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 | |||
|
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 |
Rack and pinion power steering gear assembly (power steering ECU) |
Loading control level signal |
CAN |
| Rack and pinion power steering gear assembly (power steering ECU) |
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 | |||
|
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 |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
Air conditioning control assembly |
Independent control A/C information signal |
LIN |
| 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 | |||
|
Recirculation/fresh switch operation signal | |||
|
Air conditioning control assembly |
Air conditioning amplifier assembly |
Entire front panel display instruction signal |
LIN |
| Blower level display instruction signal | |||
|
Recirculation/fresh display instruction signal | |||
|
Air outlet display instruction signal | |||
|
Rear defogger display instruction signal | |||
|
Set temperature display instruction signal | |||
|
Dimmer signal | |||
|
A/C display instruction signal |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly |
No. 1 air conditioning radiator damper servo sub-assembly |
Damper position signal |
LIN |
| No. 1 blower damper servo sub-assembly | |||
|
No. 1 air conditioning radiator damper servo sub-assembly |
Air conditioning amplifier assembly | ||
|
No. 1 blower damper servo sub-assembly |
|
Receiver | Sender |
Signal | Communication Line |
|---|---|---|---|
|
Air conditioning amplifier assembly | Thermistor assembly |
Sensor value signal |
Direct line |
| Air conditioner pressure sensor | |||
|
No. 1 cooler thermistor | |||
|
Blower motor with fan sub-assembly |
Air conditioning amplifier assembly |
Drive signal | |
| Compressor assembly with pulley (compressor solenoid) |
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 Manual Air Conditioning System)
(a) Customizing with the Techstream.
NOTICE:
When the customer requests a change in a function, first ma
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:
Precaution
PRECAUTION
CAUTION:
Never perform work on fuel system components near any possible ignition sources.
Vaporized fuel could ignite, resulting in a serious accident.
Do not perform work on fuel system components without first disconnecting the cable from the negative (-) battery termin
Multi-axis Acceleration Sensor Module "A" Component Internal Failure (C052096)
DESCRIPTION The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication. These DTCs may be stor
