Toyota Corolla Cross: Air Conditioning Amplifier Communication Stop Mode
DESCRIPTION
Detection Item
|
Symptom
|
Trouble Area
|
Air Conditioning Amplifier Communication Stop Mode
|
Communication stop for "Air Conditioning Amplifier" is indicated on the
"Communication Bus Check" screen of the GTS.
Click here
|
- Air conditioning amplifier assembly branch line or connector
- Power source circuit of air conditioning amplifier assembly
- Air conditioning amplifier assembly ground circuit
- Air conditioning amplifier assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic
laws.
NOTICE:
- Because the order of diagnosis is important to allow correct diagnosis,
make sure to begin troubleshooting using How to Proceed with Troubleshooting
when CAN communication system related DTCs are output.
Click here
- Before measuring the resistance of the CAN bus, turn the ignition switch
off and leave the vehicle for 1 minute or more without operating the key or
any switches, or opening or closing the doors. After that, disconnect the cable
from the negative (-) auxiliary battery terminal and leave the vehicle for 1
minute or more before measuring the resistance.
- After the ignition switch is turned off, there may be a waiting time before
disconnecting the negative (-) auxiliary battery terminal.
Click here
- When disconnecting and reconnecting the auxiliary battery.
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic
learning function that completes learning when the respective system is used.
Click here
- Some parts must be initialized and set when replacing or removing and installing
parts.
Click here
- After performing repairs, perform the DTC check procedure and confirm that
the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute
or more. Then operate the suspected malfunctioning system and drive the vehicle
at 60 km/h (37 mph) or more for 5 minutes or more.
- After the repair, perform the CAN bus check and check that all the ECUs
and sensors connected to the CAN communication system are displayed as normal.
Click here
- Inspect the fuses for circuits related to this system before performing
the following procedure.
HINT:
- Before disconnecting related connectors for inspection, push in on each
connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector
body are not cracked, deformed or corroded.
PROCEDURE
1.
|
CHECK FOR OPEN IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY
BRANCH LINE)
|
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I49-2 (CANH) - I49-1 (CANL)
|
Cable disconnected from negative (-) auxiliary battery terminal
|
54 to 69 Ω
|
|
|
*a
|
Rear view of wire harness connector
(to Air Conditioning Amplifier Assembly)
|
|
|
NG |
|
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (AIR CONDITIONING AMPLIFIER
ASSEMBLY)
|
OK |
|
|
2.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I49-17 (GND) - Body ground
|
Cable disconnected from negative (-) auxiliary battery terminal
|
Below 1 Ω
|
|
|
*a
|
Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)
|
|
|
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
I49-5 (B) - Body ground
|
Ignition switch off
|
11 to 14 V
|
I49-6 (IG+) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
OK |
|
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
|
READ NEXT:
DESCRIPTION
Detection Item
Symptom
Trouble Area
Power Steering ECU Communication Stop Mode
Communication stop for "Power Steering (EP
DESCRIPTION
Detection Item
Symptom
Trouble Area
Steering Angle Sensor Communication Stop Mode
Communication stop for "Spiral cable (S
DESCRIPTION
Detection Item
Symptom
Trouble Area
ECM Communication Stop Mode
Communication stop for "ECM (Engine)" is indicated o
SEE MORE:
DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs are stored when the transmission fluid temperature sensor output is abnormal. The cause of this malfunction may be one of the following: Motor generator control ECU (MG ECU) internal malfunction
Motor generator control ECU (MG ECU) malfunction
DESCRIPTION A battery current sensor, which is mounted on the positive cable side of each HV battery junction block assembly, detects the current flowing to or from the battery pack. The battery current sensor sends a voltage, which varies between 0 and 5 V in proportion to the amperage, to the IB0