Toyota Corolla Cross: Lost Communication with Front Panel LIN Missing Message (B14B287)
DESCRIPTION
The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.
If a malfunction occurs in the LIN communication system, the air conditioning amplifier assembly will not operate, even if the air conditioning control assembly is operated.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Memory |
|---|---|---|---|---|
| B14B287 |
Lost Communication with Front Panel LIN Missing Message |
Diagnosis Condition:
Malfunction Status:
Detection Time:
|
| Memorized |
|
Vehicle Condition | |||
|---|---|---|---|
|
Pattern 1 | Pattern 2 | ||
|
Diagnosis Condition | Ignition switch ON |
○ | ○ |
|
Malfunction | Error communication with air conditioning control assembly |
○ | - |
|
Lost communication with air conditioning control assembly |
- | ○ | |
|
Detection Time | Continuously for 10 seconds or more |
Continuously for 10 seconds or more | |
|
Trip Count | 1 trip |
1 trip | |
HINT:
If the conditions of either of these patterns are detected, a DTC will be stored.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - IG POWER SOURCE) |
| (a) Disconnect the I37 air conditioning control assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Switch Condition |
Specified Condition |
|---|---|---|
|
I37-9 (IG+) - Body ground |
Ignition switch ON | 11 to 14 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
| 2. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
I37-13 (GND) - Body ground |
Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the I49 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
I37-7 (LIN1) - I49-7 (LIN1) |
Always | Below 1 Ω |
|
I37-7 (LIN1) or I49-7 (LIN1) - Other terminals and body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Connect the I49 air conditioning amplifier assembly connector.
| (b) Using an oscilloscope, check the waveform.
OK: Waveform is similar to that shown in the illustration. |
|
| NG | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
| 5. |
INSPECT AIR CONDITIONING CONTROL ASSEMBLY |
| (a) Connect the air conditioning control assembly connector. |
|
(b) Using an oscilloscope, check the waveform.
|
Item | Content |
|---|---|
|
Terminal No. | I37-7 (LIN1) - Body ground |
|
Tool Setting | 2 V/DIV., 20 ms./DIV. |
|
Condition | Ignition switch ON |
OK:
Waveform is similar to that shown in the illustration.
| OK | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| NG | | REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
READ NEXT:
Ambient Temperature Sensor Circuit Short to Ground (P007011)
DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is conne
Ambient Temperature Sensor Circuit Short to Battery or Open (P007015)
DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is conne
Refrigerant Pressure Sensor Circuit Short to Ground (P053011)
DESCRIPTION The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier
SEE MORE:
Pressure Control Solenoid "A" Circuit Short to Ground or Open (P074514)
DESCRIPTION
Refer to DTC P074512.
Click here
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
MIL
Memory
Note
P074514
Pressure Control Solenoid "A" Circuit Short to Grou
Installation
INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION)
Procedure Part Name Code
1 LEAK DETECTION PUMP SUB-ASSEMBLY
-
- -
2 INSTALL CHARCOAL WITH OUTLET HOSE CANISTER ASSEMBLY
77730B -
- -
3 FUEL
