |||
|
FSV close request signal | |||
|
Minimum heater flow request signal |
- *: for Dual Type
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
ECM | Drive mode select signal |
CAN |
| Engine type information signal | |||
|
Engine RPM data signal | |||
|
Alternative field duty value signal | |||
|
Engine coolant temperature signal | |||
|
A/C control cut-off signal | |||
|
Variable control inhibition signal | |||
|
Compulsory internal air circulation at high coolant temperature command signal | |||
|
ECM | Air conditioning amplifier assembly |
Magnet clutch request signal |
CAN |
| Idle up request signal | |||
|
ECO switch information signal | |||
|
Heater idle up request signal | |||
|
Charging control inhibit signal | |||
|
Prior A/C control request signal | |||
|
Acceleration cut inhibit signal | |||
|
Generator control inhibit signal | |||
|
Request control by refrigerant signal | |||
|
Ambient temperature before correction signal | |||
|
Evaporator temperature sensor signal | |||
|
Variable compressor solenoid current signal | |||
|
Air conditioner pressure sensor signal | |||
|
Rear defogger drive request signal | |||
|
Ambient temperature display signal |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
DCM (telematics transceiver) |
Remote engine start system control signal |
CAN |
| Defogger control signal | |||
|
Air conditioner control signal | |||
|
DCM (telematics transceiver) |
Air conditioning amplifier assembly |
Drive recorder signal |
CAN |
| Front defroster indicator signal | |||
|
A/C indicator signal | |||
|
Driver side temperature display signal | |||
|
In-vehicle temperature signal | |||
|
Ambient temperature display signal | |||
|
A/C control state signal |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Air conditioning control assembly |
Independent control A/C information signal |
LIN |
| AUTO switch operation signal | |||
|
OFF switch operation signal | |||
|
A/C switch operation signal | |||
|
Blower switch operation signal | |||
|
Air outlet switch operation signal | |||
|
Front defroster switch operation signal | |||
|
Rear defogger switch operation signal | |||
|
SYNC switch operation signal* | |||
|
Driver side set temperature switch operation signal | |||
|
Front passenger side set temperature switch operation signal* | |||
|
Recirculation/fresh switch operation signal | |||
|
Air conditioning control assembly |
Air conditioning amplifier assembly |
ECO display instruction signal* |
LIN |
| Entire front panel display instruction signal | |||
|
AUTO display instruction signal | |||
|
Blower level display instruction signal | |||
|
Recirculation/fresh display instruction signal | |||
|
Air outlet display instruction signal | |||
|
Rear defogger display instruction signal | |||
|
SYNC display instruction signal* | |||
|
Driver side set temperature display instruction signal | |||
|
Front passenger side set temperature display instruction signal* | |||
|
Dimmer signal | |||
|
A/C display instruction signal |
- *: for Dual Type
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
No. 1 air conditioning radiator damper servo sub-assembly |
Damper position signal |
LIN |
| No. 2 air conditioning radiator damper servo sub-assembly* | |||
|
No. 1 blower damper servo sub-assembly | |||
|
No. 1 air conditioning radiator damper servo sub-assembly |
Air conditioning amplifier assembly | ||
|
No. 2 air conditioning radiator damper servo sub-assembly* | |||
|
No. 1 blower damper servo sub-assembly |
- *: w/ Rear Center Register
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Cooler (room temp. sensor) thermistor |
Sensor value signal |
Direct line |
| Thermistor assembly | |||
|
Air conditioner pressure sensor | |||
|
No. 1 cooler thermistor | |||
|
Magnet clutch assembly*2 |
Operation signal | ||
|
ECO switch assembly (electric parking brake switch assembly)*3 |
ECO switch signal | ||
|
Blower motor with fan sub-assembly |
Air conditioning amplifier assembly |
Drive signal | |
|
Compressor assembly with pulley (compressor solenoid)*1 | |||
|
Cooler compressor assembly (compressor solenoid)*2 | |||
|
Magnetic clutch relay*2 |
- *1: for A25A-FKS
- *2: for 2GR-FKS
- *3: for Dual Type
READ NEXT:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the air conditioning system.
*: Use the Techstream.
PROCEDURE
1. VEHICLE BROUGHT TO WORKSHOP
NEX
Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System)
(a) Customizing with the Techstream.
NOTICE:
When the customer requests a change in a function, first
Initialization
INITIALIZATION INITIALIZATION SERVO MOTOR (a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON. (c) Press the OFF switch. (d) Turn the Techstream on.
(e) Enter the following me
SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT
NOTICE:
Immediately after installing the brake pads, the braking performance may be reduced. Always perform a road test in a safe place while paying attention to the surroundings.
After replacing the front disc brake pads, the brake pedal may feel soft due
Mass or Volume Air Flow Sensor "A" Circuit Short to Battery (P010012,P010014)
DESCRIPTION The mass air flow meter sub-assembly is a sensor that measures the intake air volume using the following built-in components:
By-pass duct (allows some of the intake air to flow past a silicon chip sensor)
Silicon chip sensor (uses a heater control bridge circuit and temperatur
